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Mandal S, Gatti F, Bindech O, Marquardt R, Tremblay JC. Stochastic Multi Configuration Time-Dependent Hartree for Dissipative Quantum Dynamics with Strong Intramolecular Coupling. J Chem Phys 2022; 157:144105. [DOI: 10.1063/5.0105308] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In this article, we explore the dissipation dynamics of a strongly coupled multidimensional system in contact with a Markovian bath following a system-bath approach. We use in this endeavour the recently developed stochastic Multi-Configuration Time-Dependent Hartree approach within the Monte Carlo wave packet formalism [J. Chem. Phys. 156, 094109 (2022)]. The method proved to yield thermalized ensembles of wave packets when intramolecular coupling is weak. To treat strongly coupled systems, new Lindblad dissipative operators are constructed as linear combinations of the system coordinates and associated momenta. These are obtained by an unitary transformation to a normal mode representation, which reduces intermode coupling up to second order. Additionally, we use combinations of generalized raising/lowering operators to enforce the Boltzmann distribution in the dissipation operators, which yield perfect thermalization in the harmonic limit. The two ansatz are tested using a model two-dimensional hamiltonian parameterized to disentangle the effects of intramolecular potential coupling, of strong mode mixing observed in Fermi resonances, and of anharmonicity.
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Affiliation(s)
- Souvik Mandal
- Laboratoire de Physique et Chimie Théoriques, Universite de Lorraine - Site de Metz, France
| | - Fabien Gatti
- Institut des Sciences Moléculaires d'Orsay, Paris-Saclay University, France
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2
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Zhang Q, Bornhauser P, Knopp G, Radi P, Harmant G, Marquardt R. Experimental and theoretical investigation of excited g-symmetry states of Cu2. Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2022.139822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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3
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Jin J, Zhang Q, Bornhauser P, Knopp G, Marquardt R, Radi PP. Rovibrational investigation of a new high-lying 0 u + state of Cu 2 by using two-color resonant four-wave-mixing spectroscopy. J Chem Phys 2022; 156:184305. [PMID: 35568551 DOI: 10.1063/5.0087743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A highly excited electronic state of dicopper is observed and characterized for the first time. The [39.6]0u +-X1Σg +(0g +) system is measured at rotational resolution by using degenerate and two-color resonant four-wave-mixing, as well as laser induced fluorescence spectroscopy. Double-resonance experiments are performed by labeling selected rotational levels of the ground state by tuning the probe laser wavelength to transitions in the well-known (1-0) band of the B0u +-X1Σg +(0g +) electronic system. Spectra obtained by scans of the pump laser in the UV wavelength range were then assigned unambiguously by the stringent double-resonance selection rules. The absence of a Q-band suggests a parallel transition (ΔΩ = 0) and determines the term symbol of the state as 0u + in Hund's case (c) notation. The equilibrium constants for 63Cu2 are Te = 39 559.921(92) cm-1, ωe = 277.70(14) cm-1, Be = 0.104 942(66) cm-1, and re = 2.2595(11) Å. These findings are supported by high-level ab initio calculations at the MRCI+Q level, which clearly identifies this state as resulting from a 4p ← 3d transition. In addition, three dark perturber states are found in the v = 1 and v = 2 vibrational levels of the new state. A deperturbation analysis characterizes the interaction and rationalizes the anomalous dips in the excitation spectrum of the [39.6]0u +-X1Σg +(0g +) system.
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Affiliation(s)
- Jiaye Jin
- Photon Science Division, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - Qiang Zhang
- Photon Science Division, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - Peter Bornhauser
- Photon Science Division, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - Gregor Knopp
- Photon Science Division, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - Roberto Marquardt
- Laboratoire de Chimie Quantique, Institut de Chimie, Université de Strasbourg, 4 rue Blaise Pascal - CS90032, 67081 Strasbourg Cedex, France
| | - Peter P Radi
- Photon Science Division, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
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4
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Mandal S, Gatti F, Bindech O, Marquardt R, Tremblay JC. Multidimensional Stochastic Dissipative Quantum Dynamics Using a Lindblad Operator. J Chem Phys 2022; 156:094109. [DOI: 10.1063/5.0079735] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Souvik Mandal
- Laboratoire de Physique et Chimie Théoriques, Universite de Lorraine - Site de Metz, France
| | - Fabien Gatti
- Institut des Sciences Moléculaires d'Orsay, Paris-Saclay University, France
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5
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Marquardt R. The quantum mean square displacement of thermalized CO on Cu(100) in the short time approximation. Phys Chem Chem Phys 2022; 24:26519-26528. [DOI: 10.1039/d2cp03045d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The mean square displacement of a thermalized CO molecule moving on a copper substrate is evaluated on the basis of a new quantum dynamical approach (Mol. Phys. 119, e1971315, 2021); results at 190 K, the Cu(100) lattice constant a ≈ 256 pm.
