Statistics – Applications
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jmosp.168..455h&link_type=abstract
Journal of Molecular Spectroscopy, Volume 168, Issue 2, p. 455-476.
Statistics
Applications
43
Scientific paper
The pentad system (ν1, ν3, 2ν2, ν2 + ν4, 2ν4) of methane 12CH4 has been reanalyzed with a partly reduced fourth-order (206 parameters) Hamiltonian for energy levels and a second-order (13 parameters) dipole moment expansion for infrared intensities. In addition to infrared data, new experimental observations have been used: infrared hot bands (pentad-dyad), Raman bands, and microwave transitions among ν3 levels. The obtained standard deviations (for J <= 18) have the same order of magnitude as the experimental accuracies (0.001-0.002 cm-1 for infrared or Raman wavenumbers, 80 kHz for microwave frequencies, and 8% for infrared intensities). In view of atmospheric or planetary applications, improved predictions of the infrared methane spectrum, including weak absorptions, are available. A prediction of the (pentad-pentad) spectrum is also given to suggest further possible microwave observations.
Champion Jean Paul
Hilico Jean-Claude
Tashkun S. A.
Toumi S.
Tyuterev Vl. G.
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