Title

Full-Dimensional Quantum Rovibrational Scattering of SO with H2

Document Type

Conference Proceeding

Publication Date

5-29-2019

Publication Title

Bulletin of the American Physical Society

Publisher

American Physical Society

Volume

64

Issue

4

First page number:

1

Last page number:

1

Abstract

Molecular collisional rate coefficients are required to predict the abundance of molecular gas in the interstellar medium. SO has been widely observed in a variety interstellar regions and its collisional rate coefficients with the dominant collision partner H2 are of astrophysical importance. We present a quantum close-coupling study of rovibrationally inelastic scattering of SO with H2. A six-dimensional (6D) potential energy surface (PES) was constructed with high-level ab initio calculations and an invariant polynomial fitting. The scattering calculations were carried out for both rotational and rovibrational transitions of SO induced by H2. Cross sections for rotational transitions from j1=0-10 of SO in the ground vibrational state were computed for collision energies ranging from 1 to 3000 cm−1. The rotational rate coefficients are compared with previous theoretical results obtained within a rigid-rotor approximation. For rovibrational transitions, state-to-state quenching cross sections and rate coefficients were calculated for the vibrational quenching of SO from (v1=1,j1), j1=0-5. Cross sections for collision energies in the range 1 to 3000 cm−1 and rate coefficients ranging from 5 to 600 K are presented.

Disciplines

Atomic, Molecular and Optical Physics | Physical Sciences and Mathematics | Physics

Language

English


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