High-resolution diode laser absorption spectroscopy of the O-H stretch overtone band (2,0,0)←(0,0,0) of the HO2 radical |
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Authors: | John D. DeSain Andrew D. Ho |
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Affiliation: | a The Aerospace Corporation, M5/754, P.O. Box 92957, Los Angels, CA 90009-2957 USA b Combustion Research Facility, Sandia National Laboratories, Mail Stop 9055, Livermore, CA 94551-0969, USA |
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Abstract: | The O-H stretching overtone (2ν1) of the HO2 radical was observed between 6603.2 to by using tunable diode laser absorption spectroscopy (TDLAS). About 1000 lines were observed in this region of which 491 transitions could be definitively assigned to the 2ν1. The spectrum is observed to be an A/B hybrid band with band features of both a perpendicular and parallel nature. Transitions of the A-type bands with Ka′=0-3, N′?16 and transitions of the B-type bands with Ka′=0,1, N′?15 were assigned. The origin calculated from the best fit to the present spectrum is at which is ∼ higher than previously reported. The overtone spectrum is observed to be heavily perturbed, possibly by Fermi resonance with energy levels of the nearby (ν2+5ν3) state. |
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Keywords: | HO2 radical Overtone Infrared spectroscopy Diode laser |
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