1
|
Taleb AA, Schiller F, Vyalikh DV, María Pérez J, Auras SV, Farías D, Ortega JE. Simulating high-pressure surface reactions with molecular beams. Phys Chem Chem Phys 2024; 26:1770-1776. [PMID: 38168970 DOI: 10.1039/d3cp05071h] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
Using a reactive molecular beam with high kinetic energy (Ekin), it is possible to speed gas-surface reactions involving high activation barriers (Eact), which would require elevated pressures (P0) if a random gas with a Maxwell-Boltzmann distribution is used. By simply computing the number of molecules that overcome the activation barrier in a random gas at P0 and in a molecular beam at Ekin = Eact, we establish an Ekin-P0 equivalence curve, through which we postulate that molecular beams are ideal tools to investigate gas-surface reactions that involve high activation energies. In particular, we foresee the use of molecular beams to simulate gas surface reactions within the industrial-range (>10 bar) using surface-sensitive ultra-high vacuum (UHV) techniques, such as X-ray photoemission spectroscopy (XPS). To test this idea, we revisit the oxidation of the Cu(111) surface combining O2 molecular beams and XPS experiments. By tuning the kinetic energy of the O2 beam in the range of 0.24-1 eV, we achieve the same sequence of surface oxides obtained in ambient pressure photoemission (AP-XPS) experiments, in which the Cu(111) surface was exposed to a random O2 gas up to 1 mbar. We observe the same surface oxidation kinetics as in the random gas, but with a much lower dose, close to the expected value derived from the equivalence curve.
Collapse
Affiliation(s)
- Amjad Al Taleb
- Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Cantoblanco Madrid, Spain
| | - Frederik Schiller
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, E-20018 San Sebastián, Spain.
| | - Denis V Vyalikh
- Donostia International Physics Center, E-20018 Donostia-San Sebastián, Spain
- IKERBASQUE, Basque Foundation for Science, 48013, Bilbao, Spain
| | - José María Pérez
- Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Cantoblanco Madrid, Spain
| | - Sabine V Auras
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, E-20018 San Sebastián, Spain.
- Universidad del País Vasco, Dpto. Física Aplicada, E-20018 San Sebastián, Spain
| | - Daniel Farías
- Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Cantoblanco Madrid, Spain
- Instituto "Nicolás Cabrera", Universidad Autónoma de Madrid, 28049 Madrid, Spain
- Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - J Enrique Ortega
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, E-20018 San Sebastián, Spain.
- Donostia International Physics Center, E-20018 Donostia-San Sebastián, Spain
- Universidad del País Vasco, Dpto. Física Aplicada, E-20018 San Sebastián, Spain
| |
Collapse
|
2
|
Al Taleb A, Miranda R, Farías D. Time-of-flight measurements of the low-energy scattering of CH 4 from Ir(111). Phys Chem Chem Phys 2021; 23:7830-7836. [PMID: 33196712 DOI: 10.1039/d0cp05416j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have measured high-resolution time-of-flight (TOF) spectra of methane scattered from an Ir(111) surface at an incident energy of 81 meV. The angular distributions of scattered CH4 reveal the presence of a sharp and intense specular peak in addition to sharp features corresponding to rotationally inelastic diffraction (RID) peaks along the two main symmetry directions of Ir(111). TOF spectra have been recorded at several RID positions for the two high-symmetry directions. The data show that the scattering dynamics of CH4 is more complex than the one reported for H2/D2, where energy losses in TOF correspond to the expected excitation/deexcitation RID energy transitions. For CH4, this is the case only for RID peaks showing up far from the specular peak, whereas those appearing close to the specular position present different behaviors, depending on the incident direction. The results are compared with Ne scattering TOF data, which allows to assess the relevance of multiphonon scattering in the energy-exchange process. Finally, we report experimental evidence of selective adsorption resonances detected with CH4 beams. This will allow characterizing the CH4-metal surface physisorption well by measuring angular distributions with CH4 beams.
