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 Title: RELATIVE INTENSITY OF A CROSS-OVER RESONANCE TO LAMB DIPS OBSERVED IN STARK SPECTROSCOPY OF METHANE Author(s): Okuda, Shoko Contributor(s): Sasada, Hiroyuki Subject(s): Small molecules Abstract: Last ISMS, we reported on Stark effects of the $nub{3}$ band of methane observed with a sub-Doppler resolution spectrometer. We determined the rotation-induced permanent dipole moment (PEDM) in the vibrational ground state and the vibration-, rotation-, and Coriolis-type-interaction-induced PEDMs in the $v_{3}=1$ state. _x000d_ _x000d_ begin{wrapfigure}{r}{9cm}_x000d_ includegraphics[width=9cm]{abstfig.eps}_x000d_ end{wrapfigure}_x000d_ Figure illustrates Stark modulation spectrum of the $Q(6)E$ with the external electric field of 31.0 kV/cm and the selection rule of $Delta M=pm1$, where $M$ is the magnetic quantum number. The $Delta M=1$ and $-1$ components of the Lamb dips labeled by $A$ and $B$ are resolved, and the central component $C$ is identified with the cross-over resonance. The Lamb dips are assigned to the magnetic quantum numbers of the lower and upper states, $(M'',M')$ according to the Clebsch-Gordan coefficients. We found that the relative intensity of the cross-over resonance to the associated Lamb dips depends on the $P$, $Q$, and $R$ branches. We ascribe the dependence to the collisional relaxation processes._x000d_ Issue Date: 6/20/2017 Publisher: International Symposium on Molecular Spectroscopy Citation Info: APS Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/96925 DOI: 10.15278/isms.2017.TK01 Date Available in IDEALS: 2017-07-27
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