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Affiliation(s)
- Roberto Marquardt
- Laboratoire de Chimie Quantique – Institut de Chimie – UMR 7177 CNRS/Université de Strasbourg, 4, rue Blaise Pascal – CS 90032, 67081 STRASBOURG CEDEX, France
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6
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Affiliation(s)
- Roberto Marquardt
- Laboratoire de Chimie Quantique, Institut de Chimie, UMR 7177 CNRS/Unistra, Université de Strasbourg, Strasbourg, France
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Marquardt R. Mean square displacement of a free quantum particle in a thermal state. Mol Phys 2021. [DOI: 10.1080/00268976.2021.1971315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Roberto Marquardt
- Laboratoire de Chimie Quantique – Institut de Chimie – UMR 7177 CNRS/Unistra, Université de Strasbourg, Strasbourg Cedex, France
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Holst B, Alexandrowicz G, Avidor N, Benedek G, Bracco G, Ernst WE, Farías D, Jardine AP, Lefmann K, Manson JR, Marquardt R, Artés SM, Sibener SJ, Wells JW, Tamtögl A, Allison W. Material properties particularly suited to be measured with helium scattering: selected examples from 2D materials, van der Waals heterostructures, glassy materials, catalytic substrates, topological insulators and superconducting radio frequency materials. Phys Chem Chem Phys 2021; 23:7653-7672. [PMID: 33625410 DOI: 10.1039/d0cp05833e] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Helium Atom Scattering (HAS) and Helium Spin-Echo scattering (HeSE), together helium scattering, are well established, but non-commercial surface science techniques. They are characterised by the beam inertness and very low beam energy (<0.1 eV) which allows essentially all materials and adsorbates, including fragile and/or insulating materials and light adsorbates such as hydrogen to be investigated on the atomic scale. At present there only exist an estimated less than 15 helium and helium spin-echo scattering instruments in total, spread across the world. This means that up till now the techniques have not been readily available for a broad scientific community. Efforts are ongoing to change this by establishing a central helium scattering facility, possibly in connection with a neutron or synchrotron facility. In this context it is important to clarify what information can be obtained from helium scattering that cannot be obtained with other surface science techniques. Here we present a non-exclusive overview of a range of material properties particularly suited to be measured with helium scattering: (i) high precision, direct measurements of bending rigidity and substrate coupling strength of a range of 2D materials and van der Waals heterostructures as a function of temperature, (ii) direct measurements of the electron-phonon coupling constant λ exclusively in the low energy range (<0.1 eV, tuneable) for 2D materials and van der Waals heterostructures (iii) direct measurements of the surface boson peak in glassy materials, (iv) aspects of polymer chain surface dynamics under nano-confinement (v) certain aspects of nanoscale surface topography, (vi) central properties of surface dynamics and surface diffusion of adsorbates (HeSE) and (vii) two specific science case examples - topological insulators and superconducting radio frequency materials, illustrating how combined HAS and HeSE are necessary to understand the properties of quantum materials. The paper finishes with (viii) examples of molecular surface scattering experiments and other atom surface scattering experiments which can be performed using HAS and HeSE instruments.
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Affiliation(s)
- Bodil Holst
- Department of Physics and Technology, University of Bergen, Allegaten 55, 5007 Bergen, Norway.
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Bornhauser P, Beck M, Zhang Q, Knopp G, Marquardt R, Gourlaouen C, Radi PP. Accurate ground state potential of Cu 2 up to the dissociation limit by perturbation assisted double-resonant four-wave mixing. J Chem Phys 2020; 153:244305. [PMID: 33380116 DOI: 10.1063/5.0028908] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Perturbation facilitated double-resonant four-wave mixing is applied to access high-lying vibrational levels of the X 1Σg + (0g +) ground state of Cu2. Rotationally resolved transitions up to v″ = 102 are measured. The highest observed level is at 98% of the dissociation energy. The range and accuracy of previous measurements are significantly extended. By applying the near dissociation equation developed by Le Roy [R. J. Le Roy, J. Quant. Spectrosc. Radiat. Transfer 186, 197 (2017)], a dissociation energy of De = 16 270(7) hc cm-1 is determined, and an accurate potential energy function for the X 1Σg + (0g +) ground state is obtained. Molecular constants are determined from the measured transitions and by solving the radial Schrödinger equation using this function and are compared with results from earlier measurements. In addition, benchmark multi-reference configuration interaction computations are performed using the Douglas-Kroll-Hess Hamiltonian and the appropriate basis of augmented valence quadruple ζ type. Coupled-cluster single, double, and perturbative triple calculations were performed for comparison.
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Affiliation(s)
- P Bornhauser
- Paul Scherrer Institute, Photon Science Department, CH-5232 Villigen, Switzerland
| | - M Beck
- Paul Scherrer Institute, Photon Science Department, CH-5232 Villigen, Switzerland
| | - Q Zhang
- Paul Scherrer Institute, Photon Science Department, CH-5232 Villigen, Switzerland
| | - G Knopp
