Collisional line widths of autoperturbed N2: Measurements and quantum calculations

In this work we present new experimental and theoretical values for the line broadening coefficients of the Q-branch Raman lines of autoperturbed N2. For the experimental determination of the coefficients, high resolution stimulated Raman spectra of the Q-branch of N2 at different pressures were obt...

Full description

Saved in:
Bibliographic Details
Published in:Journal of quantitative spectroscopy & radiative transfer 2011, Vol.112 (16), p.2542-2551
Main Authors: Thibault, Franck, Martínez, Raúl Z., Bermejo, Dionisio, Gómez, Laura
Format: Article
Language:English
Subjects:
Physics
Popular Physics
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In this work we present new experimental and theoretical values for the line broadening coefficients of the Q-branch Raman lines of autoperturbed N2. For the experimental determination of the coefficients, high resolution stimulated Raman spectra of the Q-branch of N2 at different pressures were obtained at 77, 194 and 298 K. Simultaneously, quantum dynamical calculations, performed on two potential energy surfaces, were carried out for the system between 77 and 298 K, rendering a set of theoretical line broadening coefficients that could be directly compared to those obtained from the present measurements and the previous ones. Within the limit of considering the colliding molecules distinguishable we discuss the ortho and para contributions to the pressure broadening cross-sections. Because such calculations are time consuming we indicate routes to circumvent this difficulty. We observe a reasonable agreement between theoretical and experimental values of the collisionalline broadening coefficients at all the studied temperatures.
ISSN:0022-4073
DOI:10.1016/j.jqsrt.2011.07.006