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Caballo A, Huits AJTM, Parker DH, Horke DA. Disentangling Multiphoton Ionization and Dissociation Channels in Molecular Oxygen Using Photoelectron-Photoion Coincidence Imaging. J Phys Chem A 2022; 127:92-98. [PMID: 36542330 PMCID: PMC9841573 DOI: 10.1021/acs.jpca.2c06707] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Multiphoton excitation of molecular oxygen in the 392-408 nm region is studied using a tunable femtosecond laser coupled with a double velocity map imaging photoelectron-photoion coincidence spectrometer. The laser intensity is held at ≤∼1 TW/cm2 to ensure excitation in the perturbative regime, where the possibility of resonance enhanced multiphoton ionization (REMPI) can be investigated. O2+ production is found to be resonance enhanced around 400 nm via three-photon excitation to the e'3Δu(v = 0) state, similar to results from REMPI studies using nanosecond dye lasers. O+ production reaches 7% of the total ion yield around 405 nm due to two processes: autoionization following five-photon excitation of O2, producing O2+(X(v)) in a wide range of vibrational states followed by two- or three-photon dissociation, or six-photon excitation to a superexcited O2** state followed by neutral dissociation and subsequent ionization of the electronically excited O atom. Coincidence detection is shown to be crucial in identifying these competing pathways.
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Affiliation(s)
- Ana Caballo
- Radboud
University, Institute for Molecules
and Materials, Heyendaalseweg
135, 6525 AJ Nijmegen, The Netherlands
| | - Anders J. T. M. Huits
- Radboud
University, Institute for Molecules
and Materials, Heyendaalseweg
135, 6525 AJ Nijmegen, The Netherlands
| | - David H. Parker
- Radboud
University, Institute for Molecules
and Materials, Heyendaalseweg
135, 6525 AJ Nijmegen, The Netherlands
| | - Daniel A. Horke
- Radboud
University, Institute for Molecules
and Materials, Heyendaalseweg
135, 6525 AJ Nijmegen, The Netherlands,
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2
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Armenta Butt S, Price SD. Bond-forming and electron-transfer reactivity between Ar2+ and O2. Phys Chem Chem Phys 2020; 22:8391-8400. [DOI: 10.1039/d0cp01194k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reactivity, energetics and dynamics of the bimolecular reactions between Ar2+ and O2 have been studied using a position sensitive coincidence methodology at a collision energy of 4.4 eV.
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3
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Veyrinas K, Saquet N, Marggi Poullain S, Lebech M, Houver JC, Lucchese RR, Dowek D. Dissociative photoionization of NO across a shape resonance in the XUV range using circularly polarized synchrotron radiation. J Chem Phys 2019; 151:174305. [PMID: 31703511 DOI: 10.1063/1.5121620] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
We report benchmark results for dissociative photoionization (DPI) spectroscopy and dynamics of the NO molecule in the region of the σ* shape resonance in the ionization leading to the NO+(c3Π) ionic state. The experimental study combines well characterized extreme ultraviolet (XUV) circularly polarized synchrotron radiation, delivered at the DESIRS beamline (SOLEIL), with ion-electron coincidence 3D momentum spectroscopy. The measured (N+, e) kinetic energy correlation diagrams reported at four discrete photon energies in the extended 23-33 eV energy range allow for resolving the different active DPI reactions and underline the importance of spectrally resolved studies using synchrotron radiation in the context of time-resolved studies where photoionization is induced by broadband XUV attosecond pulses. In the dominant DPI reaction which leads to the NO+(c3Π) ionic state, photoionization dynamics across the σ* shape resonance are probed by molecular frame photoelectron angular distributions where the parallel and perpendicular transitions are highlighted, as well as the circular dichroism CDAD(θe) in the molecular frame. The latter also constitute benchmark references for molecular polarimetry. The measured dynamical parameters are well described by multichannel Schwinger configuration interaction calculations. Similar results are obtained for the DPI spectroscopy of highly excited NO+ electronic states populated in the explored XUV photon energy range.
