Open AccessDirect measurements of collisional Raman line broadening in the S-branch transitions of CO perturbed by CO, N2, and CO2
Author(s) -
Paul S. Hsu,
Hans U. Stauffer,
Naibo Jiang,
James R. Gord,
Sukesh Roy
Publication year - 2019
Publication title -
applied optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.668
H-Index - 197
eISSN - 2155-3165
pISSN - 1559-128X
DOI - 10.1364/ao.58.0000c1
Subject(s) - laser linewidth , picosecond , atomic physics , raman spectroscopy , spectroscopy , raman scattering , doppler broadening , line (geometry) , materials science , spectral line , spectral line shape , coherent anti stokes raman spectroscopy , quantum number , carbon monoxide , rotational transition , physics , optics , chemistry , laser , angular momentum , biochemistry , geometry , mathematics , quantum mechanics , astronomy , catalysis
We report direct measurement of collisional line-broadening coefficients associated with rotational Raman transitions of carbon monoxide (CO), obtained using time-resolved picosecond rotational coherent anti-Stokes Raman scattering spectroscopy. The dependencies of the CO self-broadening coefficients on rotational quantum number, J , and temperature are described for the J =3 - 16 lines of S -branch ( Δ J =+2) transitions for T =295 - 600 K at atmospheric pressure. Further, we report collisional linewidths of CO and collision partners N 2 and CO 2 . The obtained S -branch linewidths of self-broadened CO agree well with previously reported frequency-domain experimental spectroscopy results, whereas the mixture-linewidth broadening coefficients differ from reported theoretical results by up to 80%.