Study of the ν3 and 2ν3 ← ν3 bands of 12CH3F by infrared laser sideband and submillimeter-wave spectroscopy

Sang K. Lee, R. H. Schwendeman, Richard L. Crownover, David D. Skatrud, Frank C. De Lucia

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


An infrared laser sideband spectrometer operating in the CO2 laser region with 8- to 18-GHz sidebands has been used to record 266 transitions in the ν3 band and 84 transitions in the 2ν3 ← ν3 band of 12CH3F. The accuracy of the measured frequencies is estimated to be 1-3 MHz. A millimeter/submillimeter-wave spectrometer has been used to record the spectra of 48 pure rotational transitions in the ground vibrational state and 55 transitions in the v3 = 1 vibrational state with an accuracy of 20-90 kHz. The new measurements have been combined with previous radio frequency and infrared laser results to derive sets of constants for the ground, v3 = 1, and v3 = 2 states for this molecule. Tables of the vibrational dependence of the parameters and of the near coincidences of the ν3 and 2ν3 ← ν3 band transitions with CO2 laser frequencies are given.

Original languageEnglish (US)
Pages (from-to)145-160
Number of pages16
JournalJournal of Molecular Spectroscopy
Issue number1
StatePublished - May 1987
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry


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