The vibrational ground state of 12CH4 and 13CH4

Details The vibrational ground state of 12CH4 and 13CH4 The vibrational ground state of 12CH4 and 13CH4

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jmosp.133..244c&link_type=abstract

Journal of Molecular Spectroscopy, Volume 133, Issue 2, p. 244-255.

Physics

25

Scientific paper

Improved ground state constants of 12CH4 and 13CH4 have been obtained 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 Hamiltonian, the ground state and the ν2/ν4 upper states (J. P. Champion, J. C. Hilico, C. Wenger and L. R. Brown, J. Mol. Spectrosc.133, 256-272 (1989)) have been fitted simultaneously to within the precision of the data through J = 23 for 12CH4 and J = 19 for 13CH4. Absolute ground state energies and their standard deviations are given up to J = 30 for both isotopes. For Q- and R-branch transitions within the ground states, the statistical precisions from this study are similar (in the same order of magnitude) to the precision of microwave measurements.

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