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Frequency comb-referenced measurements of self- and nitrogen-broadening in the ν1 + ν3 band of acetylene

par McRaven, Christopher;Sears, Trevor;Cich, Matthew;Lopez, Gary;Hurtmans, Daniel ;Mantz, Arlan
Référence Journal of Molecular Spectroscopy, 266, 1, page (43-51)
Publication Publié, 2011-03

Article révisé par les pairs

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Résumé :

We report measurements of self- and nitrogen-pressure broadening of the P(11) line in the ν1 + ν3 combination band of acetylene at 195 739.649 5135(80) GHz by absorption of radiation emitted by an extended cavity diode laser referenced to a femtosecond frequency comb. Broadening, shift and narrowing parameters were determined at 296 K. For the most appropriate, hard collision, model in units of cm-1/atm, we find 0.146317(27), 0.047271(104) and -0.0070819(22) for the acetylene self-broadening, narrowing and shift, and 0.081129(35), 0.022940(74) and -0.0088913(25) respectively, for the nitrogen-broadening parameters. The uncertainties are expressed as one standard deviation (in parenthesis) in units of the last digit reported. These parameters are 2-3 orders of magnitude more precise than those reported in previous measurements. Similar analyses of the experimental data using soft collision and simple Voigt lineshape models were made for comparison. © 2011 Elsevier Inc. All rights reserved.