Hyperfine-resolved 3.4-μm spectroscopy of CH3I with a widely tunable difference frequency generation source and a cavity-enhanced cell: A case study of a local Coriolis interaction between the v1=1 and (v2,v6l)=(1,22) states

Sho Okubo, Hirotaka Nakayama, Hiroyuki Sasada

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Saturated absorption spectra of the ν1 fundamental band of CH3I are recorded with a cavity-enhanced cell and a tunable difference frequency generation source having an 86-cm-1 range. The recorded spectral lines are 250 kHz wide, and most of them are resolved into the individual hyperfine components. The Coriolis interaction between the v 1=1 and (v2,v6l)=(1,22) states locally perturbing the hyperfine structures is analyzed to yield the Coriolis and hyperfine coupling constants with uncertainties similar to those in typical microwave spectroscopy. The spectrometer has demonstrated the potential for precisely determining the energy structure in the vibrational excited states.

Original languageEnglish
Article number012505
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number1
Publication statusPublished - 2011 Jan 14


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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