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H. SASADA, K. SUZUMURA AND C. ISHIBASHI, Department of Physics, Faculty of Science and Technology, Keio University, Yokohama 223, Japan.
Stark effect of the 23 band of methane was studied by saturation spectroscopy using an optical cavity absorption cell and a 1.6-µ m external cavity semiconductor laser. The magnitude of the determined dipole moments was dependent on the Coriolis sublevels. This dependence agreed with the higher-order dipole moment ,
\begindisplaymath µ\alpha\propto\ellßJ\gamma+Jß\ell\gamma \enddisplaymath
where µ is the dipole moment, \ell are the vibrational angular momenta, J are the total angular momenta, and (\alpha,ß,\gamma) is (x,y,z), (y,z,x), or (z,x,y) components of the molecule-fixed axes.