15min:

M. JACKSON, Department of Physics, New Mexico State University, Las Cruces, NM 88003; G. R. SUDHAKARAN, E. GANSEN, Department of Physics, University of Wisconsin, La Crosse, WI 54601; I. MUKHOPADHYAY, Laser Programme, Centre for Advanced Technology, Indore, India, 452 013; AND R. M. LEES, Department of Physics, University of New Brunswick, Fredericton, New Brunswick, Canada E3B 5A3.

The Stark spectrum of ¹³CD₃OD has been investigated in the far-infrared region using the HCN and DCN lasers. The spectra were taken at room temperature for both parallel and perpendicular polarizations using electric fields up to 60~000 \fracVcm. An extensive series of absorption lines observed with the 337 µm line has been assigned to the J = 9 to 15 members of the K~=~5~<-~4~E₂ Q-branch in the \upsilon_t~=~1 torsional state. Further analysis of this Q-branch multiplet has yielded the branch origin, ₀ = 882~847.7 MHz, and expansion coefficients, a = 93.6785 MHz and b = -0.2689 MHz. An R-branch transition observed at 337 µm has been assigned as J_K~=~9₇~<-~8₆~A~\upsilon_t~=~0. Two families of resonances observed with the 195 µm line have been tentatively identified as members of the Q-branch multiplet J_K~=~J₇~<-~J₈~E₂~\upsilon_t~=~2 for J = 11 and 12. Zero-field frequencies for all assigned transitions are given with improved accuracy over those calculated from the available molecular constants.