Hydrogen dimer features in low temperature collision-induced spectra

23rd International Conference on Spectral Line Shapes

Gustafsson, M.^1

Applied Physics, Division of Materials Science, Department of Engineering Science and Mathematics, Luleå University of Technology, Luleå

SE-97187, Sweden^1

关键词: Bound-to-bound transition;    Computational approach;    Isotropic approximations;    Laboratory datum;    Low-temperature collisions;    Planetary atmosphere;    Radiative transfer model;    Rotational transition;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/810/1/012017/pdf
DOI  :  10.1088/1742-6596/810/1/012017

来源: IOP

【 摘 要 】

The absorption of radiation in pure hydrogen (H2) gas around the S(0) and S(1) rotational transitions is computed at 20 K and compared with laboratory data. All transitions involving free state are included in the calculations of the absolute absorption. These calculations are done with an isotropic approximation for the H2-H2pair potential. Agreement with the experiment is observed around the S(0) transition, while the computational approach appears to be slightly worse around the S(1) transition. The positions for bound-to-bound transitions are computed including the full anisotropic pair potential. The anisotropy seems to be crucial to achieve agreement with the measured bound-to-bound transition frequencies. However, those transitions contribute little to the total absorption. The present computed absolute absorptions will provide improved input for radiative transfer models of planetary atmospheres.