Collapse
Affiliation(s)
- Amjad Al Taleb
- Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | | | | |
Collapse
|
3
|
Benedek G, Bernasconi M, Campi D, Silkin IV, Chernov IP, Silkin VM, Chulkov EV, Echenique PM, Toennies JP, Anemone G, Al Taleb A, Miranda R, Farías D. Evidence for a spin acoustic surface plasmon from inelastic atom scattering. Sci Rep 2021; 11:1506. [PMID: 33452337 PMCID: PMC7810840 DOI: 10.1038/s41598-021-81018-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Accepted: 12/29/2020] [Indexed: 11/09/2022] Open
Abstract
Closed-shell atoms scattered from a metal surface exchange energy and momentum with surface phonons mostly via the interposed surface valence electrons, i.e., via the creation of virtual electron-hole pairs. The latter can then decay into surface phonons via electron-phonon interaction, as well as into acoustic surface plasmons (ASPs). While the first channel is the basis of the current inelastic atom scattering (IAS) surface-phonon spectroscopy, no attempt to observe ASPs with IAS has been made so far. In this study we provide evidence of ASP in Ni(111) with both Ne atom scattering and He atom scattering. While the former measurements confirm and extend so far unexplained data, the latter illustrate the coupling of ASP with phonons inside the surface-projected phonon continuum, leading to a substantial reduction of the ASP velocity and possibly to avoided crossing with the optical surface phonon branches. The analysis is substantiated by a self-consistent calculation of the surface response function to atom collisions and of the first-principle surface-phonon dynamics of Ni(111). It is shown that in Ni(111) ASP originate from the majority-spin Shockley surface state and are therefore collective oscillation of surface electrons with the same spin, i.e. it represents a new kind of collective quasiparticle: a Spin Acoustic Surface Plasmon (SASP).
Collapse
Affiliation(s)
- G Benedek
- Dipartimento di Scienza dei Materiali, Universitá di Milano-Bicocca, Via R. Cozzi 55, 20125, Milan, Italy.,Donostia International Physics Center (DIPC), 20018, San Sebastián/Donostia, Basque Country, Spain
| | - M Bernasconi
- Dipartimento di Scienza dei Materiali, Universitá di Milano-Bicocca, Via R. Cozzi 55, 20125, Milan, Italy
| | - D Campi
- Dipartimento di Scienza dei Materiali, Universitá di Milano-Bicocca, Via R. Cozzi 55, 20125, Milan, Italy.,École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland
| | - I V Silkin
- Tomsk State University, 634050, Tomsk, Russia
| | - I P Chernov
- Engineering School of Nuclear Technology, Tomsk Polytechnic University, 634050, Tomsk, Russia
| | - V M Silkin
- Donostia International Physics Center (DIPC), 20018, San Sebastián/Donostia, Basque Country, Spain.,Departamento de Polímeros y Materiales Avanzados: Física, Química y Tecnología, Facultad de Ciencias Químicas, Universidad del País Vasco UPV/EHU, 20080, San Sebastián/Donostia, Basque Country, Spain.,IKERBASQUE, Basque Foundation for Science, 48013, Bilbao, Basque Country, Spain
| | - E V Chulkov
- Donostia International Physics Center (DIPC), 20018, San Sebastián/Donostia, Basque Country, Spain.,Departamento de Polímeros y Materiales Avanzados: Física, Química y Tecnología, Facultad de Ciencias Químicas, Universidad del País Vasco UPV/EHU, 20080, San Sebastián/Donostia, Basque Country, Spain.,Centro de Fisica de Materiales, Centro Mixto CSIC-UPV/EHU, 20018, San Sebastian/Donostia, Basque Country, Spain.,St. Petersburg State University, 198504, St. Petersburg, Russia
| | - P M Echenique
- Donostia International Physics Center (DIPC), 20018, San Sebastián/Donostia, Basque Country, Spain.,Departamento de Polímeros y Materiales Avanzados: Física, Química y Tecnología, Facultad de Ciencias Químicas, Universidad del País Vasco UPV/EHU, 20080, San Sebastián/Donostia, Basque Country, Spain.,Centro de Fisica de Materiales, Centro Mixto CSIC-UPV/EHU, 20018, San Sebastian/Donostia, Basque Country, Spain
| | - J P Toennies
- Max-Planck-Institut für Dynamik und Selbstorganisation, Bunsenstraße 10, 37073, Göttingen, Germany
| | - G Anemone
- Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049, Madrid, Spain
| | - A Al Taleb
- Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049, Madrid, Spain
| | - R Miranda
- Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049, Madrid, Spain.,Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), 28049, Madrid, Spain.,Instituto "Nicolás Cabrera", Universidad Autónoma de Madrid, 28049, Madrid, Spain.,Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, 28049, Madrid, Spain
| | - D Farías
- Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049, Madrid, Spain. .,Instituto "Nicolás Cabrera", Universidad Autónoma de Madrid, 28049, Madrid, Spain. .,Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, 28049, Madrid, Spain.