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Affiliation(s)
- K Veyrinas
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Univ. Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
| | - N Saquet
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Univ. Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
| | - S Marggi Poullain
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Univ. Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
| | - M Lebech
- Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
| | - J-C Houver
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Univ. Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
| | - R R Lucchese
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - D Dowek
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Univ. Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
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4
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Tang X, Garcia GA, Nahon L. New insights onto dissociation of state-selected O2+ ions investigated by double imaging photoelectron photoion coincidence: The superimposed 32Πu and c4Σu− inner-valence states. J Chem Phys 2018; 148:124309. [DOI: 10.1063/1.5011046] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Xiaofeng Tang
- Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, 230031 Anhui, China
- Synchrotron SOLEIL, L’Orme des Merisiers, St. Aubin BP 48, 91192 Gif sur Yvette, France
| | - Gustavo A. Garcia
- Synchrotron SOLEIL, L’Orme des Merisiers, St. Aubin BP 48, 91192 Gif sur Yvette, France
| | - Laurent Nahon
- Synchrotron SOLEIL, L’Orme des Merisiers, St. Aubin BP 48, 91192 Gif sur Yvette, France
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5
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Veyrinas K, Gruson V, Weber SJ, Barreau L, Ruchon T, Hergott JF, Houver JC, Lucchese RR, Salières P, Dowek D. Molecular frame photoemission by a comb of elliptical high-order harmonics: a sensitive probe of both photodynamics and harmonic complete polarization state. Faraday Discuss 2016; 194:161-183. [PMID: 27853775 DOI: 10.1039/c6fd00137h] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Due to the intimate anisotropic interaction between an XUV light field and a molecule resulting in photoionization (PI), molecular frame photoelectron angular distributions (MFPADs) are most sensitive probes of both electronic/nuclear dynamics and the polarization state of the ionizing light field. Consequently, they encode the complex dipole matrix elements describing the dynamics of the PI transition, as well as the three normalized Stokes parameters s1, s2, s3 characterizing the complete polarization state of the light, operating as molecular polarimetry. The remarkable development of advanced light sources delivering attosecond XUV pulses opens the perspective to visualize the primary steps of photochemical dynamics in time-resolved studies, at the natural attosecond to few femtosecond time-scales of electron dynamics and fast nuclear motion. It is thus timely to investigate the feasibility of measurement of MFPADs when PI is induced e.g., by an attosecond pulse train (APT) corresponding to a comb of discrete high-order harmonics. In the work presented here, we report MFPAD studies based on coincident electron-ion 3D momentum imaging in the context of ultrafast molecular dynamics investigated at the PLFA facility (CEA-SLIC), with two perspectives: (i) using APTs generated in atoms/molecules as a source for MFPAD-resolved PI studies, and (ii) taking advantage of molecular polarimetry to perform a complete polarization analysis of the harmonic emission of molecules, a major challenge of high harmonic spectroscopy. Recent results illustrating both aspects are reported for APTs generated in unaligned SF6 molecules by an elliptically polarized infrared driving field. The observed fingerprints of the elliptically polarized harmonics include the first direct determination of the complete s1, s2, s3 Stokes vector, equivalent to (ψ, ε, P), the orientation and the signed ellipticity of the polarization ellipse, and the degree of polarization P. They are compared to so far incomplete results of XUV optical polarimetry. We finally discuss the comparison between the outcomes of photoionization and high harmonic spectroscopy for the description of molecular photodynamics.
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Affiliation(s)
- K Veyrinas
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Univ. Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France.
| | - V Gruson
- LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-Sur-Yvette, France
| | - S J Weber
- LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-Sur-Yvette, France
| | - L Barreau
- LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-Sur-Yvette, France
| | - T Ruchon
- LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-Sur-Yvette, France
| | - J-F Hergott
- LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-Sur-Yvette, France
| | - J-C Houver
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Univ. Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France.
| | - R R Lucchese
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, USA
| | - P Salières
- LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-Sur-Yvette, France
| | - D Dowek
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Univ. Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France.
