Applied Physics B

, Volume 109, Issue 3, pp 373–384

Temperature-dependent pressure broadened line shape measurements in the ν1+ν3 band of acetylene using a diode laser referenced to a frequency comb

  • M. J. Cich
  • C. P. McRaven
  • G. V. Lopez
  • T. J. Sears
  • D. Hurtmans
  • A. W. Mantz
Article

DOI: 10.1007/s00340-011-4829-0

Cite this article as:
Cich, M.J., McRaven, C.P., Lopez, G.V. et al. Appl. Phys. B (2012) 109: 373. doi:10.1007/s00340-011-4829-0

Abstract

Using an extended cavity diode laser referenced to a femtosecond frequency comb, the P(11) absorption line in the ν1+ν3 combination band of the most abundant isotopologue of pure acetylene was studied at temperatures of 296, 240, 200, 175, 165, 160, 155, and 150 K to determine pressure-dependent line shape parameters at these temperatures. The laser emission profile, the instrumental resolution, is a Lorentz function characterized by a half width at half the maximum emission (HWHM) of 8.3×10−6 cm−1 (or 250 kHz) for these measurements. Six collision models were tested in fitting the experimental data: Voigt, speed-dependent Voigt, Rautian–Sobel’man, Galatry, and two Rautian–Galatry hybrid models (with and without speed-dependence). Only the speed-dependent Voigt model was able to fit the data to the experimental noise level at all temperatures and for pressures between 3 and nearly 360 torr. The variations of the speed-dependent Voigt profile line shape parameters with temperature were also characterized, and this model accurately reproduces the observations over their entire range of temperature and pressure.

Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • M. J. Cich
    • 1
  • C. P. McRaven
    • 2
  • G. V. Lopez
    • 1
  • T. J. Sears
    • 1
    • 2
  • D. Hurtmans
    • 3
  • A. W. Mantz
    • 4
  1. 1.Department of ChemistryStony Brook UniversityStony BrookUSA
  2. 2.Chemistry DepartmentBrookhaven National LabUptonUSA
  3. 3.Service de Chimie Quantique et de Photophysique (Atomes, Molécules et Atmosphères)Université Libre de BruxellesBruxellesBelgium
  4. 4.Department of Physics, Astronomy and AstrophysicsConnecticut CollegeNew LondonUSA

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