- Paul Scherrer Institute, Photon Science Department, CH-5232 Villigen, Switzerland
| | - R Marquardt
- Laboratoire de Chimie Quantique, Institut de Chimie, UMR 7177, Université de Strasbourg/CNRS, 4, Rue Blaise Pascal - CS90032, 67081 Strasbourg Cedex, France
| | - C Gourlaouen
- Laboratoire de Chimie Quantique, Institut de Chimie, UMR 7177, Université de Strasbourg/CNRS, 4, Rue Blaise Pascal - CS90032, 67081 Strasbourg Cedex, France
| | - P P Radi
- Paul Scherrer Institute, Photon Science Department, CH-5232 Villigen, Switzerland
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Marquardt R, Quack M, Stohner J, Thanopulos I. Quantum dynamics and spectra of the iodine atom in a strong laser field as calculated with the URIMIR package. Mol Phys 2019. [DOI: 10.1080/00268976.2019.1606952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- R. Marquardt
- Laboratoire de Chimie Quantique, Institut de Chimie (UMR 7177 CNRS/Unistra), Université de Strasbourg, Strasbourg, France
| | - M. Quack
- Laboratory of Physical Chemistry, ETH Zurich, Zurich, Switzerland
| | - J. Stohner
- ZHAW Zurich University of Applied Sciences, ICBT Institute of Chemistry and Biotechnology, ICTNS, Wädenswil, Switzerland
| | - I. Thanopulos
- Department of Optics and Optometry, T.E.I. of Western Greece, Aigio, Greece
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11
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Godde B, Jouaiti A, Mauro M, Marquardt R, Chaumont A, Robert V. The Motion of an Azobenzene Light‐Controlled Switch: A Joint Theoretical and Experimental Approach. ChemSystemsChem 2019. [DOI: 10.1002/syst.201900003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Bérangère Godde
- Laboratoire de Tectonique MoléculaireUMR UDS-CNRS 7140icFRCUniversité de Strasbourg Institut Le Bel, 4, rue B. Pascal F-67000 Strasbourg France
| | - Abdelaziz Jouaiti
- Laboratoire de Tectonique MoléculaireUMR UDS-CNRS 7140icFRCUniversité de Strasbourg Institut Le Bel, 4, rue B. Pascal F-67000 Strasbourg France
| | - Matteo Mauro
- Institut de Physique et Chimie des Matériaux de StrasbourgUMR UDS-CNRS 7504Université de Strasbourg 23, rue du Loess F-67000 Strasbourg France
| | - Roberto Marquardt
- Laboratoire de Chimie QuantiqueInstitut de Chimie, UMR UDS-CNRS 7177Université de Strasbourg Institut Le Bel, 4, rue B. Pascal F-67000 Strasbourg France
| | - Alain Chaumont
- Laboratoire de Chimie Moléculaire de l'Etat SolideUMR UDS-CNRS 7140Université de Strasbourg Institut Le Bel 4, rue B. Pascal F-67000 Strasbourg France
| | - Vincent Robert
- Laboratoire de Chimie QuantiqueInstitut de Chimie, UMR UDS-CNRS 7177Université de Strasbourg Institut Le Bel, 4, rue B. Pascal F-67000 Strasbourg France
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12
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Visser B, Beck M, Bornhauser P, Knopp G, van Bokhoven JA, Radi P, Gourlaouen C, Marquardt R. New experimental and theoretical assessment of the dissociation energy of C2. Mol Phys 2019. [DOI: 10.1080/00268976.2018.1564849] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
| | - Martin Beck
- Paul Scherrer Institute, Villigen, Switzerland
| | | | | | - Jeroen Anton van Bokhoven
- Paul Scherrer Institute, Villigen, Switzerland
- Institute for Chemical and Bioengineering, ETH Zurich, Zurich, Switzerland
| | - Peter Radi
- Paul Scherrer Institute, Villigen, Switzerland
| | - Christophe Gourlaouen
- Laboratoire de Chimie Quantique – Institut de Chimie – UMR 7177 CNRS/Unistra, Université de Strasbourg, Strasbourg, France
| | - Roberto Marquardt
- Laboratoire de Chimie Quantique – Institut de Chimie – UMR 7177 CNRS/Unistra, Université de Strasbourg, Strasbourg, France
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13
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Affiliation(s)
- Roberto Marquardt
- Laboratoire de Chimie Quantique - Institut de Chimie - UMR 7177 CNRS/unistra, Université de Strasbourg, Strasbourg, France
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Affiliation(s)
- Csaba Fábri
- Laboratory of Molecular Structure and Dynamics, Institute of Chemistry, Eötvös Loránd University, Pázmány Péter sétány 1/A, H-1117 Budapest, Hungary
- MTA-ELTE Complex Chemical Systems Research Group, P.O. Box 32, H-1518 Budapest 112, Hungary
- Physical Chemistry, ETH Zürich, CH-8093 Zürich, Switzerland
| | - Roberto Marquardt
- Physical Chemistry, ETH Zürich, CH-8093 Zürich, Switzerland
- Laboratoire de Chimie Quantique, Institut de Chimie UMR 7177 CNRS/Université de Strasbourg, 4, Rue Blaise Pascal CS 90032, 67081 Strasbourg Cedex, France
| | - Attila G. Császár
- Laboratory of Molecular Structure and Dynamics, Institute of Chemistry, Eötvös Loránd University, Pázmány Péter sétány 1/A, H-1117 Budapest, Hungary
- MTA-ELTE Complex Chemical Systems Research Group, P.O. Box 32, H-1518 Budapest 112, Hungary
| | - Martin Quack
- Physical Chemistry, ETH Zürich, CH-8093 Zürich, Switzerland
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Abstract
Abstract
In 2011 the General Conference on Weights and Measures (CGPM) noted the intention of the International Committee for Weights and Measures (CIPM) to revise the entire International System of Units (SI) by linking all seven base units to seven fundamental physical constants. Of particular interest to chemists, new definitions for the kilogram and the mole have been proposed. A recent IUPAC Technical Report discussed these new definitions in relation to immediate consequences for the chemical community. This IUPAC Recommendation on the preferred definition of the mole follows from this Technical Report. It supports a definition of the mole based on a specified number of elementary entities, in contrast to the present 1971 definition.
