1
|
Wang P, Gong S, Li Y, Mo Y. Bond dissociation energy of N2 measured by state-to-state resolved threshold fragment yield spectra. J Chem Phys 2024; 160:014304. [PMID: 38174795 DOI: 10.1063/5.0187003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Accepted: 12/11/2023] [Indexed: 01/05/2024] Open
Abstract
The precise determination of the bond dissociation energy of N2 is crucial for thermochemistry database and theoretical calculations. However, there has been ongoing debate regarding its exact value. In this study, we used the velocity map imaging method combined with an extreme ultraviolet laser to measure the threshold fragment yield (TFY) spectra of N2 in the N(2D) + N(2D) photodissociation channels. By integrating the signals within a small circular area on the fragment velocity map images, we were able to obtain TFY spectra at nine different dissociation thresholds. These spectra are rotational state-resolved for the N2(J″) molecules and spin-orbit state-resolved for the dissociation channels involving N(2D) fragments. By employing the Wigner threshold law to simulate the TFY spectra and conducting statistical analysis on the comprehensive dataset, we determined the N2 bond dissociation energy to be 78 691.09 ± 0.15 cm-1. This work now places N2 among the few diatomic molecules with bond dissociation energies measured at sub-wavenumber precision.
Collapse
Affiliation(s)
- Peng Wang
- State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China
| | - Shiyan Gong
- State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China
| | - Yixuan Li
- State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China
| | - Yuxiang Mo
- State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China
| |
Collapse
|
2
|
Liu QH, Tan Y, Cheng CF, Hu SM. Precision spectroscopy of molecular hydrogen. Phys Chem Chem Phys 2023; 25:27914-27925. [PMID: 37843424 DOI: 10.1039/d3cp03042c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2023]
Abstract
Precision measurements on the hydrogen molecule are of fundamental importance in understanding molecular theory. Comparison of accurate experimental data and theoretical results are used to test the quantum electrodynamics theory and determine physical constants used in the calculation. We review recent advances and perspectives in the precision spectroscopy of molecular hydrogen, representing state-of-the-art molecular spectroscopy methods and cutting-edge high-precision calculations.
Collapse
Affiliation(s)
- Qian-Hao Liu
- Department of Chemical Physics, University of Science and Technology of China, Hefei, 230026, China.
| | - Yan Tan
- Department of Chemical Physics, University of Science and Technology of China, Hefei, 230026, China.
| | - Cun-Feng Cheng
- Department of Chemical Physics, University of Science and Technology of China, Hefei, 230026, China.
| | - Shui-Ming Hu
- Department of Chemical Physics, University of Science and Technology of China, Hefei, 230026, China.
| |
Collapse
|
3
|
Accurate Adiabatic and Diabatic Potential Energy Surfaces for the Reaction of He + H 2. BIOMED RESEARCH INTERNATIONAL 2022; 2022:7552881. [PMID: 35757471 PMCID: PMC9225863 DOI: 10.1155/2022/7552881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/10/2022] [Accepted: 05/12/2022] [Indexed: 11/17/2022]
Abstract
The accurate adiabatic and diabatic potential energy surfaces, which are for the two lowest states of He + H2, are presented in this study. The Molpro 2012 software package is used, and the large basis sets (aug-cc-pV5Z) are selected. The high-level MCSCF/MRCI method is employed to calculate the adiabatic potential energy points of the title reaction system. The triatomic reaction system is described by Jacobi coordinates, and the adiabatic potential energy surfaces are fitted accurately using the B-spline method. The equilibrium structures and electronic energies for the H2 are provided, and the corresponding different levels of vibrational energies of the ground state are deduced. To better express the diabatic process of the whole reaction, avoid crossing points being calculated and conical intersection also being optimized. Meanwhile, the diabatic potential energy surfaces of the reaction process are constructed. This study will be helpful for the analysis of histopathology and for the study in biological and medical mechanisms.
