Stark effects in the ν3 band of methane

Shoko Okuda, Hiroyuki Sasada

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Sub-Doppler resolution Stark-modulation spectra of 20 transitions in the ν3 band of methane have been recorded using a difference-frequency-generation source referenced to an optical frequency comb with a frequency uncertainty of a few kilohertz. First-order Stark shifts in the vibrational excited (v3 1) and ground states have been measured separately in the presence of an electric field up to 31 kV/cm. The observed spectra have been analyzed, taking into account the mixing of the vibration–rotation wave functions due to high-order vibration–rotation interactions. The permanent electric dipole moment constants induced by the vibration, rotation, and Coriolis-type terms in the v3 1 state, and those induced by rotation in the vibrational ground state, are determined as Pvib −16.827 mDebye, Prot′ = 18.6(4) μDebye, PCor = 10.4(17) μDebye, and Prot″ = 24.47(12) μDebye.

Original languageEnglish
Pages (from-to)2558-2568
Number of pages11
JournalJournal of the Optical Society of America B: Optical Physics
Issue number12
Publication statusPublished - 2017 Dec 1

ASJC Scopus subject areas

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


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