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Sturm FP, Wright TW, Ray D, Zalyubovskaya I, Shivaram N, Slaughter DS, Ranitovic P, Belkacem A, Weber T. Time resolved 3D momentum imaging of ultrafast dynamics by coherent VUV-XUV radiation. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:063110. [PMID: 27370429 DOI: 10.1063/1.4953441] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2016] [Accepted: 05/25/2016] [Indexed: 06/06/2023]
Abstract
We present a new experimental setup for measuring ultrafast nuclear and electron dynamics of molecules after photo-excitation and ionization. We combine a high flux femtosecond vacuum ultraviolet (VUV) and extreme ultraviolet (XUV) source with an internally cold molecular beam and a 3D momentum imaging particle spectrometer to measure electrons and ions in coincidence. We describe a variety of tools developed to perform pump-probe studies in the VUV-XUV spectrum and to modify and characterize the photon beam. First benchmark experiments are presented to demonstrate the capabilities of the system.
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Affiliation(s)
- F P Sturm
- Ultrafast X-Ray Science Lab, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - T W Wright
- Ultrafast X-Ray Science Lab, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - D Ray
- Ultrafast X-Ray Science Lab, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - I Zalyubovskaya
- Ultrafast X-Ray Science Lab, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - N Shivaram
- Ultrafast X-Ray Science Lab, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - D S Slaughter
- Ultrafast X-Ray Science Lab, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - P Ranitovic
- Ultrafast X-Ray Science Lab, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - A Belkacem
- Ultrafast X-Ray Science Lab, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Th Weber
- Ultrafast X-Ray Science Lab, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
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7
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Tang X, Garcia GA, Gil JF, Nahon L. Vacuum upgrade and enhanced performances of the double imaging electron/ion coincidence end-station at the vacuum ultraviolet beamline DESIRS. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2015; 86:123108. [PMID: 26724007 DOI: 10.1063/1.4937624] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We report here the recent upgrade of the SAPHIRS permanent photoionization end-station at the DESIRS vacuum ultraviolet beamline of synchrotron SOLEIL, whose performances have been enhanced by installing an additional double-skimmer differential chamber. The smaller molecular beam profile obtained at the interaction region has increased the mass resolution of the double imaging photoelectron photoion coincidence (i(2)PEPICO) spectrometer, DELICIOUS III, installed in the photoionization chamber of the SAPHIRS endstation, by a factor of two, to M/ΔM ∼ 1700 (FWHM). The electron kinetic energy resolution offered by the velocity map imaging (VMI) part of the spectrometer has been improved down to 2.8% (ΔE/E) as we show on the N2 photoionization case in the double skimmer configuration. As a representative example of the overall state-of-the-art i(2)PEPICO performances, experimental results of the dissociation of state-selected O2(+)(B(2)∑(g)(-), v(+) = 0-6) molecular ions performed at the fixed photon energy of hν = 21.1 eV are presented.
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Affiliation(s)
- Xiaofeng Tang
- Synchrotron SOLEIL, L'Orme des Merisiers, St. Aubin BP 48, 91192 Gif sur Yvette, France
| | - Gustavo A Garcia
- Synchrotron SOLEIL, L'Orme des Merisiers, St. Aubin BP 48, 91192 Gif sur Yvette, France
| | - Jean-François Gil
- Synchrotron SOLEIL, L'Orme des Merisiers, St. Aubin BP 48, 91192 Gif sur Yvette, France
| | - Laurent Nahon
- Synchrotron SOLEIL, L'Orme des Merisiers, St. Aubin BP 48, 91192 Gif sur Yvette, France
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8
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Cunha de Miranda B, Romanzin C, Chefdeville S, Vuitton V, Žabka J, Polášek M, Alcaraz C. Reactions of State-Selected Atomic Oxygen Ions O(+)((4)S, (2)D, (2)P) with Methane. J Phys Chem A 2015; 119:6082-98. [PMID: 25721439 DOI: 10.1021/jp512846v] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An experimental study has been carried out on the reactions of state selected O(+)((4)S, (2)D, (2)P) ions with methane with the aims of characterizing the effects of both the parent ion internal energy and collision energy on the reaction dynamics and determining the fate of oxygen species in complex media, in particular the Titan ionosphere. Absolute cross sections and product velocity distributions have been determined for the reactions of (16)O(+) or (18)O(+) ions with CH4 or CD4 from thermal to 5 eV collision energies by using the guided ion beam (GIB) technique. Dissociative photoionization of O2 with vacuum ultraviolet (VUV) synchrotron radiation delivered by the DESIRS beamline at the SOLEIL storage ring and the threshold photoion photoelectron coincidence (TPEPICO) technique are used for the preparation of purely state-selected O(+)((4)S, (2)D, (2)P) ions. A complete inversion of the product branching ratio between CH4(+) and CH3(+) ions in favor of the latter is observed for excitation of O(+) ions from the (4)S ground state to either the (2)D or the (2)P metastable state. CH4(+) and CH3(+) ions, which are by far the major products for the reaction of ground state and excited states, are strongly backward scattered in the center of mass frame relative to O(+) parent ions. For the reaction of O(+)((4)S), CH3(+) production also rises with increasing collision energy but with much less efficiency than with O(+) excitation. We found that a mechanism of dissociative charge transfer, mediated by an initial charge transfer step, can account very well for all the observations, indicating that CH3(+) production is associated with the formation of H and O atoms (CH3(+) + H + O) rather than with OH formation by an hydride transfer process (CH3(+) + OH). Therefore, as the CH4(+) production by charge transfer is also associated with O atoms, the fate of oxygen species in these reactions is essentially the O production, except for the reaction of O(+)((4)S), which also produces appreciable amounts of H2O(+) ions but only at very low collision energy. The production of O atoms and the nature of the states in which they are formed are discussed for the reactions of O(+) ions with CH4 and N2.
