Profiles of (υ′;υ″ = 0) bands recorded in excitation spectra using b~30_u~+← X~10_g~+ transitions in Cd_2 and B~31←X~10~+ transitions in CdAr

摘要

Profiles of the (υ′;υ″ = 0) vibrational bands recorded using the b~30_u~+← X~10_g~+ and B~31←X~10~+ transitions in Cd_2 and CdAr complexes, respectively, are presented and analysed. Specifically, CdAr and Cd_2 complexes are simultaneously propagating in a supersonic beam. Transitions in these complexes can be used to provide the conditions for selective detection of one of the complexes in the expansion. Extended analysis of the B~31- and b~30_u~+ -state vibrational progressions provided improved values for ω_e′x_e′ and ω_e′ vibrational characteristics, as well as D_e′ well depths and R_e′ bond lengths of the B~31- and b~30_u~+-state potentials. Several of the CdAr bands were recorded with partly resolved rotational structure. The new characterisation of the B31 state, along with results of the rotational and isotopic analyses of the band profiles, agrees with the most recent results of ab initio calculations, while results obtained for the b~30_u~+ state call for improvement in the ab initio calculations for Cd_2.