Collapse
|
4
|
|
5
|
Wang J, Mo Y. Predissociation dynamics of D2 + hv → D(1s1/2) + D(2p1/2,3/2, 2s1/2) revealed by the spin-orbit state resolved fragment branching ratios and angular distributions. J Chem Phys 2019; 150:144306. [DOI: 10.1063/1.5087865] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Jie Wang
- Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China
| | - Yuxiang Mo
- Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China
| |
Collapse
|
6
|
Hölsch N, Beyer M, Salumbides EJ, Eikema KSE, Ubachs W, Jungen C, Merkt F. Benchmarking Theory with an Improved Measurement of the Ionization and Dissociation Energies of H_{2}. PHYSICAL REVIEW LETTERS 2019; 122:103002. [PMID: 30932670 DOI: 10.1103/physrevlett.122.103002] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 01/29/2019] [Indexed: 06/09/2023]
Abstract
The dissociation energy of H_{2} represents a benchmark quantity to test the accuracy of first-principles calculations. We present a new measurement of the energy interval between the EF ^{1}Σ_{g}^{+}(v=0,N=1) state and the 54p1_{1} Rydberg state of H_{2}. When combined with previously determined intervals, this new measurement leads to an improved value of the dissociation energy D_{0}^{N=1} of ortho-H_{2} that has, for the first time, reached a level of uncertainty that is 3 times smaller than the contribution of about 1 MHz resulting from the finite size of the proton. The new result of 35 999.582 834(11) cm^{-1} is in remarkable agreement with the theoretical result of 35 999.582 820(26) cm^{-1} obtained in calculations including high-order relativistic and quantum-electrodynamics corrections, as reported in the following Letter [M. Puchalski, J. Komasa, P. Czachorowski, and K. Pachucki, Phys. Rev. Lett. 122, 103003 (2019)PRLTAO0031-900710.1103/PhysRevLett.122.103003]. This agreement resolves a recent discrepancy between experiment and theory that had hindered a possible use of the dissociation energy of H_{2} in the context of the current controversy on the charge radius of the proton.
Collapse
Affiliation(s)
- Nicolas Hölsch
- Laboratorium für Physikalische Chemie, ETH-Zürich, 8093 Zürich, Switzerland
| | - Maximilian Beyer
- Laboratorium für Physikalische Chemie, ETH-Zürich, 8093 Zürich, Switzerland
| | - Edcel J Salumbides
- LaserLaB, Department of Physics and Astronomy, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Kjeld S E Eikema
- LaserLaB, Department of Physics and Astronomy, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Wim Ubachs
- LaserLaB, Department of Physics and Astronomy, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Christian Jungen
- Department of Physics and Astronomy, University College London, London, WC1E 6BT United Kingdom
| | - Frédéric Merkt
- Laboratorium für Physikalische Chemie, ETH-Zürich, 8093 Zürich, Switzerland
- LaserLaB, Department of Physics and Astronomy, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| |
Collapse
|
7
|
Fu L, Wang D, Huang X. Accurate potential energy surfaces for the first two lowest electronic states of the Li (2p) + H2 reaction. RSC Adv 2018; 8:15595-15602. [PMID: 35539505 PMCID: PMC9080088 DOI: 10.1039/c8ra02504e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Accepted: 04/15/2018] [Indexed: 01/17/2023] Open
Abstract
The accuracy of three-dimensional adiabatic and diabatic potential energy surfaces is calculated using ab initio methods and is numerically fitted for the two lowest electronic states 1 and 22A′ of the LiH2 system, which are very important for the Li (2p) + H2 reaction. The finite difference method is performed to generate the mixing angles, which are used to educe the diabatic potential from the adiabatic potential. The accurate conical intersection (CI) is studied in this work with three different basis sets. The energy of the conical intersection is slightly lower (nearly 0.12 eV) than that of the perpendicular intermediate on the first excited state. By analyzing the potential energy surfaces in this work we can suggest that the most possible reaction pathway for the title reaction is Li (2p) + H2 → LiH2 (22A′) (C2v) → CI → LiH2 (12A′) (C2v) → LiH⋯H → LiH (X1∑g+) + H. The conical intersection and (22A′) intermediate may play a vital role in the title reaction. Accurate diabatic potential energy surfaces for the Li (2p) + H2 → LiH (X) + H reaction are produced.![]()
Collapse
Affiliation(s)
- Liwei Fu
- Laboratory of Theoretical and Computational Chemistry
- Institute of Theoretical Chemistry
- Jilin University
- Changchun
- People’s Republic of China
| | - Dequan Wang
- Laboratory of Theoretical and Computational Chemistry
- Institute of Theoretical Chemistry
- Jilin University
- Changchun
- People’s Republic of China
| | - Xuri Huang
- Laboratory of Theoretical and Computational Chemistry
- Institute of Theoretical Chemistry
- Jilin University
- Changchun
- People’s Republic of China
| |
Collapse
|
8
|
Wang J, Meng Q, Mo Y. Oscillation of Branching Ratios Between the D(2s)+D(1s) and the D(2p)+D(1s) Channels in Direct Photodissociation of D_{2}. PHYSICAL REVIEW LETTERS 2017; 119:053002. [PMID: 28949706 DOI: 10.1103/physrevlett.119.053002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Indexed: 06/07/2023]
Abstract
The direct photodissociation of D_{2} at excitation energies above 14.76 eV occurs via two channels, D(2s)+D(1s) and D(2p)+D(1s). The branching ratios between the two have been measured from the dissociation threshold to 3200 cm^{-1} above it, and it is found that they show cosine oscillations as a function of the fragment wave vector magnitudes. The oscillation is due to an interference effect and can be simulated using the phase difference between the wave functions of the two channels, analogous to Young's double-slit experiment. By fitting the measured branching ratios, we have determined the depths and widths of the effective spherical potential wells related to the two channels, which are in agreement with the effective depths and widths of the ab initio interaction potentials. The results of this Letter illustrate the importance of the relative phase between the fragments in controlling the branching ratios of the photodissociation channels.