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Affiliation(s)
- Roberto Marquardt
- Laboratoire de Chimie Quantique, Institut de Chimie , Université de Strasbourg , 1 Rue Blaise Pascal , F-67008 Strasbourg , France
| | - Juris Meija
- National Research Council Canada, Measurement Science and Standards , 1200 Montreal Road M-12 , Ottawa, ON K1A 0R6 , Canada
| | - Zoltán Mester
- National Research Council Canada, Measurement Science and Standards , 1200 Montreal Road M-12 , Ottawa, ON K1A 0R6 , Canada
| | - Marcy Towns
- Department of Chemistry , Purdue University , 560 Oval Drive , West Lafayette, IN , USA
| | - Ron Weir
- Department of Chemistry and Chemical Engineering, Royal Military College of Canada , P.O. Box 17000, Stn. Forces , Kingston, ON K7K 7B4 , Canada
| | - Richard Davis
- Bureau International des Poids et Mesures, Pavillon de Breteuil F-92312 , Sèvres Cedex , France
| | - Jürgen Stohner
- ZHAW Zürich University of Applied Sciences , ICBT Institute for Chemistry and Biotechnology , Einsiedlerstrasse 31 , CH 8820 Wädenswil , Switzerland
- Guest scientist at: ETHZ Swiss Federal Institute of Technology, Laboratory for Physical Chemistry, ETH Hönggerberg , Wolfgang-Pauli-Strasse 10 , CH-8092 Zürich , Switzerland , e-mail:
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Visser B, Beck M, Bornhauser P, Knopp G, van Bokhoven JA, Marquardt R, Gourlaouen C, Radi PP. Identification of a new low energy 1 u state in dicopper with resonant four-wave mixing. J Chem Phys 2017; 147:214308. [PMID: 29221416 DOI: 10.1063/1.5006107] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The low energy electronic structure of the copper dimer has been re-investigated using non-linear four-wave mixing spectroscopy and high level ab initio calculations. In addition to the measurement of the previously reported A, B, and C electronic states, a new state denoted A' is identified with T0 = 20 100.4090(16) cm-1 (63Cu2). Rotational analysis of the A'-X (0,0) and (1,0) transitions leads to the assignment of A' 1u. Ab initio calculations present the first theoretical description of the low energy states of the copper dimer in Hund's case (c) and confirm the experimental assignment. The discovery of this new low energy excited state emphasizes that spin-orbit coupling is significant in states with d-hole electronic configurations and resolves a decades-long mystery in the initial assignment of the A state.
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Affiliation(s)
- B Visser
- Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - M Beck
- Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - P Bornhauser
- Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - G Knopp
- Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | | | - R Marquardt
- Laboratoire de Chimie Quantique, Institut de Chimie, Université de Strasbourg. 4, Rue Blaise Pascal-CS90032, 67081 Strasbourg Cedex, France
| | - C Gourlaouen
- Laboratoire de Chimie Quantique, Institut de Chimie, Université de Strasbourg. 4, Rue Blaise Pascal-CS90032, 67081 Strasbourg Cedex, France
| | - P P Radi
- Paul Scherrer Institute, CH-5232 Villigen, Switzerland
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Marquardt R, Meija J, Mester Z, Towns M, Weir R, Davis R, Stohner J. A critical review of the proposed definitions of fundamental chemical quantities and their impact on chemical communities (IUPAC Technical Report). PURE APPL CHEM 2017. [DOI: 10.1515/pac-2016-0808] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractIn the proposed new SI, the kilogram will be redefined in terms of the Planck constant and the mole will be redefined in terms of the Avogadro constant. These redefinitions will have some consequences for measurements in chemistry. The goal of the Mole Project (IUPAC Project Number 2013-048-1-100) was to compile published work related to the definition of the quantity ‘amount of substance’, its unit the ‘mole’, and the consequence of these definitions on the unit of the quantity mass, the kilogram. The published work has been reviewed critically with the aim of assembling all possible aspects in order to enable IUPAC to judge the adequateness of the existing definitions or new proposals. Compilation and critical review relies on the broadest spectrum of interested IUPAC members.
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Affiliation(s)
- Roberto Marquardt
- Laboratoire de Chimie Quantique, Institut de Chimie, Université de Strasbourg, 1, Rue Blaise Pascal, F-67008 Strasbourg, France
| | - Juris Meija
- National Research Council Canada, Measurement Science and Standards, 1200 Montreal Road M-12, B-12, Ottawa, ON K1A 0R6, Canada
| | - Zoltan Mester
- National Research Council Canada, Measurement Science and Standards, 1200 Montreal Road M-12, G-7, Ottawa, ON K1A 0R6, Canada
| | - Marcy Towns
- Purdue University, Department of Chemistry, Office WTHR 107E, 560 Oval Drive, West Lafayette, IN 47907, USA
| | - Ron Weir
- Royal Military College of Canada, Department of Chemistry and Chemical Engineering, P.O. Box 17000, Stn. Forces, Kingston, ON K7K 7B4, Canada
| | - Richard Davis
- Bureau International des Poids et Mesures (BIPM), Pavillon de Breteuil, F-92312 Sèvres Cedex, France
| | - Jürgen Stohner
- Chair Commission I.1 Green Book, Chair Mole Project, ZHAW Zurich University of Applied Sciences, ICBT Institute of Chemistry and Biotechnology, Einsiedlerstrasse 31, CH-8820 Wädenswil, Switzerland
