FREQUENCY-COMB REFERENCED, SUB-DOPPLER SPECTROSCOPY OF HOT BANDS OF ACETYLENE IN THE REGION OF THE $\nu_1+\nu_3$ COMBINATION BAND
Creators:McRaven, Christopher P.
Cich, Matthew J.
Caiola, Salvatore M.
Sears, Trevor J.
Hall, Gregory E.
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Publisher:Ohio State University
To take full advantage of recent improvements in the accuracy obtained in collision-induced absorption line shape measurements of the acetylene $\nu_1+\nu_3$ combination band, independent and accurate knowledge of the positions of weaker, overlapping hot band transitions is required. We have used cavity-enhanced saturation-absorption spectroscopy together with a frequency-comb referenced, extended cavity diode laser to determine Doppler-free transition frequencies for the $\nu_4$ and $\nu_5$ hot band transitions in this region . A laser intensity dependent asymmetry in the sub-Doppler saturation line shape is observed, and will be discussed in terms of the intra-cavity beam geometry. Acknowledgments: Work at Brookhaven National Laboratory was carried out under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy and supported by its Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences and Biosciences.
Author Institution: Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973; Department of Chemistry, Stony Brook University, Stony Brook, New York 11794; Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973; Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973
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