Communication: Time-domain measurement of high-pressure N2 and O2 self-broadened linewidths using hybrid femtosecond/picosecond coherent anti-Stokes Raman scattering

Language
en
Document Type
Article
Issue Date
2012-11-07
Issue Year
2011
Authors
Miller, Joseph D.
Roy, Sukesh
Gord, James R.
Meyer, Terrence R.
Editor
Abstract

The direct measurement of self-broadened linewidths using the time decay of pure-rotational hybrid femtosecond/picosecond coherent anti-Stokes Raman scattering (fs/ps RCARS) signals is demonstrated in gas-phase N2 and O2 from 1–20 atm. Using fs pump and Stokes pulses and a spectrally narrowed ps probe pulse, collisional dephasing rates with time constants as short as 2.5 ps are captured with high accuracy for individual rotational transitions. S-branch linewidths of N2 and O2 from ∼0.06 to 2.2 cm−1 and the line separation of O2 triplet states are obtained from the measured dephasing rates and compared with high-resolution, frequency-domain measurements and S-branch approximations using the modified exponential gap model. The accuracy of the current measurements suggests that the fs/ps RCARS approach is well suited for tracking the collisional dynamics of gas-phase mixtures over a wide range of pressures.

Journal Title
Journal of Chemical Physics 135.20 (2011): 06.11.2012 <http://jcp.aip.org/resource/1/jcpsa6/v135/i20/p201104_s1>
Citation
Journal of Chemical Physics 135.20 (2011): 06.11.2012 <http://jcp.aip.org/resource/1/jcpsa6/v135/i20/p201104_s1>
DOI
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