|
1
|
Yang B, Qu C, Bowman JM, Yang D, Guo H, Balakrishnan N, Forrey RC, Stancil PC. Inelastic Triatom-Atom Quantum Close-Coupling Dynamics in Full Dimensionality: All Rovibrational Mode Quenching of Water Due to the H Impact on a Six-Dimensional Potential Energy Surface. J Phys Chem Lett 2024; 15:11312-11319. [PMID: 39496299 PMCID: PMC11571227 DOI: 10.1021/acs.jpclett.4c02865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2024] [Revised: 10/28/2024] [Accepted: 10/31/2024] [Indexed: 11/06/2024]
Abstract
The rovibrational level populations, and subsequent emission in various astrophysical environments, are driven by inelastic collision processes. The available rovibrational rate coefficients for water have been calculated using a number of approximations. We present a numerically exact calculation for the rovibrational quenching for all water vibrational modes due to collisions with atomic hydrogen. The scattering theory implements a quantum close-coupling (CC) method on a high level ab initio six-dimensional (6D) potential energy surface (PES). Total rovibrational quenching cross sections for excited bending levels were compared with earlier results on a 4D PES with the rigid-bender close-coupling (RBCC) approximation. General agreement between 6D-CC and 4D-RBCC calculations are found, but differences are evident including the energy and amplitude of low-energy orbiting resonances. Quenching cross sections from the symmetric and asymmetric stretch modes are provided for the first time. The current 6D-CC calculation provides accurate inelastic data needed for astrophysical modeling.
Collapse
Affiliation(s)
- Benhui Yang
- Department
of Physics and Astronomy and Center for Simulational Physics, University of Georgia, Athens, Georgia 30602, United States
| | - Chen Qu
- Department
of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - J. M. Bowman
- Department
of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Dongzheng Yang
- Department
of Chemistry and Chemical Biology, Center for Computational Chemistry, University of New Mexico, Albuquerque, New Mexico 87131, United States
| | - Hua Guo
- Department
of Chemistry and Chemical Biology, Center for Computational Chemistry, University of New Mexico, Albuquerque, New Mexico 87131, United States
| | - N. Balakrishnan
- Department
of Chemistry and Biochemistry, University
of Nevada, Las Vegas, Nevada 89154, United States
| | - R. C. Forrey
- Department
of Physics, Penn State University, Berks Campus, Reading, Pennsylvania 19610, United States
| | - P. C. Stancil
- Department
of Physics and Astronomy and Center for Simulational Physics, University of Georgia, Athens, Georgia 30602, United States
| |
Collapse
|