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Bornhauser P, Visser B, Beck M, Knopp G, van Bokhoven JA, Marquardt R, Radi PP. Experimental and theoretical investigation of the vibrational band structure of the 1 Πu5−1 Πg5 high-spin system of C2. J Chem Phys 2017; 146:114309. [DOI: 10.1063/1.4978334] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Affiliation(s)
- P. Bornhauser
- Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - B. Visser
- Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - M. Beck
- Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - G. Knopp
- Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - J. A. van Bokhoven
- Paul Scherrer Institute, CH-5232 Villigen, Switzerland
- Institute for Chemical and Bioengineering, ETHZ, Zürich, Switzerland
| | - R. Marquardt
- Laboratoire de Chimie Quantique, Institut de Chimie, Université de Strasbourg 4, Rue Blaise Pascal, CS90032 67081 Strasbourg Cedex, France
| | - P. P. Radi
- Paul Scherrer Institute, CH-5232 Villigen, Switzerland
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Affiliation(s)
- Yann Cornaton
- Laboratoire de
Chimie Quantique - Institut de Chimie UMR 7177 CNRS/Université de Strasbourg -1, rue
Blaise Pascal - BP 296/R8, 67008 Strasbourg Cedex, France
| | - Roberto Marquardt
- Laboratoire de
Chimie Quantique - Institut de Chimie UMR 7177 CNRS/Université de Strasbourg -1, rue
Blaise Pascal - BP 296/R8, 67008 Strasbourg Cedex, France
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21
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Bornhauser P, Marquardt R, Gourlaouen C, Knopp G, Beck M, Gerber T, van Bokhoven JA, Radi PP. Perturbation-facilitated detection of the first quintet-quintet band in C2. J Chem Phys 2015; 142:094313. [DOI: 10.1063/1.4913925] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- P. Bornhauser
- Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - R. Marquardt
- Laboratoire de Chimie Quantique, Institut de Chimie, Université de Strasbourg. 4, rue Blaise Pascal - CS90032 67081 STRASBOURG CEDEX, France
| | - C. Gourlaouen
- Laboratoire de Chimie Quantique, Institut de Chimie, Université de Strasbourg. 4, rue Blaise Pascal - CS90032 67081 STRASBOURG CEDEX, France
| | - G. Knopp
- Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - M. Beck
- Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - T. Gerber
- Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - J. A. van Bokhoven
- Paul Scherrer Institute, CH-5232 Villigen, Switzerland
- Institute for Chemical and Bioengineering, ETHZ, Zürich, Switzerland
| | - P. P. Radi
- Paul Scherrer Institute, CH-5232 Villigen, Switzerland
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Abstract
The van Hove formula for the dynamical structure factor (DSF) related to particle scattering at mobile adsorbates is extended to include the relaxation of the adsorbates' vibrational states. The total rate obtained from the DSF is assumed to be the sum of a diffusion and a relaxation rate. A simple kinetic model to support this assumption is presented. To illustrate its potential applicability, the formula is evaluated using wave functions, energies, and lifetimes of vibrational states obtained for H/Pd(111) from first-principle calculations. Results show that quantum effects can be expected to be important even at room temperature.
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Affiliation(s)
- Thiago Firmino
- †Laboratoire de Chimie Quantique, Institut de Chimie, UMR 7177 CNRS/Université de Strasbourg, 1 rue Blaise Pascal, BP 296/R8, 67008 Strasbourg Cedex, France
| | - Roberto Marquardt
- †Laboratoire de Chimie Quantique, Institut de Chimie, UMR 7177 CNRS/Université de Strasbourg, 1 rue Blaise Pascal, BP 296/R8, 67008 Strasbourg Cedex, France
| | - Fabien Gatti
- ‡CTMM, Institut Charles Gerhardt, UMR 5253 CNRS/Université de Montpellier 2, CC 1501, 34095 Montpellier Cedex 05, France
| | - Wei Dong
- ¶Laboratoire de Chimie, UMR 5182 CNRS/Ecole Normale Supérieure de Lyon, 46 Allée d'Italie, 69364 Lyon Cedex 07, France
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Sych Y, Bornhauser P, Knopp G, Liu Y, Gerber T, Marquardt R, Radi PP. Perturbation facilitated two-color four-wave-mixing spectroscopy of C3. J Chem Phys 2014; 139:154203. [PMID: 24160506 DOI: 10.1063/1.4825198] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Perturbation-facilitated two-color resonant four-wave-mixing spectroscopy is realized to access the (dark) triplet manifold of the C3 molecule from the singlet X̃(1)Σg (+) ground state. The inherent nonlinear signal dependence and coherence of the technique result in a favorable detection of the excited triplet states of interest. The observation of a newly found (3)Δu electronic state is achieved by a two-step excitation via "gate-way" levels (i.e., singlet-triplet mixed levels). Additionally, by fixing the probe laser on a transition exhibiting mainly triplet-triplet character and scanning the pump laser, we demonstrate an effective spin-filtering in a four-wave mixing measurement where only transitions to the perturber (3)Σu(-) state appear exclusively in an otherwise congested spectral range of the Comet band. Ab initio calculations of excited triplet states complement our analysis with the electronic assignment of the observed resonances.
