Research Article

High resolution CARS study of collisional broadening of the ν2 Q-branch of acetylene

  1. K. A. Vereschagin1,
  2. V. V. Smirnov1,
  3. E. T. H. Chrysostom2,
  4. J. W. Nibler2,*

Article first published online: 13 SEP 2000

DOI: 10.1002/1097-4555(200008/09)31:8/9<719::AID-JRS610>3.0.CO;2-4

Issue

Journal of Raman Spectroscopy

Journal of Raman Spectroscopy

Special Issue: Memorial Issue for N.I. Koroteev

Volume 31, Issue 8-9, pages 719–723, August - September 2000

Additional Information

How to Cite

Vereschagin, K. A., Smirnov, V. V., Chrysostom, E. T. H. and Nibler, J. W. (2000), High resolution CARS study of collisional broadening of the ν2 Q-branch of acetylene. Journal of Raman Spectroscopy, 31: 719–723. doi: 10.1002/1097-4555(200008/09)31:8/9<719::AID-JRS610>3.0.CO;2-4

Author Information

  1. 1

    General Physics Institute, Vavilov Str. 38, 117942 Moscow, Russia

  2. 2

    Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, USA

*Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, USA

Publication History

  1. Issue published online: 13 SEP 2000
  2. Article first published online: 13 SEP 2000
  3. Manuscript Accepted: 8 APR 2000
  4. Manuscript Received: 16 FEB 2000

Funded by

  • Civilian Research and Development Foundation. Grant Number: RP1–268
  • National Science Foundation. Grant Number: CHE-9014795

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Abstract

Coherent anti-Stokes Raman scattering (CARS) was used to measure line broadening and shifts for Q-branch lines in the CC symmetric stretch ostretch of acetylene for the pressure range 5–160 Torr. The Lorentzian linewidth contributions caused by rotationally inelastic collisions were separated from Doppler and instrumental contributions and the corresponding cross-sections for odd J lines from 7 to 15 were determined. The shifts of Q-line maxima with pressure were also studied and an average shift coefficient of −0.075 cm−1 amagat−1 was obtained. At low pressures, power broadening of the lines was seen and the extent of this is in agreement with estimates for saturation effects. Owing to this broadening, it was not possible to distinguish any motional narrowing caused by translational relaxation. Copyright © 2000 John Wiley & Sons, Ltd.

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