Collapse
Affiliation(s)
- Jie Wang
- Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China
| | - Qingnan Meng
- Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China
| | - Yuxiang Mo
- Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China
| |
Collapse
|
9
|
Burgess DR. An Evaluation of Gas Phase Enthalpies of Formation for Hydrogen-Oxygen (H xO y) Species. JOURNAL OF RESEARCH OF THE NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY 2016; 121:108-138. [PMID: 34434616 PMCID: PMC7339710 DOI: 10.6028/jres.121.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 03/11/2016] [Indexed: 06/13/2023]
Abstract
We have compiled gas phase enthalpies of formation for nine hydrogen-oxygen species (HxOy) and selected recommended values for H, O, OH, H2O, HO2, H2O2, O3, HO3, and H2O3. The compilation consists of values derived from experimental measurements, quantum chemical calculations, and prior evaluations. This work updates the recommended values in the NIST-JANAF (1985) and Gurvich et al. (1989) thermochemical tables for seven species. For two species, HO3 and H2O3 (important in atmospheric chemistry) and not found in prior thermochemical evaluations, we also provide supplementary data consisting of molecular geometries, vibrational frequencies, and torsional potentials which can be used to compute thermochemical functions. For all species, we also provide supplementary data consisting of zero point energies, vibrational frequencies, and ion reaction energetics.
Collapse
Affiliation(s)
- Donald R Burgess
- National Institute of Standards and Technology, Gaithersburg, MD 20899
| |
Collapse
|
10
|
Komasa J, Piszczatowski K, Łach G, Przybytek M, Jeziorski B, Pachucki K. Quantum Electrodynamics Effects in Rovibrational Spectra of Molecular Hydrogen. J Chem Theory Comput 2011; 7:3105-15. [DOI: 10.1021/ct200438t] [Citation(s) in RCA: 153] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jacek Komasa
- Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland
| | | | - Grzegorz Łach
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland
| | - Michał Przybytek
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland
| | - Bogumił Jeziorski
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland
| | - Krzysztof Pachucki
- Faculty of Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland
| |
Collapse
|
11
|
Sprecher D, Jungen C, Ubachs W, Merkt F. Towards measuring the ionisation and dissociation energies of molecular hydrogen with sub-MHz accuracy. Faraday Discuss 2011; 150:51-70; discussion 113-60. [DOI: 10.1039/c0fd00035c] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
12
|
|
13
|
Sprecher D, Liu J, Jungen C, Ubachs W, Merkt F. Communication: The ionization and dissociation energies of HD. J Chem Phys 2010; 133:111102. [DOI: 10.1063/1.3483462] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
|
14
|
|
15
|
Piszczatowski K, Łach G, Przybytek M, Komasa J, Pachucki K, Jeziorski B. Theoretical Determination of the Dissociation Energy of Molecular Hydrogen. J Chem Theory Comput 2009; 5:3039-48. [DOI: 10.1021/ct900391p] [Citation(s) in RCA: 149] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Konrad Piszczatowski
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093, Warsaw, Poland, Center for Theoretical and Computational Chemistry, University of Oslo, P.O. Box 1033 Blindern, N-0315 Oslo, Norway, Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland, and Institute of Theoretical Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland
| | - Grzegorz Łach
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093, Warsaw, Poland, Center for Theoretical and Computational Chemistry, University of Oslo, P.O. Box 1033 Blindern, N-0315 Oslo, Norway, Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland, and Institute of Theoretical Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland
| | - Michal Przybytek
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093, Warsaw, Poland, Center for Theoretical and Computational Chemistry, University of Oslo, P.O. Box 1033 Blindern, N-0315 Oslo, Norway, Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland, and Institute of Theoretical Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland
| | - Jacek Komasa
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093, Warsaw, Poland, Center for Theoretical and Computational Chemistry, University of Oslo, P.O. Box 1033 Blindern, N-0315 Oslo, Norway, Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland, and Institute of Theoretical Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland
| | - Krzysztof Pachucki