| |
Collapse
|
4
|
Shimizu K, Diño WA, Nakanishi H, Kasai H, Takeyasu K, Fukutani K, Yajima A. Dynamical Quantum Filtering via Enhanced Scattering of para-H 2 on the Orientationally Anisotropic Potential of SrTiO 3(001). Sci Rep 2020; 10:5939. [PMID: 32246021 PMCID: PMC7125136 DOI: 10.1038/s41598-020-62605-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Accepted: 03/17/2020] [Indexed: 11/29/2022] Open
Abstract
Quantum dynamics calculation, performed on top of density functional theory (DFT)-based total energy calculations, show dynamical quantum filtering via enhanced scattering of para-H2 on SrTiO3(001). We attribute this to the strongly orientation-dependent (electrostatic) interaction potential between the H2 (induced) quadrupole moment and the surface electric field gradient of ionic SrTiO3(001). These results suggest that ionic surfaces could function as a scattering/filtering media to realize rotationally state-resolved H2. This could find significant applications not only in H2 storage and transport, but also in realizing materials with pre-determined characteristic properties.
Collapse
Grants
- 17K06818 Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- 17H01057 Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- 15H05736 Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- 15KT0062 Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- New Energy and Industrial Technology Development Organization (NEDO)
Collapse
Affiliation(s)
- Koji Shimizu
- Department of Applied Physics, Osaka University, Osaka, 565-0871, Japan
| | - Wilson Agerico Diño
- Department of Applied Physics, Osaka University, Osaka, 565-0871, Japan.
- Center for Atomic and Molecular Technologies, Osaka University, Osaka, 565-0871, Japan.
| | - Hiroshi Nakanishi
- Department of Applied Physics, Osaka University, Osaka, 565-0871, Japan
- National Institute of Technology, Akashi College, Hyogo, 674-8501, Japan
| | - Hideaki Kasai
- Department of Applied Physics, Osaka University, Osaka, 565-0871, Japan
- National Institute of Technology, Akashi College, Hyogo, 674-8501, Japan
- Institute of Industrial Science, The University of Tokyo, Tokyo, 153-8505, Japan
| | - Kotaro Takeyasu
- Institute of Industrial Science, The University of Tokyo, Tokyo, 153-8505, Japan
| | - Katsuyuki Fukutani
- Institute of Industrial Science, The University of Tokyo, Tokyo, 153-8505, Japan
| | - Ayako Yajima
- Kawasaki Heavy Industries, Ltd., Hyogo, 673-8666, Japan
| |
Collapse
|
5
|
Del Cueto M, Muzas AS, Frankcombe TJ, Martín F, Díaz C. Prominent out-of-plane diffraction in helium scattering from a methyl-terminated Si(111) surface. Phys Chem Chem Phys 2019; 21:15879-15887. [PMID: 31286123 DOI: 10.1039/c9cp02141h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Due to their electrochemical and oxidative stability, organic-terminated semiconductor surfaces are well suited to applications in, for example, photoelectrodes and electrochemical cells, which explains the lively interest in their detailed characterization. Helium atom scattering (HAS) is a useful tool to carry out such characterization. Here, we have simulated HAS in He/CH3-Si(111) based on density functional theory (DFT) potential energy surfaces (PESs) and multi-configuration time-dependent Hartree (MCTDH) dynamics. Our analysis of HAS shows that most diffraction taking place in this system corresponds to high-order out-of-plane peaks. This is a general trend that does not depend on the specific features of the simulations, such as the inclusion or not of the van der Waals long-range effects. This is the first and only He-surface system for which such huge out-of-plane diffraction has been described. This striking theoretical finding should encourage new experimental developments to confirm this previously unreported effect.
