Release Time:2019-03-11  Hits:

Indexed by: Journal Article

Date of Publication: 2017-01-01

Journal: MOLECULAR PHYSICS

Included Journals: Scopus、EI、SCIE

Volume: 115

Issue: 19

Page Number: 2442-2450

ISSN: 0026-8976

Key Words: Molecular data; rotational quenching; cross section; rate coefficient

Abstract: Quantum close-coupling computations of the rotational quenching of H-2 and its isotopologues due to He impact a re performed using a highly accurate potential energy surface. State-to-state cross sections are obtained in a wide range of collision energies between 10(-5)cm(-1 )and 10(-4)cm(-1), and the th eoretical rate coefficients are reported for temperatures ranging from 10(-4) K to 3000 K. Compared with previous studies, the well depth of the potential adopted in this study is larger, leading to stronger resonance effects in the cross sections of He-HD. The accurate potential was employed to investigate the isotope effects of H-2 in detail. The cross-section resonances shift towards lower collision energies and become stronger with increasing reduced mass. The calculated cross sections and rate coefficients of H-2 and its isotopic variants in collisions with He are provided to study the energy transfer in these systems.