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093, Warsaw, Poland, Center for Theoretical and Computational Chemistry, University of Oslo, P.O. Box 1033 Blindern, N-0315 Oslo, Norway, Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland, and Institute of Theoretical Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland
| | - Bogumil Jeziorski
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093, Warsaw, Poland, Center for Theoretical and Computational Chemistry, University of Oslo, P.O. Box 1033 Blindern, N-0315 Oslo, Norway, Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland, and Institute of Theoretical Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland
| |
Collapse
|
16
|
|
17
|
Ruscic B, Pinzon RE, Morton ML, von Laszevski G, Bittner SJ, Nijsure SG, Amin KA, Minkoff M, Wagner AF. Introduction to Active Thermochemical Tables: Several “Key” Enthalpies of Formation Revisited. J Phys Chem A 2004. [DOI: 10.1021/jp047912y] [Citation(s) in RCA: 503] [Impact Index Per Article: 25.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Branko Ruscic
- Chemistry Division and Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, Illinois 60439
| | - Reinhardt E. Pinzon
- Chemistry Division and Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, Illinois 60439
| | - Melita L. Morton
- Chemistry Division and Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, Illinois 60439
| | - Gregor von Laszevski
- Chemistry Division and Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, Illinois 60439
| | - Sandra J. Bittner
- Chemistry Division and Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, Illinois 60439
| | - Sandeep G. Nijsure
- Chemistry Division and Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, Illinois 60439
| | - Kaizar A. Amin
- Chemistry Division and Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, Illinois 60439
| | - Michael Minkoff
- Chemistry Division and Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, Illinois 60439
| | - Albert F. Wagner
- Chemistry Division and Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, Illinois 60439
| |
Collapse
|
18
|
Zhang YP, Cheng CH, Kim JT, Stanojevic J, Eyler EE. Dissociation energies of molecular hydrogen and the hydrogen molecular ion. PHYSICAL REVIEW LETTERS 2004; 92:203003. [PMID: 15169348 DOI: 10.1103/physrevlett.92.203003] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2003] [Indexed: 05/24/2023]
Abstract
We have obtained improved values for the dissociation energies of molecular hydrogen and its ion by using a high-resolution pulse-amplified laser to probe the second dissociation limit. The onset of the vibrational continuum is observed by state-selective detection of the atomic products of dissociation, and several auxiliary measurements link the results to the ground state. The dissociation energies are accurate to 0.010-0.026 cm(-1), improving previous measurements by a factor of 3-7. Agreement with ab initio calculations is good for H2, D2, and their ions, but not for HD and HD+.
Collapse
Affiliation(s)
- Y P Zhang
- Physics Department, University of Connecticut, Storrs, Connecticut 06269, USA
| | | | | | | | | |
Collapse
|
19
|
Kim KH, Lee YS, Ishida T, Jeung GH. Dynamics calculations for the LiH+H⇆Li+H2 reactions using interpolations of accurate ab initio potential energy surfaces. J Chem Phys 2003. [DOI: 10.1063/1.1596391] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
|
20
|
Pielage T, de Lange A, Brandi F, Ubachs W. Bound energy levels at the n=2 dissociation threshold in HD. Chem Phys Lett 2002. [DOI: 10.1016/s0009-2614(02)01617-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
21
|
Szybisz L, Urrutia I. Simple model of capillary condensation in cylindrical pores. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2002; 66:051201. [PMID: 12513473 DOI: 10.1103/physreve.66.051201] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2002] [Revised: 06/25/2002] [Indexed: 05/24/2023]
Abstract
A simple model based on an approximation of the dropletlike model is formulated for studying adsorption of fluids into cylindrical pores. This model yields a nearly universal description of capillary condensation transitions for noble gases confined by alkali metals. The system's thermodynamical behavior is predicted from the values of two dimensionless parameters: D* (the reduced asymptotic strength of the fluid-adsorber interaction, a function of temperature) and R* (the reduced radius of the pore). The phenomenon of hysteresis inherently related to capillary condensation is discussed. The connection to a previously proposed universality for cylindrical pores is also established.
