Line strengths of the ν1 + ν4 band of 12CH4

Details Line strengths of the ν1 + ν4 band of 12CH4 Line strengths of the ν1 + ν4 band of 12CH4

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jmosp..96...94b&link_type=abstract

Journal of Molecular Spectroscopy, Volume 96, Issue 1, p. 94-105.

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Scientific paper

The line strengths of the ν1 + ν4 band of 12CH4 at 4223.5 cm-1 were measured using a leastsquares procedure that iterates between the observed spectrum and a synthetic spectrum calculated at correct instrumental and gas sample conditions. The methane spectrum was recorded at 0.011 cm-1 resolution with signal-to-noise ratios of 300 to 1 or better using a Fourier transform spectrometer at Kitt Peak National Observatory. Line assignments were evaluated and extended to upper state J of 13. The observed line strengths reflect significant perturbation by other states so that only portions of the band can be used to determine a band strength of 6.92 (2) cm-2 atm-1 at 296 K with a Herman-Wallis factor of (1 - 0.0035(2)m)2.

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