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Affiliation(s)
- Barbara Cunha de Miranda
- †Laboratoire de Chimie Physique, UMR 8000 CNRS-Univ. Paris Sud, Bât. 350, FR-91405 Orsay Cedex, France.,‡Laboratório de Espectroscopia e Laser, Instituto de Física, Universidade Federal Fluminense, Av. Gal. Milton Tavares de Souza, Boa Viagem, Niterói, RJ BR-24210-340, Brazil.,§Synchrotron SOLEIL, L'Orme des Merisiers, BP 48, St Aubin, FR-91192 Gif sur Yvette, France
| | - Claire Romanzin
- †Laboratoire de Chimie Physique, UMR 8000 CNRS-Univ. Paris Sud, Bât. 350, FR-91405 Orsay Cedex, France
| | - Simon Chefdeville
- †Laboratoire de Chimie Physique, UMR 8000 CNRS-Univ. Paris Sud, Bât. 350, FR-91405 Orsay Cedex, France
| | | | - Jan Žabka
- ⊥J. Heyrovský Institute of Physical Chemistry of the ASCR, v.v.i., Dolejškova 2155/3, 182 23 Prague 8, Czech Republic
| | - Miroslav Polášek
- ⊥J. Heyrovský Institute of Physical Chemistry of the ASCR, v.v.i., Dolejškova 2155/3, 182 23 Prague 8, Czech Republic
| | - Christian Alcaraz
- †Laboratoire de Chimie Physique, UMR 8000 CNRS-Univ. Paris Sud, Bât. 350, FR-91405 Orsay Cedex, France.,§Synchrotron SOLEIL, L'Orme des Merisiers, BP 48, St Aubin, FR-91192 Gif sur Yvette, France
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9
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Janssen MHM, Powis I. Detecting chirality in molecules by imaging photoelectron circular dichroism. Phys Chem Chem Phys 2014; 16:856-71. [DOI: 10.1039/c3cp53741b] [Citation(s) in RCA: 114] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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10
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Bomme C, Guillemin R, Marin T, Journel L, Marchenko T, Dowek D, Trcera N, Pilette B, Avila A, Ringuenet H, Kushawaha RK, Simon M. Double momentum spectrometer for ion-electron vector correlations in dissociative photoionization. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2013; 84:103104. [PMID: 24182098 DOI: 10.1063/1.4824194] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We have developed a new momentum spectrometer dedicated to momentum vector correlations in the context of deep core photoionization of atomic and molecular species in the gas phase. In this article, we describe the design and operation of the experimental setup. The capabilities of the apparatus are illustrated with a set of measurements done on the sulphur core 1s photoionization of gas-phase CS2.
