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International Journal of Spectroscopy
Volume 2010 (2010), Article ID 705896, 5 pages
http://dx.doi.org/10.1155/2010/705896
Research Article

Far Wing Asymmetry of Rotational Raman Lines in Hydrogen

Department of Chemistry, University of Gothenburg, SE 412 96 Gothenburg, Sweden

Received 22 April 2009; Accepted 8 July 2009

Academic Editor: Chantal Stehle

Copyright © 2010 Magnus Gustafsson. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Depolarized Raman spectra of compressed hydrogen gas have been computed rigorously previously for 36 K and 50 K (Gustafsson et al. (2009)). The far wings of the rotational lines show asymmetry that goes beyond that expected from the theory for intracollisional interference and Fano line shapes. Here we analyze the 𝑆 0 (0) line for pure hydrogen at 36 K in detail. The added asymmetry stems partly from a shape resonance which adds significant intensity to the higher frequency side of the line profile. The influence of the threshold energy for the rotational transition accounts for the remainder.