Open AccessRotational relaxation and excitation rates of hydrogen fluoride in collision with ortho‐ and para‐H 2
Author(s) -
Guillon G.,
Stoecklin T.
Publication year - 2012
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2011.20065.x
Subject(s) - excitation , physics , atomic physics , hydrogen fluoride , collision , collisional excitation , hydrogen , scattering , relaxation (psychology) , range (aeronautics) , quenching (fluorescence) , chemistry , fluorescence , materials science , ionization , ion , quantum mechanics , computer security , inorganic chemistry , social psychology , psychology , computer science , composite material
We report de‐excitation (and excitation) rate coefficients based on previous time‐independent close‐coupling scattering calculations for the rotational transitions of the hydrogen fluoride (HF) induced by collision with the two nuclear spin isomers ortho‐ and para‐H 2 . These calculations were realized with the use of a new global four‐dimensional potential energy surface recently computed by our group. We consider transitions for HF rotational levels up to j HF = 7, and for H 2 levels up to = 3 (ortho‐H 2 ) and = 2 (para‐H 2 ). Rates are calculated for a range of temperatures up to 150 K. Our results show a strong difference of behaviour between ortho‐H 2 and para‐H 2 and validate the much stronger efficiency for the quenching of HF in collision with H 2 in comparison with He.