Collapse
Affiliation(s)
- Leszek Szybisz
- Laboratorio TANDAR, Departamento de Física, Comisión Nacional de Energía Atómica, Avenida del Libertador 8250, RA-1429 Buenos Aires, Argentina
| | | |
Collapse
|
22
|
Gatica SM, Calbi MM, Cole MW. Simple model of capillary condensation in porous media. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2002; 65:061605. [PMID: 12188741 DOI: 10.1103/physreve.65.061605] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2002] [Indexed: 05/23/2023]
Abstract
We employ a simple model to describe the phase behavior of 4He and Ar in a hypothetical porous material consisting of a regular array of infinitely long, solid, parallel cylinders. We find that high porosity geometries exhibit two transitions: from vapor to film and from film to capillary condensed liquid. At low porosity, the film is replaced by a "necking" configuration, and for a range of intermediate porosity there are three transitions: from vapor to film, from film to necking and from necking to a capillary condensed phase.
Collapse
Affiliation(s)
- S M Gatica
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
| | | | | |
Collapse
|
23
|
Braun OM, Röder J. Transition from stick-slip to smooth sliding: an earthquakelike model. PHYSICAL REVIEW LETTERS 2002; 88:096102. [PMID: 11864031 DOI: 10.1103/physrevlett.88.096102] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2001] [Indexed: 05/23/2023]
Abstract
We present a detailed study of an earthquakelike model that exhibits a "transition" from stick-slip motion to smooth sliding at a velocity of the order of those observed in experiments. This contrasts with the many previous microscopic models in which the transition velocity is many orders of magnitude too large. The results show that experimentally observed smooth sliding at the macroscopic scale must correspond to microscopic-scale stick-slip motion.
Collapse
Affiliation(s)
- O M Braun
- Institute of Physics, National Ukrainian Academy of Sciences, 03650 Kiev, Ukraine
| | | |
Collapse
|
24
|
Esztermann A, Heni M, Löwen H, Klier J, Sohaili M, Leiderer P. Triple-point wetting on rough substrates. PHYSICAL REVIEW LETTERS 2002; 88:055702. [PMID: 11863749 DOI: 10.1103/physrevlett.88.055702] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2001] [Indexed: 05/23/2023]
Abstract
The influence of substrate roughness on the wetting scenario of adsorbed van der Waals films is investigated by theory and experiment. Calculating the bending free energy penalty of a solid sheet picking up the substrate roughness, we show that a finite roughness always leads to triple-point wetting reducing the widths of the adsorbed solid films considerably as compared to that of smooth substrates. Testing the theory against our experimental data for molecular hydrogen adsorbed on gold, we find quantitative agreement.
Collapse
Affiliation(s)
- A Esztermann
- Institut für Theoretische Physik II, Heinrich-Heine-Universität Düsseldorf, Universitätsstrasse 1, 40225 Düsseldorf, Germany
| | | | | | | | | | | |
Collapse
|
25
|
Kim KH, Lee HS, Lee YS, Jeung GH. Potential energy surfaces for the photochemical reactions Ca*+H2→CaH+H. J Chem Phys 2002. [DOI: 10.1063/1.1425407] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
|
26
|
Bodo E, Gianturco FA, Martinazzo R, Raimondi M. Reactive Behavior of the [LiH2]+ System I. Evaluation of the Lower-lying Electronic Potentials for the Collinear Geometries. J Phys Chem A 2001. [DOI: 10.1021/jp0123435] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- E. Bodo
- University of Rome “La Sapienza”, Department of Chemistry, P.le A. Moro 5, 00185, Roma, and University of Milan, Department of Physical Chemistry and Electrochemistry and CNR center CSR SRC, V. Golgi 19, 20133, Milan
| | - F. A. Gianturco
- University of Rome “La Sapienza”, Department of Chemistry, P.le A. Moro 5, 00185, Roma, and University of Milan, Department of Physical Chemistry and Electrochemistry and CNR center CSR SRC, V. Golgi 19, 20133, Milan
| | - R. Martinazzo
- University of Rome “La Sapienza”, Department of Chemistry, P.le A. Moro 5, 00185, Roma, and University of Milan, Department of Physical Chemistry and Electrochemistry and CNR center CSR SRC, V. Golgi 19, 20133, Milan
| | - M. Raimondi
- University of Rome “La Sapienza”, Department of Chemistry, P.le A. Moro 5, 00185, Roma, and University of Milan, Department of Physical Chemistry and Electrochemistry and CNR center CSR SRC, V. Golgi 19, 20133, Milan
| |
Collapse
|
27
|
Braun OM, Peyrard M. Friction in a solid lubricant film. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2001; 63:046110. [PMID: 11308915 DOI: 10.1103/physreve.63.046110] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2000] [Indexed: 05/15/2023]
Abstract
Molecular-dynamics study of a thin (one to five layers) lubricant film between two substrates in moving contact are performed using Langevin equations with an external damping coefficient depending on distance and velocity of atoms relative the substrates, motivated by microscopic configurations. They show that the minimal friction coefficient is obtained for the solid-sliding regime. A detailed analysis of the results, the comparison with other microscopic modeling approaches of friction, and the evaluation of quantities that can be compared to experiments, such as the velocity of the transition from stick slip to smooth sliding, are used to discuss the relevance of the microscopic simulations of friction.
