Microwave a-dipole transitions of CH2DOH and CHD2OH in excited torsional states

Previously identified, measured, and rotationally assigned bur unpublished J = 0-1 and 1-2 microwave n-dipole Lines for excited states of the torsion for CH2DOH and CHD2OH are given torsional assignments for the first four ex cited states. The troublesome assignments were for the K-1 = 0 lines of the o(2) state of CH2DOH and the e(2) state of CHD2OH, where a resonance is fo und for the J(OJ) levels. The assignment for these slates was faclilitated by combination differences with the b- or c-dipole intratorsional state tra nsitions, relative intensities, and FIR combination differences for the e(2 ) and e(3) states of CH2DOH. A few new b- and c-dipole assignments are repo rted for o(2) of CH2DOH and e(2) of CHD2OH. Transitions for these two state s have been analyzed to estimate the strength of the resonant interaction a nd energy difference for the levels involved and to estimate how well the t heory is predicting the K-1-dependent torsional energy levels. The empirica lly determined Delta B and Delta C from nonrigidity for each species for th e four excited states should prove helpful for future calculations of vibra tion-internal rotation-overall rotation interactions in these molecules. (C ) 1998 Academic Press.