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Affiliation(s)
- Y Sych
- Department General Energy Research, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
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Marquardt R, Sagui K, Zheng J, Thiel W, Luckhaus D, Yurchenko S, Mariotti F, Quack M. Global Analytical Potential Energy Surface for the Electronic Ground State of NH3 from High Level ab Initio Calculations. J Phys Chem A 2013; 117:7502-22. [DOI: 10.1021/jp4016728] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Roberto Marquardt
- Laboratoire de Chimie Quantique, Institut de Chimie UMR 7177 CNRS/Université de Strasbourg, 1 rue Blaise Pascal, BP 296/R8, Strasbourg CEDEX, France
| | - Kenneth Sagui
- Laboratoire
de Chimie Theorique, Université de Marne-la-Vallée 5 Bd Descartes (Champs-sur-Marne), F-77454 Marne-la-Vallée
Cedex 2, France
| | - Jingjing Zheng
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470 Mülheim an der Ruhr, Germany
| | - Walter Thiel
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470 Mülheim an der Ruhr, Germany
| | - David Luckhaus
- Chemistry Department, University of British Columbia, 6174 University Boulevard, Vancouver,
BC V6T 1Z3, Canada
| | - Sergey Yurchenko
- Department
of Physics and Astronomy, University College London, London, WC1E 6BT, U.K
| | - Fabio Mariotti
- Laboratorium für Physikalische Chemie, ETH Zürich
Wolfgang Pauli Str. 10, CH-8093 Zürich, Switzerland
| | - Martin Quack
- Laboratorium für Physikalische Chemie, ETH Zürich
Wolfgang Pauli Str. 10, CH-8093 Zürich, Switzerland
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Goetz SM, Pfaeffl M, Huber J, Singer M, Marquardt R, Weyh T. Circuit topology and control principle for a first magnetic stimulator with fully controllable waveform. Annu Int Conf IEEE Eng Med Biol Soc 2013; 2012:4700-3. [PMID: 23366977 DOI: 10.1109/embc.2012.6347016] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Magnetic stimulation pulse sources are very inflexible high-power devices. The incorporated circuit topology is usually limited to a single pulse type. However, experimental and theoretical work shows that more freedom in choosing or even designing waveforms could notably enhance existing methods. Beyond that, it even allows entering new fields of application. We propose a technology that can solve the problem. Even in very high frequency ranges, the circuitry is very flexible and is able generate almost every waveform with unrivaled accuracy. This technology can dynamically change between different pulse shapes without any reconfiguration, recharging or other changes; thus the waveform can be modified also during a high-frequency repetitive pulse train. In addition to the option of online design and generation of still unknown waveforms, it amalgamates all existing device types with their specific pulse shapes, which have been leading an independent existence in the past years. These advantages were achieved by giving up the common basis of all magnetic stimulation devices so far, i.e., the high-voltage oscillator. Distributed electronics handle the high power dividing the high voltage and the required switching rate into small portions.
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Affiliation(s)
- S M Goetz
- Duke University, Durham, NC 27710, USA.
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Cornaton Y, Krishna BM, Marquardt R. A new global and compact analytical representation of the potential energy surface of triatomic systems: application to copper nitrosyl and water. Mol Phys 2013. [DOI: 10.1080/00268976.2013.800605] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Yann Cornaton
- Laboratoire de Chimie Quantique, Université de Chimie, UMR 7177 CNRS/UdS Université de Strasbourg , 4, rue Blaise Pascal, CS90032, STRASBOURG CEDEX, 67081, France
| | - B. Murali Krishna
- Laboratoire de Chimie Quantique, Université de Chimie, UMR 7177 CNRS/UdS Université de Strasbourg , 4, rue Blaise Pascal, CS90032, STRASBOURG CEDEX, 67081, France
| | - Roberto Marquardt
- Laboratoire de Chimie Quantique, Université de Chimie, UMR 7177 CNRS/UdS Université de Strasbourg , 4, rue Blaise Pascal, CS90032, STRASBOURG CEDEX, 67081, France
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27
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Abstract
Time-resolved spectroscopy in the femtosecond and attosecond time domain is a tool to unravel the dynamics of nuclear and electronic motion in molecular systems. Theoretical insight into the underlying physical processes is ideally gained by solving the time-dependent Schrödinger equation. In this work, methods currently used to solve this equation are reviewed in a compact presentation. These methods involve numerical representations of wavefunctions and operators, the calculation of time evolution operators, the setting up of the Hamiltonian operators and the types of coordinates to be used hereto. The advantages and disadvantages of some methods are discussed.
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Affiliation(s)
- Roberto Marquardt
- Laboratoire de Chimie Quantique, Institut de Chimie, UMR 7177 CNRS/UdS, Université de Strasbourg, 4, rue Blaise Pascal-CS90032, 67081 Strasbourg-Cedex, France.
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Marquardt R, Sanrey M, Gatti F, Le Quéré F. Full-dimensional quantum dynamics of vibrationally highly excited NHD2. J Chem Phys 2010; 133:174302. [DOI: 10.1063/1.3496374] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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31
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Figueroa FL, Israel A, Neori A, Martínez B, Malta EJ, Put A, Inken S, Marquardt R, Abdala R, Korbee N. Effect of nutrient supply on photosynthesis and pigmentation to short-term stress (UV radiation) in Gracilaria conferta (Rhodophyta). Mar Pollut Bull 2010; 60:1768-1778. [PMID: 20619863 DOI: 10.1016/j.marpolbul.2010.06.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2010] [Revised: 06/09/2010] [Accepted: 06/14/2010] [Indexed: 05/29/2023]
Abstract
The effects of increased photosynthetic active radiation (PAR), UV radiation (UVR), and nutrient supply on photosynthetic activity, pigment content, C:N ratio and biomass yield were studied in tank cultivated Gracilaria conferta (Rhodophyta). Electron transport rate (ETR) and biliprotein content were higher under high nutrient supply (HNS), obtained from fishpond effluents, compared to low nutrient supply (LNS), in contrast to mycosporine-like amino acids (MAAs) dynamic. The high MAA content in LNS-algae could be explained by higher UVR penetration in the thallus and by the competition for the use of nutrients with other processes. Effective quantum yield decreased after short-term exposure to high irradiance whereas full recovery in shade was produced only under slightly heat shock. UVA radiation provoked an additional decrease in photosynthesis under high water temperature. UVB radiation reversed UVA's negative effect mainly with HNS. Results support that nutrient-sufficiency help G. conferta to resist environmental changes as short-term temperature increase.
