Frequency Comb-referenced Measurements of Self- and Nitrogen-broadening in the m1 + m3 Band of Acetylene

We report measurements of self- and nitrogen-pressure broadening of the P(11) line in the ?{sub 1} + ?{sub 3} 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 a...

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Bibliographic Details
Published in:Journal of molecular spectroscopy 2011-03, Vol.266 (1)
Main Authors: McRaven, C.P., Cich, M.J., Lopez, G.V., Sears, T.J., Hurtmans, D., Mantz, A.W.
Format: Article
Language:English
Subjects:
ABSORPTION
ACETYLENE
ATOMIC AND MOLECULAR PHYSICS
frequency comb
LASERS
pressure broadening
RADIATIONS
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Summary:We report measurements of self- and nitrogen-pressure broadening of the P(11) line in the ?{sub 1} + ?{sub 3} 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{sup -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.
ISSN:0022-2852
1096-083X
DOI:10.1016/j.jms.2011.02.016