Accurate transition frequency list of the ν3 band of methane from sub-Doppler resolution comb-referenced spectroscopy

Masashi Abe, Kana Iwakuni, Sho Okubo, Hiroyuki Sasada

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


We have carried out sub-Doppler resolution spectroscopy of the ν3 band of 12CH4 using a difference-frequency-generation source, an enhanced cavity absorption cell, and an optical frequency comb, and we have added 150 lines to the transition frequency list published earlier [Opt. Express 19, 23878 (2011)]. It now covers 204 lines from the P(12) to R(8) transitions, involving 21 weak forbidden transitions, with a typical uncertainty of 3 kHz for allowed transitions and 12 kHz for forbidden transitions. The combination differences between the allowed and forbidden transitions enable us to determine a scalar rotational constant and three scalar distortion constants of the ground vibrational state with greatly reduced uncertainties.

Original languageEnglish
Pages (from-to)1027-1035
Number of pages9
JournalJournal of the Optical Society of America B: Optical Physics
Issue number4
Publication statusPublished - 2013 Apr

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Atomic and Molecular Physics, and Optics


Dive into the research topics of 'Accurate transition frequency list of the ν<sub>3</sub> band of methane from sub-Doppler resolution comb-referenced spectroscopy'. Together they form a unique fingerprint.

Cite this