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Affiliation(s)
- F L Figueroa
- Department of Ecology, Faculty of Sciences, University of Málaga, Campus Universitario de Teatinos s/n, 29071 Málaga, Spain
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32
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Gindensperger E, Haegy A, Daniel C, Marquardt R. Ab initio study of the electronic singlet excited-state properties of tryptophan in the gas phase: The role of alanyl side-chain conformations. Chem Phys 2010. [DOI: 10.1016/j.chemphys.2010.07.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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33
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Marquardt R, Cuvelier F, Olsen RA, Baerends EJ, Tremblay JC, Saalfrank P. A new analytical potential energy surface for the adsorption system CO/Cu(100). J Chem Phys 2010; 132:074108. [DOI: 10.1063/1.3308481] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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34
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Marquardt R, Christ T, Bonfils P. Gelartige Tränenersatzmittel und unspezifische Augensalben auf Intensivstationen und in der perioperativen Anwendung. Anasthesiol Intensivmed Notfallmed Schmerzther 2008. [DOI: 10.1055/s-2007-1002543] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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35
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36
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Marquardt R, Sagui K. A complete list of symmetry adapted expressions to the fourth power for compact bending potentials in molecules with and symmetry from a general symbolic algebra program. Mol Phys 2007. [DOI: 10.1080/00268970701244783] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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37
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Staboulidou I, Freitag U, Marquardt R, Wüstemann M, Hillemanns P, Scharf A. [Quality assured ultrasound simulation training for the detection of fetal malformations--can a training benefit be evidenced?]. Z Geburtshilfe Neonatol 2006; 210:135-40. [PMID: 16941306 DOI: 10.1055/s-2006-947217] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
INTRODUCTION The factual sonographic training in obstetrics differs in Germany in a broad range. In this context, a tendency towards minimalistic dealings with this issue prevails. In contrast to this, the provisions of the German maternity guidelines relating to ultrasound clearly define quality oriented requirements serving altogether as a basic sonographic standard which mandatorily has to be met by all German Obstetricians. In order to close this gap between professional education and social demand, a training concept regarding obstetric ultrasound was devised by the German Association of Gynecologists utilizing the ultrasound simulator system. The aim of this study was to evaluate the usefulness and the effectiveness of this method and its potential role and benefit in structured sonographic training. MATERIAL AND METHODS Between October 2004 and August 2005, 74 obstetric ultrasound training courses according to the ultrasound simulator concept of the Medical School of Hanover were realized in nine federal states of Germany by the German Academy of Gynecology. The aim of these courses was it to procure ultrasound knowledge regarding the structured sonographic exclusion of fetal malformations in a compact manner. As a measure of quality assurance, a standardized questionnaire was issued before and after the courses in order to analyze the benefit of these simulator-based ultrasound courses. RESULTS The concept found prevailing approval (90 %) at the level of principle, practical implementation and clinical usefulness. 88,2 % of the participants estimated their subjective training effect as being good. The analysis of the questionnaire showed a statistically significant improvement of sonographic knowledge. On average, 74.1 % of the questions were answered correctly by the end of the course as opposed to a mere 46.3 % at the beginning. CONCLUSION Structured ultrasound training courses based on the ultrasound simulator system seem to be able to define a basic quality of training and significantly improves examiners' skills in prenatal medicine possible independent of local or structural factors. Hence they seem to be a suitable instrument to close the gap between the sonographic education worthy of improvement and the existing social demand for efficiacy of obstetric sonography.
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Affiliation(s)
- I Staboulidou
- Frauenklinik der Med. Hochschule Hannover, Hannover.
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38
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Marquardt R, Sagui K, Klopper W, Quack M. Global Analytical Potential Energy Surface for Large Amplitude Nuclear Motions in Ammonia. J Phys Chem B 2005; 109:8439-51. [PMID: 16851991 DOI: 10.1021/jp0507243] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An analytical, full-dimensional, and global representation of the potential energy surface of NH(3) in the lowest adiabatic electronic state is developed, and parameters are determined by adjustment to ab initio data and thermochemical data for several low-lying dissociation channels. The electronic structure is calculated at the CASPT2 level within an [8,7] active space. The representation is compared to other recently published potential energy surfaces for this molecule. The present representation is distinguished by giving a qualitatively correct description of the potential energy for very large amplitude displacements of the nuclei from equilibrium. Other characteristic features of the present surface are the equilibrium geometries r(eq)(NH(3)) approximately 101.24 pm, r(eq)(NH(2)) approximately 102.60 pm, alpha(eq)(NH(3)) approximately 106.67 degrees, and the inversion barrier at r(inv)(NH(3)) approximately 99.80 pm and 1781 cm(-1) above the NH(3) minimum. The barrier to linearity in NH(2) is 11,914 cm(-1) above the NH(2)((2)B(1)) minimum. While the quartic force field for NH(3) from the present representation is significantly different from that of the other potential energy surfaces, the vibrational structures obtained from perturbation theory are quite similar for all representations studied here.
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Affiliation(s)
- Roberto Marquardt
- Laboratoire de Chimie Théorique, Université de Marne-la-Vallée, 5, Bd Descartes, Champs sur Marne, F-77454 Marne-la-Vallée Cedex 2, France.