Collapse
Affiliation(s)
- Marcos Del Cueto
- Departamento de Química Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
| | - Alberto S Muzas
- University of New South Wales, Canberra, ACT 2600, Australia
| | | | - Fernando Martín
- Departamento de Química Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain. and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, 28049 Madrid, Spain and Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), Cantoblanco, 28049 Madrid, Spain
| | - Cristina Díaz
- Departamento de Química Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain. and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, 28049 Madrid, Spain and Institute for Advanced Research in Chemistry (IAdChem), Universidad Autónoma de Madrid, 28049 Madrid, Spain
| |
Collapse
|
6
|
Del Cueto M, Maurer RJ, Al Taleb A, Farías D, Martín F, Díaz C. Performance of van der Waals DFT approaches for helium diffraction on metal surfaces. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:135901. [PMID: 30625425 DOI: 10.1088/1361-648x/aafcfd] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The ability of the different approaches proposed to date to include the effects of van der Waals (vdW) dispersion forces in density functional theory (DFT) is currently under debate. Here, we used the diffraction of He on a Ru(0 0 0 1) surface as a challenging benchmark system to analyze the suitability of several representative approaches, from the ones correcting the exchange-correlation generalized gradient approximation (GGA) functional, to the ones correcting the DFT energies through pairwise-based methods. To perform our analysis, we have built seven continuous potential energy surfaces (PESs) and carried out quantum dynamics simulations using a multi-configuration time-dependent Hartree method. Our analysis reveals that standard DFT within the PBE-GGA framework, although it overestimates diffraction probabilities, yields the best results in comparison with available experimental measurements. On the other hand, although several of the existing vdW DFT approaches yield physisorption wells in very good agreement with experiment, they all seem to overestimate the long-distance corrugation of the PES, the region probed by He scattering, resulting in a large overestimation of diffraction probabilities.
Collapse
Affiliation(s)
- Marcos Del Cueto
- Departamento de Química Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | | | | | | | | | | |
Collapse
|
7
|
Kondo T, Al Taleb A, Anemone G, Farías D. Low-energy methane scattering from Pt(111). J Chem Phys 2018; 149:084703. [PMID: 30193506 DOI: 10.1063/1.5044744] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We have measured the temperature dependence of angular distributions of CH4 from Pt(111) at an incident energy of 109 meV. A broad angular distribution has been observed along the two main symmetry directions, whereby the peak center shifts from the supra-specular position to the sub-specular position when the surface temperature increases from 120 K to 800 K. Different widths have been measured for the scattering patterns along the [ 1¯01 ] and the [ 2¯11 ] azimuthal directions. Based on calculations performed within the binary collision model, these differences have been ascribed to different corrugations of the CH4-Pt(111) interaction potential along the two high-symmetry directions. This corrugation has been estimated from the model calculations to amount ∼0.03 Å, a factor of three larger than the one measured with helium diffraction.