Collapse
Affiliation(s)
- O M Braun
- Institute of Physics, National Ukrainian Academy of Sciences, 03650 Kiev, Ukraine.
| | | |
Collapse
|
28
|
Braun OM, Paliy MV, Röder J, Bishop AR. Locked-to-running transition in the two-dimensional underdamped driven Frenkel-Kontorova model. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2001; 63:036129. [PMID: 11308731 DOI: 10.1103/physreve.63.036129] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2000] [Indexed: 05/23/2023]
Abstract
We study the nonlinear dc response of a two-dimensional underdamped system of interacting atoms subject to an isotropic periodic external potential with triangular symmetry. We consider various values of the effective elastic constant of the system, two different atomic interaction potentials, and different concentrations of atoms. In the case of a closely packed layer, when its structure is commensurate with the substrate, there is a locked-to-running transition as a function of the driving force, whose mechanism depends on the effective elastic constant. For a low elastic constant, where the layer is weakly coupled, the transition is achieved via the creation of an avalanche of moving particles that leaves a depleted region in its wake. On increasing the effective elastic constant the depleted region becomes less marked and there is a crossover to a scenario in which an island of moving particles nucleates the transition. In the case of a partially filled atomic layer, several dynamical phase transitions between states with different atomic mobility are observed. The mobility of atoms as a function of the external force can vary nonmonotonically with increasing force. For the case of a small external damping, the system can be trapped at a large force in an immobile metastable state, thus demonstrating a "fuse-safety device" on an atomic scale.
Collapse
Affiliation(s)
- O M Braun
- Institute of Physics, National Ukrainian Academy of Sciences, UA-252022 Kiev, Ukraine.
| | | | | | | |
Collapse
|
29
|
Granato E, Ying SC. Transverse thermal depinning and nonlinear sliding friction of an adsorbed monolayer. PHYSICAL REVIEW LETTERS 2000; 85:5368-5371. [PMID: 11135998 DOI: 10.1103/physrevlett.85.5368] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2000] [Indexed: 05/23/2023]
Abstract
We study the response of an adsorbed monolayer under a driving force as a model of sliding friction phenomena between two crystalline surfaces with a boundary lubrication layer. Using Langevin-dynamics simulation, we determine the nonlinear response in the direction transverse to a high symmetry direction along which the layer is already sliding. We find that below a finite transition temperature there exist a critical depinning force and hysteresis effects in the transverse response in the dynamical state when the adlayer is sliding smoothly along the longitudinal direction.
Collapse
Affiliation(s)
- E Granato
- Laboratório Associado de Sensores e Materiais, Instituto Nacional de Pesquisas Espaciais, 12201-190 São José dos Campos, São Paulo, Brazil
| | | |
Collapse
|
30
|
Braun OM, Hu B, Zeltser A. Driven kink in the frenkel-kontorova model. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 2000; 62:4235-4245. [PMID: 11088952 DOI: 10.1103/physreve.62.4235] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/1999] [Indexed: 05/23/2023]
Abstract
The dynamics of dc driven chain of harmonically interacting atoms in the external sinusoidal potential (the Frenkel-Kontorova model) is studied. It is shown that in the underdamped case the motion of the topological soliton (kink) becomes unstable at a high velocity due to excitation of the localized intrinsic kink mode (the discrete shape mode, or discrete breather) in the kink tail. When the amplitude of the breather's oscillation becomes large enough, it decays into a kink-antikink pair. The subsequent collision of newly created kink and antikink leads to a sharp transition to the running state, where all atoms of the chain slide over the external potential almost freely.