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39
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Blank R, Rolfs JP, Südekum KH, Frohlich A, Marquardt R, Wolffram S. Effect of roughage:concentrate ratio in the diet on
systemic availability and excretion of ochratoxin A
in sheep. J Anim Feed Sci 2004. [DOI: 10.22358/jafs/74087/2004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Cuvelier F, Hervé S, Marquardt R, Sagui K. Potential Energy Surfaces for Vibrational and Rotational Wave Packet Motion in Polyatomic Molecular Systems. Chimia (Aarau) 2004. [DOI: 10.2533/000942904777677821] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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41
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Marquardt R, Quack M. Global Analytical Potential Hypersurface for Large Amplitude Nuclear Motion and Reactions in Methane II. Characteristic Properties of the Potential and Comparison to Other Potentials and Experimental Information. J Phys Chem A 2004. [DOI: 10.1021/jp037305v] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Roberto Marquardt
- Laboratoire de Chimie Theorique, Université de Marne-la-Vallée, 5 Bd Descartes (Champs-sur-Marne), F-77454 Marne-la-Vallée CEDEX 2, France
| | - Martin Quack
- Physical Chemistry, ETH Zürich, CH-8093 Zürich, Switzerland
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Marquardt R, Quack M, Thanopulos I, Luckhaus D. A global electric dipole function of ammonia and isotopomers in the electronic ground state. J Chem Phys 2003. [DOI: 10.1063/1.1617272] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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43
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Marquardt R, Quack M, Thanopulos I, Luckhaus D. Tunneling dynamics of the NH chromophore in NHD2 during and after coherent infrared excitation. J Chem Phys 2003. [DOI: 10.1063/1.1514577] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Roberto Marquardt
- Laboratoire de Chimie Théorique, Université de Marne-la-Vallée, 5 Bd Descartes (Champs-sur-Marne), F-77454 Marne-la-Vallée Cedex 2, France
| | - Martin Quack
- Physical Chemistry, ETH Zürich, CH-8093-Zürich, Switzerland
| | | | - David Luckhaus
- Institut für Physikalische Chemie, Universität Göttingen, Tammanstrasse 6, D-37077 Göttingen, Germany
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Hervé S, Le Quéré F, Marquardt R. Generation of semiclassical and delocalized vibrational wave packet motion of HF molecules oriented in an external static electric field. J Chem Phys 2002. [DOI: 10.1063/1.1436114] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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45
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Rau A, Hogg T, Marquardt R, Hilgenfeld R. A new lysozyme fold. Crystal structure of the muramidase from Streptomyces coelicolor at 1.65 A resolution. J Biol Chem 2001; 276:31994-9. [PMID: 11427528 DOI: 10.1074/jbc.m102591200] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Cellosyl is a bacterial muramidase from Streptomyces coelicolor. Similar to other lysozymes, the enzyme cleaves the beta-1,4-glycosidic bond between N-acetylmuramic acid and N-acetylglucosamine units, but it also exhibits a beta-1,4-N,6-O-diacetylmuramidase activity. The latter enables Cellosyl to degrade the cell walls of Staphylococcus aureus, which are not hydrolyzed by chicken-, goose-, or bacteriophage T4-type lysozymes. The enzymatic activity and amino acid sequence of Cellosyl group it with lysozymes of the Chalaropsis type, for which no detailed structural information has been available so far. The crystal structure of Cellosyl from S. coelicolor has been determined to a resolution of 1.65 A and refined to an R-factor of 15.2%. The enzyme is comprised of a single domain and possesses an unusual beta/alpha-barrel fold. The last strand, beta 8, of the (beta/alpha)(5)beta(3)-barrel is found to be antiparallel to strands beta 7 and beta 1. Asp-9, Asp-98, and Glu-100 are located at the active site. The structure of Cellosyl exhibits a new lysozyme fold and represents a new class of polysaccharide-hydrolyzing beta/alpha-barrels.
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Affiliation(s)
- A Rau
- Department of Structural Biology & Crystallography, Institute of Molecular Biotechnology, Beutenbergstrasse 11, 07745 Jena, Germany
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46
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Hervé S, Quéré FL, Marquardt R. Rotational and vibrational wave packet motion during the infrared multiphoton excitation of HF. J Chem Phys 2001. [DOI: 10.1063/1.1330747] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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47
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Marquardt R, Quack M, Thanopulos I. Dynamical Chirality and the Quantum Dynamics of Bending Vibrations of the CH Chromophore in Methane Isotopomers. J Phys Chem A 2000. [DOI: 10.1021/jp994245d] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Roberto Marquardt
- Laboratorium für Physikalische Chemie, ETH-Zürich (Zentrum), 8092 - Zürich, Switzerland
| | - Martin Quack
- Laboratorium für Physikalische Chemie, ETH-Zürich (Zentrum), 8092 - Zürich, Switzerland
| | - Ioannis Thanopulos
- Laboratorium für Physikalische Chemie, ETH-Zürich (Zentrum), 8092 - Zürich, Switzerland
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Ziereis H, Schlager H, Schulte P, Köhler I, Marquardt R, Feigl C. In situ measurements of the NOxdistribution and variability over the eastern North Atlantic. ACTA ACUST UNITED AC 1999. [DOI: 10.1029/1999jd900175] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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49
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Marquardt R. Passive protective effect of egg-yolk antibodies against enterotoxigenic Escherichia coli K88+ infection in neonatal and early-weaned piglets. ACTA ACUST UNITED AC 1999. [DOI: 10.1016/s0928-8244(98)00147-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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50
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Marquardt R, Quack M. Global analytical potential hypersurfaces for large amplitude nuclear motion and reactions in methane. I. Formulation of the potentials and adjustment of parameters to ab initio data and experimental constraints. J Chem Phys 1998. [DOI: 10.1063/1.476513] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Roberto Marquardt
- Laboratorium für Physikalische Chemie, ETH-Zürich (Zentrum), 8092 Zürich, Switzerland
| | - Martin Quack
- Laboratorium für Physikalische Chemie, ETH-Zürich (Zentrum), 8092 Zürich, Switzerland
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