1
|
Fakhardji W, Szabó P, El-Kader MSA, Haskopoulos A, Maroulis G, Gustafsson M. Collision-induced absorption in Ar-Kr gas mixtures: A molecular dynamics study with new potential and dipole data. J Chem Phys 2019; 151:144303. [PMID: 31615255 DOI: 10.1063/1.5099700] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We have implemented a scheme for classical molecular dynamics simulations of collision-induced absorption. The program has been applied to a gas mixture of argon (Ar) and krypton (Kr). The simulations are compared with accurate quantum dynamical calculations. The comparisons of the absorption coefficients show that classical molecular dynamics is correct within 10% for photon wave numbers up to 220 cm-1 at a temperature of 200 K for this system. At higher temperatures, the agreement is even better. Molecular dynamics accounts for many-body interactions, which, for example, give rise to continuous dimer formation and destruction in the gas. In this way, the method has an advantage compared with bimolecular classical (trajectory) treatments. The calculations are carried out with a new empirical Ar-Kr pair potential. This has been obtained through extensive analysis of experimental thermophysical and transport properties. We also present a new high level ab initio Ar-Kr potential curve for comparison, as well as ab initio interaction-induced dipole curves computed with different methods. In addition, the Ar-Kr polarizability and hyperpolarizability are reported. A comparison of the computed absorption spectra with an experiment taken at 300 K shows satisfactory agreement although a difference in absolute magnitude of 10%-15% persists. This discrepancy we attribute mainly to experimental uncertainty.
Collapse
Affiliation(s)
- Wissam Fakhardji
- Applied Physics, Division of Materials Science, Department of Engineering Science and Mathematics, Luleå University of Technology, 97187 Luleå, Sweden
| | - Péter Szabó
- Applied Physics, Division of Materials Science, Department of Engineering Science and Mathematics, Luleå University of Technology, 97187 Luleå, Sweden
| | - M S A El-Kader
- Department of Engineering Mathematics and Physics, Faculty of Engineering, Cairo University, Giza 12211, Egypt
| | | | - George Maroulis
- Department of Chemistry, University of Patras, Patras GR-26500, Greece
| | - Magnus Gustafsson
- Applied Physics, Division of Materials Science, Department of Engineering Science and Mathematics, Luleå University of Technology, 97187 Luleå, Sweden
| |
Collapse
|
2
|
Brouard M, Chadwick H, Gordon SDS, Hornung B, Nichols B, Aoiz FJ, Stolte S. Rotational Orientation Effects in NO(X) + Ar Inelastic Collisions. J Phys Chem A 2015; 119:12404-16. [PMID: 26413997 DOI: 10.1021/acs.jpca.5b07846] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Rotational angular momentum orientation effects in the rotationally inelastic collisions of NO(X) with Ar have been investigated both experimentally and theoretically at a collision energy of 530 cm(-1). The collision-induced orientation has been determined experimentally using a hexapole electric field to select the ϵ = -1 Λ-doublet level of the NO(X) j = 1/2 initial state. Fully quantum state resolved polarization-dependent differential cross sections were recorded experimentally using a crossed molecular beam apparatus coupled with a (1 + 1') resonance-enhanced multiphoton ionization detection scheme and subsequent velocity-map imaging. To determine the NO sense of rotation, the probe radiation was circularly polarized. Experimental orientation polarization-dependent differential cross sections are compared with those obtained from quantum mechanical scattering calculations and are found to be in good agreement. The origin of the collision-induced orientation has been investigated by means of close-coupled quantum mechanical, quantum mechanical hard shell, quasi-classical trajectory (QCT), and classical hard shell calculations at the same collision energy. Although there is evidence for the operation of limiting classical mechanisms, the rotational orientation cannot be accounted for by QCT calculations and is found to be strongly influenced by quantum mechanical effects.
Collapse
Affiliation(s)
- M Brouard
- The Physical and Theoretical Chemistry Laboratory, The Department of Chemistry, University of Oxford , South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - H Chadwick
- The Physical and Theoretical Chemistry Laboratory, The Department of Chemistry, University of Oxford , South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - S D S Gordon
- The Physical and Theoretical Chemistry Laboratory, The Department of Chemistry, University of Oxford , South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - B Hornung
- The Physical and Theoretical Chemistry Laboratory, The Department of Chemistry, University of Oxford , South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - B Nichols
- The Physical and Theoretical Chemistry Laboratory, The Department of Chemistry, University of Oxford , South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - F J Aoiz
- Departamento de Química Física, Facultad de Química, Universidad Complutense , 28040 Madrid, Spain
| | - S Stolte
- Institute of Atomic and Molecular Physics, Jilin University , Changchun 130012, China.,Department of Physics and Astronomy, LaserLaB, Vrije Universiteit, Amsterdam , De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands.,Laboratoire Francis Perrin, Bâtiment 522, DRECEM/SPAM/CEA Saclay, 91191 Gif sur Yvette, France
| |
Collapse
|
3
|
Long-range intermolecular potentials for the metastable rare gas-rare gas systems Ar*, Kr*(3P0,2)+Ar, Kr, Xe. Chem Phys 1988. [DOI: 10.1016/0301-0104(88)90029-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
5
|
Trengove RD, Dunlop PJ. Thermal diffusion factors for the system Ar–Kr at 300 and 255 K. J Chem Phys 1984. [DOI: 10.1063/1.446442] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
7
|
|
8
|
Gregor RW, Siska PE. Differential elastic scattering of Ne*(3s 3P2,0) by Ar, Kr, and Xe: Optical potentials and their orbital interpretation. J Chem Phys 1981. [DOI: 10.1063/1.441214] [Citation(s) in RCA: 86] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
9
|
van der Kam P, Beijerinck H, Thijssen W, Everdij J, Verster N. Monte Carlo calculation of angular transmission functions for small angle scattering. Chem Phys 1980. [DOI: 10.1016/0301-0104(80)80032-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
10
|
Beijerinck H, van der Kam P, Thijssen W, Verster N. Semiclassical description of the small angle differential cross section for elastic atom—atom scattering. Chem Phys 1980. [DOI: 10.1016/0301-0104(80)85070-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
11
|
|
12
|
Aziz R, Presley J, Buck U, Schleusener J. An accurate intermolecular potential for Ar–Kr. J Chem Phys 1979. [DOI: 10.1063/1.437262] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|