Document Detail

Argon-Induced Pressure Broadening, Shifting and Narrowing in the CN A (2)Π - X (2)Σ(+) (1-0) Band.
MedLine Citation:
PMID:  23725543     Owner:  NLM     Status:  Publisher    
Selected isolated rotational transitions in the 1-0 band of the red A 2Π - X 2Σ+ system in CN have been recorded with transient frequency modulation spectroscopy as a function of argon pressure up to 0.2 atmospheres at room temperature. Line shapes were fit using Fourier transforms of a parameterized time correlation function, including Doppler and velocity-dependent collisional broadening, and collisional shifts. Deviations from Voigt line shapes can be equally well fit by modeling the narrowing with a speed-dependent collision model or with a velocity-changing collisional narrowing model. Pressure broadening coefficients were observed with little rotational state dependence, in the range of 0.070 - 0.075 cm-1 atm-1. In contrast, stronger and qualitatively different rotational state dependences are observed for both pressure-dependent blue shift coefficients and the narrowing parameters. No asymmetry in the pressure broadened lines was observed.
Damien Forthomme; Chris P McRaven; Trevor J Sears; Gregory E Hall
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-5-31
Journal Detail:
Title:  The journal of physical chemistry. A     Volume:  -     ISSN:  1520-5215     ISO Abbreviation:  J Phys Chem A     Publication Date:  2013 May 
Date Detail:
Created Date:  2013-6-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9890903     Medline TA:  J Phys Chem A     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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