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Affiliation(s)
- C Bomme
- UPMC, Université Paris 06, CNRS, UMR 7614, Laboratoire de Chimie Physique Matière et Rayonnement, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05, France
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11
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The design and performance of a velocity map imaging spectrometer for the study of molecular photoionisation dynamics. Chem Phys 2012. [DOI: 10.1016/j.chemphys.2012.09.020] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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12
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Tang X, Zhou X, Wu M, Cai Y, Liu S, Sheng L. Direct Experimental Evidence for Dissociative Photoionization of Oxygen Molecule via 2Σu– Ionic “Optical Dark” State. J Phys Chem A 2012; 116:9459-65. [DOI: 10.1021/jp3034038] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xiaofeng Tang
- Hefei National Laboratory for
Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei,
Anhui 230026, China
- National
Synchrotron Radiation
Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, China
| | - Xiaoguo Zhou
- Hefei National Laboratory for
Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei,
Anhui 230026, China
| | - Manman Wu
- Hefei National Laboratory for
Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei,
Anhui 230026, China
| | - Yu Cai
- Hefei National Laboratory for
Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei,
Anhui 230026, China
| | - Shilin Liu
- Hefei National Laboratory for
Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei,
Anhui 230026, China
| | - Liusi Sheng
- National
Synchrotron Radiation
Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, China
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13
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Doughty B, Koh CJ, Haber LH, Leone SR. Ultrafast decay of superexcited c 4Σu- nlσg v=0,1 states of O2 probed with femtosecond photoelectron spectroscopy. J Chem Phys 2012; 136:214303. [PMID: 22697539 DOI: 10.1063/1.4722924] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Neutral superexcited states in molecular oxygen converging to the O(2)(+) c (4)Σ(u)(-) ion state are excited and probed with femtosecond time-resolved photoelectron spectroscopy to investigate predissociation and autoionization relaxation channels as the superexcited states decay. The c (4)Σ(u)(-) 4sσ(g) v=0, c (4)Σ(u)(-) 4sσ(g) v=1, and c (4)Σ(u)(-) 3dσ(g) v=1 superexcited states are prepared with pulsed high-harmonic radiation centered at 23.10 eV. A time-delayed 805 nm laser pulse is used to probe the excited molecular states and neutral atomic fragments by ionization; the ejected photoelectrons from these states are spectrally resolved with a velocity map imaging spectrometer. Three excited neutral O* atom products are identified in the photoelectron spectrum as 4d(1) (3)D(J)°, 4p(1) (5)P(J)° and 3d(1) (3)D(J)° fragments. Additionally, several features in the photoelectron spectrum are assigned to photoionization of the transiently populated superexcited states. Using principles of the ion core dissociation model, the atomic fragments measured are correlated with the molecular superexcited states from which they originate. The 4d(1) (3)D(J)° fragment is observed to be formed on a timescale of 65 ± 5 fs and is likely a photoproduct of the 4sσ(g) v = 1 state. The 4p(1) (5)P(J)° fragment is formed on a timescale of 427 ± 75 fs and correlated with the neutral predissociation of the 4sσ(g) v = 0 state. The timescales represent the sum of predissociation and autoionization decay rates for the respective superexcited state. The production of the 3d(1) (3)D(J)° fragment is not unambiguously resolved in time due to an overlapping decay of a v = 1 superexcited state photoelectron signal. The observed 65 fs timescale is in good agreement with previous experiments and theory on the predissociation lifetimes of the v = 1 ion state, suggesting that predissociation may dominate the decay dynamics from the v = 1 superexcited states. An unidentified molecular state is inferred by the detection of a long-lived depletion signal (reduction in autoionization) associated with the B (2)Σ(g)(-) ion state that persists up to time delays of 105 ps.
