Extended sub-Doppler resolution spectroscopy of the ν3 band of methane

Philip A. Kocheril, Charles R. Markus, Anne Marie Esposito, Alex W. Schrader, Thomas S. Dieter, Benjamin J. McCall

Research output: Contribution to journalArticlepeer-review


We have performed sub-Doppler resolution rovibrational spectroscopy of the ν3 band of methane (12CH4) in the mid-infrared using an optical parametric oscillator in a double-pass configuration for saturated absorption. An optical frequency comb was used for absolute frequency calibration. We have measured 22 methane line centers ranging from the P(13) to R(10) transitions with a typical uncertainty of 0.40 MHz. These measurements improve previously known transition frequencies by at least an order of magnitude.

Original languageEnglish (US)
Pages (from-to)9-12
Number of pages4
JournalJournal of Quantitative Spectroscopy and Radiative Transfer
StatePublished - Aug 2018


  • Methane
  • Mid-infrared
  • Sub-Doppler

ASJC Scopus subject areas

  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy


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