Collapse
Affiliation(s)
- OM Braun
- Institute of Physics, National Ukrainian Academy of Sciences, 03650 Kiev, Ukraine and Department of Physics and CNS, Hong Kong Baptist University, Hong Kong, China
| | | | | |
Collapse
|
31
|
Dudiy SV, Hartford J, Lundqvist BI. Nature of metal-ceramic adhesion: computational experiments with Co on TiC. PHYSICAL REVIEW LETTERS 2000; 85:1898-1901. [PMID: 10970642 DOI: 10.1103/physrevlett.85.1898] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2000] [Indexed: 05/23/2023]
Abstract
By means of first-principles computational experiments, the microscopic mechanism of metal-carbide adhesion is revealed. Density-functional-theory results for the Co /TiC(001) interface show the interface bonding to be dominated by Co-C bonds. The effective number of bonds is controlled by an interplay between lattice mismatch and relaxation effects. The particular strength of the Co-C bond is explained in terms of interface-induced features of the electronic states, in particular, a novel metal-modified covalent bond. The calculated adhesion strength agrees well with results of wetting experiments.
Collapse
Affiliation(s)
- SV Dudiy
- Department of Applied Physics, Chalmers University of Technology and Goteborg University, SE-412 96 Goteborg, Sweden
| | | | | |
Collapse
|
32
|
Wang Y, Chen D, Zhang X. Calculated equation of state of al, cu, ta, mo, and W to 1000 GPa. PHYSICAL REVIEW LETTERS 2000; 84:3220-3223. [PMID: 11019055 DOI: 10.1103/physrevlett.84.3220] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/1999] [Indexed: 05/23/2023]
Abstract
Calculated Hugoniots and 293-K isotherms at pressures up to 1 TPa (10 Mbar) for the five reference metals Al, Cu, Ta, Mo, and W are reported using the classical mean-field approach where both the cold and the thermal parts of the Helmholtz free energy are derived entirely from the 0-K total energies and electronic density of states calculated with the full-potential linearized augmented plane wave method within the generalized gradient approximation to exchange correlational functional. Our approach permits efficient computation and invokes no empirical parameters. Both the experimental Hugoniots and 293-K isotherms are reproduced excellently.
Collapse
Affiliation(s)
- Y Wang
- Institute of Applied Physics and Computational Mathematics, P.O. Box 8009, 100088, Beijing, People's Republic of China
| | | | | |
Collapse
|
33
|
Tovstopyat-Nelip I, Hentschel HG. Friction and noise-induced coherent structures in boundary lubrication. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 2000; 61:3318-24. [PMID: 11088104 DOI: 10.1103/physreve.61.3318] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/1999] [Indexed: 11/07/2022]
Abstract
We examine the effect of stick-slip boundary conditions on the friction generated by a molecularly thin layer of a liquid lubricant separating two plates. For one-dimensional compressible flows, noise-induced coherent dissipative structures on a micron scale are generated due to cooperation between the external drive and the thermal noise. As a function of the thermal noise these structures show a peak in their amplitudes similar to stochastic resonance. At low velocities a reduction in friction with increasing thermal noise is observed.
Collapse
|
34
|
Curtarolo S, Stan G, Bojan MJ, Cole MW, Steele WA. Threshold criterion for wetting at the triple point. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 2000; 61:1670-1675. [PMID: 11046451 DOI: 10.1103/physreve.61.1670] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/1999] [Indexed: 05/23/2023]
Abstract
Grand canonical simulations are used to calculate adsorption isotherms of various classical gases on alkali metal and Mg surfaces. Ab initio adsorption potentials and Lennard-Jones gas-gas interactions are used. Depending on the system, the resulting behavior can be nonwetting for all temperatures studied, complete wetting, or (in the intermediate case) exhibit a wetting transition. An unusual variety of wetting transitions at the triple point is found in the case of a specific adsorption potential of intermediate strength. The general threshold for wetting near the triple point is found to be close to that predicted with a heuristic model of Cheng et al. This same conclusion was drawn in a recent experimental and simulation study of Ar on CO2 by Mistura et al. These results imply that a dimensionless wetting parameter w is useful for predicting whether wetting behavior is present at and above the triple temperature. The nonwetting/wetting crossover value found here is w approximately 3.3.
