Coriolis-dependent Stark effect of the 2v3 band of methane observed by saturated absorption spectroscopy

Hiroyuki Sasada, Kotaro Suzumura, Chikako Ishibashi

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12 Citations (Scopus)


We studied the vibration-induced dipole moment of methane by observing Stark-modulation spectra of the 2v3 band centered at 1.66 μm. The spectral purity of an external cavity semiconductor laser and radiation density in a Fabry-Perot cavity absorption cell are sufficiently high to record sub-Doppler saturated absorption lines with a spectral resolution of 0.8 MHz. First-order Stark shifts of the E-type symmetry components in the P(2), Q(2), Q(4), g(5), R(2), R(4), and R(5) transitions were measured, and the vibration-induced dipole moments for the v3 = 2 state were determined. Their values clearly demonstrate the Coriolis-induced dipole term, yielding [5.79(5) + 0.440(18)×(2L-3)J mD for the JR level, where L is defined to be -(R+ 1), 0, and R for the R=J-1, J, and J+1 levels, R and J are rotational and total angular momentum quantum numbers, and numbers in parentheses are 90% confidence intervals in unit of the last digit.

Original languageEnglish
Pages (from-to)9027-9034
Number of pages8
JournalJournal of Chemical Physics
Issue number20
Publication statusPublished - 1996
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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