Wavenumbers,line strengths,and assignments in the Doppler-limited spectrum of formaldehyde from 2700 to 3000 cm−1 |
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Authors: | Linda R Brown Robert H Hunt Alan S Pine |
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Institution: | Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91103 USA;Department of Physics, Florida State University, Tallahassee, Florida 32306 USA;Lincoln Laboratory, Massachusetts Institute of Technology, Lexington, Massachusetts 02173 USA |
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Abstract: | The spectrum of H2CO from 2700 to 3000 cm?1 has been examined at Doppler-limited resolution using a tunable difference frequency laser spectrometer at Lincoln Laboratory. The wavenumbers and strengths of 4350 absorptions have been determined with an accuracy of 0.001 cm?1 and 5%, respectively. These data have been incorporated into the analysis of lower-resolution data from Florida State University to assign 72% of the observed absorptions to one of seven bands: ν3 +ν4 (a C-type band at 2655 cm?1), ν3 + ν6 (a B-type band at 2719.156 cm?1), ν1 (an A-type band at 2782.457 cm?1), ν5 (a B-type band at 2843.326 cm?1), ν2 + ν4 (a C-type band at 2905 cm?1), 2ν3 (an A-type band at 2999.5 cm?1) and ν2 + ν6 (a B-type band at 3000.066 cm?1). The band ν3 + ν4 has been observed for the first time, and the band center for 2ν3 has been corrected from a value of 2972 cm?1 to the value listed above. The effects of strong Fermi and Coriolis resonances on the spectra are discussed. |
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