Collapse
Affiliation(s)
- S Curtarolo
- Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | | | | | | | | |
Collapse
|
35
|
Lee HS, Lee YS, Jeung GH. Potential Energy Surfaces for LiH2and Photochemical Reactions Li*+ H2↔ LiH + H. J Phys Chem A 1999. [DOI: 10.1021/jp9921295] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
36
|
Reinhold E, de Lange A, Hogervorst W, Ubachs W. Observation of the I′ 1Πg outer well state in H2 and D2. J Chem Phys 1998. [DOI: 10.1063/1.477647] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
37
|
Perdew JP, Burke K, Ernzerhof M. Generalized Gradient Approximation Made Simple. PHYSICAL REVIEW LETTERS 1996; 77:3865-3868. [PMID: 10062328 DOI: 10.1103/physrevlett.77.3865] [Citation(s) in RCA: 65299] [Impact Index Per Article: 2332.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/14/2023]
|
38
|
Körling M, Ergon J. Gradient-corrected ab initio calculations of spin-spiral states in fcc-Fe and the effects of the atomic-spheres approximation. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:R8293-R8296. [PMID: 9984578 DOI: 10.1103/physrevb.54.r8293] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
39
|
Jones KM, Maleki S, Bize S, Lett PD, Williams CJ, Richling H, Knöckel H, Tiemann E, Wang H, Gould PL, Stwalley WC. Direct measurement of the ground-state dissociation energy of Na2. PHYSICAL REVIEW A 1996; 54:R1006-R1009. [PMID: 9913658 DOI: 10.1103/physreva.54.r1006] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
40
|
Núñez-Regueiro MD, Lacroix C, Canals B. RCuO2.66 delafossites: A dilute s=1/2 kagomé-like lattice. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:R736-R739. [PMID: 9985422 DOI: 10.1103/physrevb.54.r736] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
41
|
Moroni EG, Grimvall G, Jarlborg T. Free energy contributions to the hcp-bcc transformation in transition metals. PHYSICAL REVIEW LETTERS 1996; 76:2758-2761. [PMID: 10060781 DOI: 10.1103/physrevlett.76.2758] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
42
|
Braiman Y, Family F, Hentschel HG. Array-enhanced friction in the periodic stick-slip motion of nonlinear oscillators. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1996; 53:R3005-R3008. [PMID: 9964752 DOI: 10.1103/physreve.53.r3005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
43
|
Carlson JM, Batista AA. Constitutive relation for the friction between lubricated surfaces. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1996; 53:4153-4165. [PMID: 9964729 DOI: 10.1103/physreve.53.4153] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
44
|
Leitenstorfer A, Fürst C, Laubereau A, Kaiser W, Tränkle G, Weimann G. Femtosecond carrier dynamics in GaAs far from equilibrium. PHYSICAL REVIEW LETTERS 1996; 76:1545-1548. [PMID: 10061750 DOI: 10.1103/physrevlett.76.1545] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
45
|
Hoffman A, Paterson PJ, Johnston ST, Prawer S. Ion-beam-induced modification of fullerene films as studied by electron-energy-loss spectroscopy. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:1573-1578. [PMID: 9983620 DOI: 10.1103/physrevb.53.1573] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
46
|
Shenoy VB, Saam WF. Continuous wetting transitions in Xe adsorbed on NaF and on plated Cs and Rb substrates. PHYSICAL REVIEW LETTERS 1995; 75:4086-4089. [PMID: 10059811 DOI: 10.1103/physrevlett.75.4086] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
47
|
Wyatt AF, Klier J, Stefanyi P. Prewetting of 4He on Rb: The coexistence of two superfluid films? PHYSICAL REVIEW LETTERS 1995; 74:1151-1154. [PMID: 10058947 DOI: 10.1103/physrevlett.74.1151] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
48
|
Ahuja R, Auluck S, Wills JM, Eriksson O, Söderlind P, Johansson B. Fermi surface of alkali metals using the full-potential linear muffin-tin orbital method and the generalized gradient approximation. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:18003-18006. [PMID: 9976229 DOI: 10.1103/physrevb.50.18003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
49
|
Persson BN, Tosatti E. Layering transition in confined molecular thin films: Nucleation and growth. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:5590-5599. [PMID: 9976903 DOI: 10.1103/physrevb.50.5590] [Citation(s) in RCA: 68] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
50
|
Balakrishnan A, Smith V, Stoicheff BP. Dissociation energies of the hydrogen and deuterium molecules. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1994; 49:2460-2469. [PMID: 9910520 DOI: 10.1103/physreva.49.2460] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|