A1-A2 splitting of CH3D

Masashi Abe, Hideyuki Sera, Hiroyuki Sasada

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Sub-Doppler resolution spectroscopy of CH3D has been carried out from 88.6 to 93.1 THz. Thirty transitions of the ν1 and ν4 bands from the low-J and K = 3 levels are observed, and the A1-A2 splitting is resolved for twenty-three of the thirty transitions. The absolute frequencies are determined with a typical uncertainty of 4 kHz. The effective A1-A2 splitting constant of the K = 3 levels is 2h3,v=0 = (1.5641 ± 0.0026) Hz for the ground vibrational state, and those of the K = 3 levels for the v1 = 1 state and of the (K = 2, l = -1) and (K = 4, l = +1) levels for the v4 = 1 state are also determined.

Original languageEnglish
Pages (from-to)90-96
Number of pages7
JournalJournal of Molecular Spectroscopy
Publication statusPublished - 2015 Jun 1


  • A-A splitting
  • Difference frequency generation
  • Isotope methane
  • Mid-infrared
  • Optical frequency comb
  • Sub-Doppler resolution

ASJC Scopus subject areas

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


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