Abstract
Excitation spectrum of Cd 2 van der Waals complex was observed in a supersonic free-jet expansion beam. Cadmium dimers were seeded in argon environment (a carrier gas) while a pulsed dye laser served as an excitation light source. Well resolved structures of vibrational bands arising from transition between 1 u( 3Π u) and X0 g +( 1Σ g +) states were observed. Using a Birge–Sponer method for analyzing the vibrational excitation spectrum, the first-time determination of the spectroscopical potential parameters of the 1 u molecular state was performed. We obtained D′ e=723±10 cm −1, ω′ e=28.9±1.0 cm −1, ω′ e x′ e=0.260±0.002 cm −1 and R′ e=3.93±0.05 Å. The latter value was estimated with the help of the computer-simulation of the spectrum. The results are compared with recent results of ab initio calculation of Czuchaj et al. (Chem. Phys. Lett. 225 (1994) 233) and demonstrate a reasonable agreement.
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