Buffer-gas pressure broadening for the (3 0(0) 1)III <-- (0 0 0) band of CO2 measured with continuous-wave cavity ring-down spectroscopy

Phys Chem Chem Phys. 2006 Jan 21;8(3):364-8. doi: 10.1039/b511772k. Epub 2005 Oct 31.

Abstract

Buffer-gas pressure broadening for the (3 0(0) 1)(III)<--(0 0 0) band of CO(2) in the 1600 nm region was investigated with continuous wave cavity ring-down spectroscopy within the temperature range 263-326 K. The measured absorption profiles were analyzed with Voigt functions. Pressure broadening coefficient, gamma(gas), and the temperature dependent parameter (broadening exponent), n, were determined for a variety of buffer gases: N(2), O(2), He, Ne, Ar, Kr and Xe. gamma(air) values estimated subsequently are 0.096(2) for R(0), 0.085(5) for P(8), 0.075(2) for P(16), 0.070(4) for P(26), and 0.069(2) for P(38) in units of cm(-1) atm(-1), where numbers in parentheses are one standard deviation in units of the last digits quoted. n(air) values are 0.77(4) for R(0), and 0.73(11) for P(8).

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Buffers
  • Carbon Dioxide / chemistry*
  • Gases / chemistry*
  • Hot Temperature
  • Models, Theoretical
  • Nitrogen / chemistry
  • Noble Gases / chemistry
  • Pressure
  • Spectrum Analysis / instrumentation
  • Spectrum Analysis / methods

Substances

  • Buffers
  • Gases
  • Noble Gases
  • Carbon Dioxide
  • Nitrogen