15min:

M. JACKSON, G. R. SUDHAKARAN, Department of Physics, University of Wisconsin, La Crosse, WI 54601; A. SILVEIRA JR., Department of Chemistry, SUNY at Oswego, Oswego, NY 13126; I. MUKHOPADHYAY, Laser Programme, Centre for Advanced Technology, Indore, India, 452 013; AND R. M. LEES, Department of Physics, University of New Brunswick, Fredericton, N.B., Canada E3B 5A3.

The Stark spectra of several methanol isotopomers (CH₃OD, ¹³CD₃OH, CD₃OH, and CD₃OD) have been investigated in the far-infrared region using the HCN and DCN lasers. The spectra were recorded at room temperature for both parallel and perpendicular polarizations using electric fields up to 60~000 V/cm. Numerous transitions have been observed with these laser lines for all isotopomers. The following transitions will be presented: for CH₃OD, J_K~=~6₄~<-~5₃~E₂~\upsilon_t~=~0, J_K~=~18₁~<-~18₀~E₂~\upsilon_t~=~1, J_K~=~14₆~<-~13₅~A~\upsilon_t~=~1; for ¹³CD₃OH, J_K~=~18₂~<-~17₁~A^-~\upsilon_t~=~0; and for CD₃OH, J_K~=~14₁~<-~15₀~E₂~\upsilon_t~=~1.

.1in

Analysis of the recently recorded FTFIR spectra for CD₃OD has yielded accurate zero-field frequencies belonging to the Q-branch multiplet for K~=~11~<-~10~E₂~\upsilon_t~=~0. By combining these results with the previously reported Stark fields for the J = 11 through 19 members, we have determined the electric dipole moment of this important molecular species for the first time.