Anomalous /C-13/H4:/C-12/H4 line strengths in 2 nu 3

Details Anomalous /C-13/H4:/C-12/H4 line strengths in 2 nu 3 Anomalous /C-13/H4:/C-12/H4 line strengths in 2 nu 3

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jchph..72.4657f&link_type=abstract

Journal of Chemical Physics, vol. 72, Apr. 15, 1980, p. 4657-4659.

Physics

Chemical Physics

8

Carbon 12, Carbon 13, Gas Spectroscopy, Isotope Effect, Methane, Spectral Line Width, Molecular Rotation, Vibrational Spectra, Infrared Spectra, Absolute And Relative Line And Band Intensities

Scientific paper

Anomalous intensity ratios between 2 nu 3 singlet lines of C-13 methane and C-12 methane are reported. Absolute strengths of the Q1, R0 and R1 singlets were measured for essentially pure samples of (C-13)H4 and (C-12)H4 at a resolution of 0.035 kaysers at pressures of 10 and 20 Torr, using a computer controlled grating spectrometer. Line strength ratios between the isotopic species are presented which demonstrate a dramatic effect of isotopic substitution on line strengths. If this effect can be observed in the 3 nu 3 vibration-rotation band of methane, which is widely used in planetary atmosphere studies, revision of the (C-12)H4/(C-13)H4 abundance ratios of the outer planets will be necessary.

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