Analysis of the ν2/ν4 dyad of 12CH4 and 13CH4

Details Analysis of the ν2/ν4 dyad of 12CH4 and 13CH4 Analysis of the ν2/ν4 dyad of 12CH4 and 13CH4

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jmosp.133..256c&link_type=abstract

Journal of Molecular Spectroscopy, Volume 133, Issue 2, p. 256-272.

Physics

42

Scientific paper

The reanalysis of the ν2/ν4 dyad of 12CH4 and the first detailed analysis of the same dyad of 13CH4 have been carried out using new infrared measurements combined with previously published microwave data. The line positions of the ν2/ν4 dyad near 7 μm have been measured with a precision of 0.00006 cm-1 using 0.0055 and 0.011 cm-1 resolution spectra recorded with the Fourier Transform spectrometer at Kitt Peak National Observatory/National Solar Observatory. Using a sixth order reduced Hamiltonian, the ground state and the ν2/ν4 upper state parameters have been adjusted simultaneously. Standard deviations of 0.065 10-3 cm-1 involving data through J = 23 for 12CH4 and 0.062 10-3 cm-1 involving data through J = 19 for 13CH4 have been obtained. Over 7100 infrared transitions of methane (with strengths greater than 10-6 cm-2 atm-1 at 296 K in natural isotopic abundance) have been calculated. The majority of the predicted line positions have individual standard deviations of 10-4 cm-1 or better.

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