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Affiliation(s)
- Benjamin Doughty
- Department of Chemistry and Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA
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14
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Lebech M, Houver JC, Raseev G, dos Santos AS, Dowek D, Lucchese RR. Valence and inner-valence shell dissociative photoionization of CO in the 26–33 eV range. II. Molecular-frame and recoil-frame photoelectron angular distributions. J Chem Phys 2012; 136:094303. [DOI: 10.1063/1.3681920] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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15
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Tang X, Zhou X, Niu M, Liu S, Sheng L. Dissociation of Vibrational State-Selected O2+ Ions in the B2Σg¯ State Using Threshold Photoelectron–Photoion Coincidence Velocity Imaging. J Phys Chem A 2011; 115:6339-46. [DOI: 10.1021/jp111590s] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Xiaofeng Tang
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Xiaoguo Zhou
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Mingli Niu
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Shilin Liu
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Liusi Sheng
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, China
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16
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Vredenborg A, Lehmann CS, Irimia D, Roeterdink WG, Janssen MHM. The Reaction Microscope: Imaging and Pulse Shaping Control in Photodynamics. Chemphyschem 2011; 12:1459-73. [DOI: 10.1002/cphc.201100107] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2011] [Indexed: 11/09/2022]
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17
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18
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Lebech M, Houver JC, Dowek D. Valence and inner-valence shell dissociative photoionization of CO in the 26-33 eV range. I. Ion-electron kinetic energy correlation and laboratory frame photoemission. J Chem Phys 2009; 130:194307. [PMID: 19466836 DOI: 10.1063/1.3125223] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The (V(A+), V(e), ê) vector correlation method, combining imaging and time-of-flight resolved electron-ion coincidence techniques, is used to probe dissociative photoionization (DPI) of CO induced by vacuum ultra violet linearly or circularly polarized synchrotron radiation in the 26-33 eV photon excitation energy range. It provides original information about both the photoionization dynamics of the CO molecule and the dissociation dynamics of the CO(+) molecular ions. The explored region corresponds to valence and inner-valence CO(+) ionic states, which involve doubly or multiply excited electronic configurations. In this paper I we identify up to 17 DPI reaction pathways by the position of the intermediate CO(+) molecular states in the Franck-Condon region and the (C(+) + O) or (O(+) + C) dissociation limits to which they correlate. For these processes we report the laboratory frame beta(C+/O+) and beta(e) asymmetry parameters as well as the relative branching ratios in selected binding energy bands. The I(chi,theta(e),phi(e)) molecular frame photoelectron angular distributions for selected PI processes will be reported in a companion paper II and compared with multichannel Schwinger configuration interaction ab initio calculations of these observables.
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Affiliation(s)
- M Lebech
- UMR 8625 and CNRS, Laboratoire des Collisions Atomiques et Moléculaires, Bat 351, Université Paris-Sud, 91405 Orsay, France
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Alcaraz C, Nicolas C, Thissen R, Zabka J, Dutuit O. 15N+ + CD4 and O+ + 13CO2 State-Selected Ion−Molecule Reactions Relevant to the Chemistry of Planetary Ionospheres. J Phys Chem A 2004. [DOI: 10.1021/jp0477755] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Christian Alcaraz
- LURE, UMR 130, Bât. 209D, Centre Universitaire Paris-Sud, 91898 Orsay Cedex, Laboratoire de Chimie Physique, UMR 8000, Bât. 350, Centre Universitaire Paris-Sud, 91405 Orsay, France, and J. Heyrovsky Institute of Physical Chemistry, Dolejskova 3, CZ 18223 Praha 8 - Kobylisy, Czech Republic
| | - Christophe Nicolas
- LURE, UMR 130, Bât. 209D, Centre Universitaire Paris-Sud, 91898 Orsay Cedex, Laboratoire de Chimie Physique, UMR 8000, Bât. 350, Centre Universitaire Paris-Sud, 91405 Orsay, France, and J. Heyrovsky Institute of Physical Chemistry, Dolejskova 3, CZ 18223 Praha 8 - Kobylisy, Czech Republic
| | - Roland Thissen
- LURE, UMR 130, Bât. 209D, Centre Universitaire Paris-Sud, 91898 Orsay Cedex, Laboratoire de Chimie Physique, UMR 8000, Bât. 350, Centre Universitaire Paris-Sud, 91405 Orsay, France, and J. Heyrovsky Institute of Physical Chemistry, Dolejskova 3, CZ 18223 Praha 8 - Kobylisy, Czech Republic
| | - Jan Zabka