Collapse
Affiliation(s)
- Takahiro Kondo
- Department of Materials Science and Tsukuba Research Center for Energy Materials Science, Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan
| | - Amjad Al Taleb
- Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Gloria Anemone
- Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Daniel Farías
- Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| |
Collapse
|
8
|
Al Taleb A, Farías D. Coherent quantum scattering of CH 4 from Ni(111). Phys Chem Chem Phys 2017; 19:21267-21271. [PMID: 28762404 DOI: 10.1039/c7cp04559j] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have measured high-resolution angular distributions of methane scattered from a Ni(111) surface at incident energies between 68.9 meV and 108.6 meV. A sharp and intense specular peak has been observed, in addition to sharp features corresponding to rotationally inelastic diffraction (RID) peaks along the two main symmetry directions of Ni(111). The intensity of the most intense RID peaks is ca. 50% of the specular one. The observation of sharp, coherent elastic peaks at such low incident energies suggests that single scattering dominates over trapping at these energies, and that the depth of the van der Waals well should be lower than 60 meV. In contrast, a broad angular distribution shifted from the specular position is observed from a graphene-covered Ni(111) surface under identical incident conditions. These results open up the possibility of studying the physisorption well between CH4 and a transition metal surface using high-resolution molecular beams.
Collapse
Affiliation(s)
- Amjad Al Taleb
- Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | | |
Collapse
|
9
|
Nihill KJ, Hund ZM, Muzas A, Díaz C, Del Cueto M, Frankcombe T, Plymale NT, Lewis NS, Martín F, Sibener SJ. Experimental and theoretical study of rotationally inelastic diffraction of H2(D2) from methyl-terminated Si(111). J Chem Phys 2016; 145:084705. [PMID: 27586939 DOI: 10.1063/1.4961257] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Fundamental details concerning the interaction between H2 and CH3-Si(111) have been elucidated by the combination of diffractive scattering experiments and electronic structure and scattering calculations. Rotationally inelastic diffraction (RID) of H2 and D2 from this model hydrocarbon-decorated semiconductor interface has been confirmed for the first time via both time-of-flight and diffraction measurements, with modest j = 0 → 2 RID intensities for H2 compared to the strong RID features observed for D2 over a large range of kinematic scattering conditions along two high-symmetry azimuthal directions. The Debye-Waller model was applied to the thermal attenuation of diffraction peaks, allowing for precise determination of the RID probabilities by accounting for incoherent motion of the CH3-Si(111) surface atoms. The probabilities of rotationally inelastic diffraction of H2 and D2 have been quantitatively evaluated as a function of beam energy and scattering angle, and have been compared with complementary electronic structure and scattering calculations to provide insight into the interaction potential between H2 (D2) and hence the surface charge density distribution. Specifically, a six-dimensional potential energy surface (PES), describing the electronic structure of the H2(D2)/CH3-Si(111) system, has been computed based on interpolation of density functional theory energies. Quantum and classical dynamics simulations have allowed for an assessment of the accuracy of the PES, and subsequently for identification of the features of the PES that serve as classical turning points. A close scrutiny of the PES reveals the highly anisotropic character of the interaction potential at these turning points. This combination of experiment and theory provides new and important details about the interaction of H2 with a hybrid organic-semiconductor interface, which can be used to further investigate energy flow in technologically relevant systems.
Collapse
Affiliation(s)
- Kevin J Nihill
- The James Franck Institute and Department of Chemistry, The University of Chicago, 929 E. 57th Street, Chicago, Illinois 60637, USA
| | - Zachary M Hund
- The James Franck Institute and Department of Chemistry, The University of Chicago, 929 E. 57th Street, Chicago, Illinois 60637, USA
| | - Alberto Muzas
- Departamento de Química, Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Cristina Díaz
- Departamento de Química, Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Marcos Del Cueto
- Departamento de Química, Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Terry Frankcombe
- School of Physical, Environmental and Mathematical Sciences, University of New South Wales, Canberra ACT 2610, Australia
| | - Noah T Plymale
- Division of Chemistry and Chemical Engineering, Beckman Institute and Kavli Nanoscience Institute, California Institute of Technology, 210 Noyes Laboratory, 127-72, Pasadena, California 91125, USA
| | - Nathan S Lewis
- Division of Chemistry and Chemical Engineering, Beckman Institute and Kavli Nanoscience Institute, California Institute of Technology, 210 Noyes Laboratory, 127-72, Pasadena, California 91125, USA
| | - Fernando Martín
- Departamento de Química, Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - S J Sibener
- The James Franck Institute and Department of Chemistry, The University of Chicago, 929 E. 57th Street, Chicago, Illinois 60637, USA
| |
Collapse
|
10
|
Al Taleb A, Farías D. Phonon dynamics of graphene on metals. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:103005. [PMID: 26886508 DOI: 10.1088/0953-8984/28/10/103005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The study of surface phonon dispersion curves is motivated by the quest for a detailed understanding of the forces between the atoms at the surface and in the bulk. In the case of graphene, additional motivation comes from the fact that thermal conductivity is dominated by contributions from acoustic phonons, while optical phonon properties are essential to understand Raman spectra. In this article, we review recent progress made in the experimental determination of phonon dispersion curves of graphene grown on several single-crystal metal surfaces. The two main experimental techniques usually employed are high-resolution electron energy loss spectroscopy (HREELS) and inelastic helium atom scattering (HAS). The different dispersion branches provide a detailed insight into the graphene-substrate interaction. Softening of optical modes and signatures of the substrate's Rayleigh wave are observed for strong graphene-substrate interactions, while acoustic phonon modes resemble those of free-standing graphene for weakly interacting systems. The latter allows determining the bending rigidity and the graphene-substrate coupling strength. A comparison between theory and experiment is discussed for several illustrative examples. Perspectives for future experiments are discussed.
