Abstract
A method of supersonic free-jet expansion beam combined with techniques of laser spectroscopy was used in investigation of vibrational and rotational structures in the 1 0 u + ( 5 1 P 1 ) and 11 u(5 1P 1) electronic energy states of Cd 2. Laser induced fluorescence (LIF) excitation and dispersed fluorescence spectra recorded at the 1 0 u + - X 1 0 g + and 1 1 u - X 1 0 g + transitions provided spectroscopic characteristics of the excited and ground states as well as a shape of the repulsive part of the ground-state potential energy curve (PEC). Rotational structures of the 228Cd 2 isotopomer recorded in the ( υ′, υ″) = (45,0) and (38,0) bands of the 1 0 u + ← X 1 0 g + and 1 1 u ← X 1 0 g + transitions, respectively, were used for a direct determination of the ground- and excited-state bond lengths. Moreover, the 11 u-state interatomic potential was obtained numerically using an inverted perturbation approach (IPA). The position and height of the 11 u-state potential barrier was determined and compared with results of ab initio calculation. Analysis of Condon-internal-diffraction (CID) profiles in the bound-free dispersed fluorescence spectrum resulted in determination of a degree of repulsion between two ground-state Cd atoms in the dimer, supporting a hypothesis of a covalent admixture to the dominant van der Waals (vdW) bonding.
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