- LURE, UMR 130, Bât. 209D, Centre Universitaire Paris-Sud, 91898 Orsay Cedex, Laboratoire de Chimie Physique, UMR 8000, Bât. 350, Centre Universitaire Paris-Sud, 91405 Orsay, France, and J. Heyrovsky Institute of Physical Chemistry, Dolejskova 3, CZ 18223 Praha 8 - Kobylisy, Czech Republic
| | - Odile Dutuit
- LURE, UMR 130, Bât. 209D, Centre Universitaire Paris-Sud, 91898 Orsay Cedex, Laboratoire de Chimie Physique, UMR 8000, Bât. 350, Centre Universitaire Paris-Sud, 91405 Orsay, France, and J. Heyrovsky Institute of Physical Chemistry, Dolejskova 3, CZ 18223 Praha 8 - Kobylisy, Czech Republic
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Kugeler O, Prümper G, Hentges R, Viefhaus J, Rolles D, Becker U, Marburger S, Hergenhahn U. Intramolecular electron scattering and electron transfer following autoionization in dissociating molecules. PHYSICAL REVIEW LETTERS 2004; 93:033002. [PMID: 15323819 DOI: 10.1103/physrevlett.93.033002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2004] [Indexed: 05/24/2023]
Abstract
Resonant Auger decay of core-excited molecules during ultrafast dissociation leads to a Doppler shift of the emitted electrons depending on the direction of the electron emission relative to the dissociation axis. We have investigated this process by angle-resolved electron-fragment ion coincidence spectroscopy. Electron energy spectra for selected emission angles for the electron relative to the molecular axis reveal the occurrence of intermolecular electron scattering and electron transfer following the primary emission. These processes amount to approximately 25% of the resonant atomic Auger intensity emitted in the studied transition.
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Affiliation(s)
- O Kugeler
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
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Lebech M, Houver JC, Dowek D, Lucchese RR. Dissociative photoionization of N2O in the region of the N2O+(B 2Π) state studied by ion–electron velocity vector correlation. J Chem Phys 2004; 120:8226-40. [PMID: 15267743 DOI: 10.1063/1.1651087] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Dissociative direct photoionization of the N2O(X 1Sigma+) linear molecule via the N2O+(B 2Pi) ionic state induced by linearly polarized synchrotron radiation P in the 18-22 eV photon energy range is investigated using the (VA+,Ve,P) vector correlation method, where VA+ is the nascent velocity vector of the NO+, N2+, or O+ ionic fragment and Ve that of the photoelectron. The DPI processes are identified by the ion-electron kinetic energy correlation, and the IchiA+(thetae,phie) molecular frame photoelectron angular distributions (MFPADs) are reported for the dominant reaction leading to NO+ (X 1Sigma+,v) + N(2D)+ e. The measured MFPADs are found in satisfactory agreement with the reported multichannel Schwinger configuration interaction calculations, when bending of the N2O+(B 2Pi) molecular ion prior to dissociation is taken into account. A significant evolution of the electron scattering anisotropies is observed, in particular in the azimuthal dependence of the MFPADs, characteristic of a photoionization transition between a neutral state of Sigma symmetry and an ionic state of Pi symmetry. This interpretation is supported by a simple model describing the photoionization transition by the coherent superposition of two ssigma and ddelta partial waves and the associated Coulomb phases.
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Affiliation(s)
- M Lebech
- Laboratoire des Collisions Atomiques et Moleculaires (L.C.A.M., UMR Universite Paris Sud et CNRS, No. 8625), Batiment 351, Universite Paris Sud, F-91405 Orsay Cedex, France
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Lebech M, Houver JC, Lafosse A, Dowek D, Alcaraz C, Nahon L, Lucchese RR. Complete description of linear molecule photoionization achieved by vector correlations using the light of a single circular polarization. J Chem Phys 2003. [DOI: 10.1063/1.1570402] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Lebech M, Houver JC, Dowek D, Lucchese RR. Dissociative photoionization of N2O in the region of the N2O+(C 2Σ+) state, studied by ion–electron velocity vector correlation. J Chem Phys 2002. [DOI: 10.1063/1.1515765] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Lafosse A, Brenot JC, Guyon PM, Houver JC, Golovin AV, Lebech M, Dowek D, Lin P, Lucchese RR. Vector correlations in dissociative photoionization of O2 in the 20–28 eV range. II. Polar and azimuthal dependence of the molecular frame photoelectron angular distribution. J Chem Phys 2002. [DOI: 10.1063/1.1512650] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Lin P, Lucchese RR. Theoretical studies of cross sections and photoelectron angular distributions in the valence photoionization of molecular oxygen. J Chem Phys 2002. [DOI: 10.1063/1.1467902] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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