Measurement and analysis of the infrared absorption spectrum of the 2ν2 band of 12CH4 |
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| Authors: | Robert H. Hunt J.E. Lolck Alan G. Robiette Linda R. Brown Robert A. Toth |
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| Affiliation: | Department of Physics, The Florida State University, Tallahassee, Florida 32306 USA;Department of Chemistry, University of Reading, Reading, RG6 2AD, United Kingdom;Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, California 91103 USA |
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| Abstract: | Approximately 500 infrared absorption lines with room-temperature strengths between 3 × 10?5 and 1 × 10?2 atm?1 were assigned to the 2ν2 band of 12CH4 in the region from 2930 to 3250 cm?1. These determine 207 of the 212 upper-state energy levels through J′ = 12 as well as a number of levels with J′ = 13 and 14. All but 17 of the levels with J′ ≤ 12 are calculated to 0.03 cm?1 or better on the basis of a Hamiltonion that contains Coriolis and Fermi interaction terms coupling the upper states of the five bands, 2ν4, ν2 + ν4, ν1, ν3, and 2ν2. |
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