Collapse
Affiliation(s)
- Amjad Al Taleb
- Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | | |
Collapse
|
11
|
Kroes GJ, Díaz C. Quantum and classical dynamics of reactive scattering of H2 from metal surfaces. Chem Soc Rev 2016; 45:3658-700. [DOI: 10.1039/c5cs00336a] [Citation(s) in RCA: 120] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
State-of-the-art theoretical models allow nowadays an accurate description of H2/metal surface systems and phenomena relative to heterogeneous catalysis. Here we review the most relevant ones investigated during the last 10 years.
Collapse
Affiliation(s)
- Geert-Jan Kroes
- Leiden Institute of Chemistry
- Gorlaeus Laboratories
- Leiden University
- 2300 RA Leiden
- The Netherlands
| | - Cristina Díaz
- Departamento de Química
- Módulo 13
- Universidad Autónoma de Madrid
- 28049 Madrid
- Spain
| |
Collapse
|
12
|
Minniti M, Díaz C, Fernández Cuñado JL, Politano A, Maccariello D, Martín F, Farías D, Miranda R. Helium, neon and argon diffraction from Ru(0001). JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2012; 24:354002. [PMID: 22898880 DOI: 10.1088/0953-8984/24/35/354002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We present an experimental and theoretical study of He, Ne and Ar diffraction from the Ru(0001) surface. Close-coupling calculations were performed to estimate the corrugation function and the potential well depth in the atom-surface interaction in all three cases. DFT (density functional theory) calculations, including van der Waals dispersion forces, were used to validate the close-coupling results and to further analyze the experimental results. Our DFT calculations indicate that, in the incident energy range 20-150 meV, anticorrugating effects are present in the case of He and Ar diffraction, whereas normal corrugation is observed with Ne beams.
Collapse
Affiliation(s)
- M Minniti
- Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, Madrid, Spain
| | | | | | | | | | | | | | | |
Collapse
|
13
|
Nieto P, Barredo D, Farías D, Miranda R. In-Plane and Out-of-Plane Diffraction of H2 from Ru(001). J Phys Chem A 2011; 115:7283-90. [DOI: 10.1021/jp200502v] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pablo Nieto
- Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Daniel Barredo
- Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Daniel Farías
- Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049 Madrid, Spain
- Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), 28049 Madrid, Spain
| | - Rodolfo Miranda
- Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049 Madrid, Spain
- Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), 28049 Madrid, Spain
- Instituto de Ciencia de Materiales “Nicolás Cabrera”, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| |
Collapse
|
14
|
Laurent G, Barredo D, Farías D, Miranda R, Díaz C, Rivière P, Somers MF, Martín F. Experimental and theoretical study of rotationally inelastic diffraction of D2 from NiAl(110). Phys Chem Chem Phys 2010; 12:14501-7. [DOI: 10.1039/c0cp00431f] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|