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Title: Frequency measurements and self-broadening of sub-Doppler transitions in the v1 + v3 band of C2H2

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.5047410· OSTI ID:1473639
 [1]; ORCiD logo [1];  [2]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). Division of Chemistry, Department of Energy and Photon Sciences
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Division of Chemistry, Department of Energy and Photon Sciences ; Stony Brook Univ., NY (United States). Dept. of Chemistry

Here, frequency comb-referenced measurements of sub-Doppler laser saturation dip absorption lines in the v1 + v3 band of acetylene near 1:5 μm are reported. These measurements include transitions involving higher rotational levels than previously frequency measured in this band. The accuracy of the measured frequencies is typically better than 10 kHz. Measurements of the observed sub-Doppler line widths as a function of pressure showed that the self pressure-broadening coefficients are about 3.5 times larger than those derived from conventional pressure broadening of unsaturated Doppler-limited spectra. This is attributed to the contribution of velocity-changing collisions to the total dephasing rate in the low pressure sub-Doppler measurements. At higher pressures, when the homogeneous broadening becomes comparable to the typical Doppler shift per elastic collision, the velocity changing collisions cease to contribute significantly to the incremental pressure broadening. Lastly, a time-dependent soft collision model is developed to illustrate the transition between low and high pressure regimes of sub-Doppler pressure-broadening.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division
Grant/Contract Number:
SC0012704
OSTI ID:
1473639
Alternate ID(s):
OSTI ID: 1478275
Report Number(s):
BNL-209076-2018-JAAM
Journal Information:
Journal of Chemical Physics, Vol. 149, Issue 15; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 10 works
Citation information provided by
Web of Science

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Cited By (2)

A well-isolated vibrational state of CO 2 verified by near-infrared saturated spectroscopy with kHz accuracy journal January 2020
Frequency metrology of molecules in the near-infrared by NICE-OHMS journal January 2019

Figures / Tables (6)


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