TITLE

Coriolis-dependent Stark effect of the 2ν3 band of methane observed by saturated absorption spectroscopy

AUTHOR(S)
Sasada, Hiroyuki; Suzumura, Kotaro; Ishibashi, Chikako
PUB. DATE
November 1996
SOURCE
Journal of Chemical Physics;11/22/1996, Vol. 105 Issue 20, p9027
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We studied the vibration-induced dipole moment of methane by observing Stark-modulation spectra of the 2ν3 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), Q(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)] 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. © 1996 American Institute of Physics.
ACCESSION #
7639882

 

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