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Absorption spectroscopy of the Cd2 excimer

Absorption spectrum of cadmium vapour is measured over the spectral range 300 - 326 nm with a high resolution concave grating spectrometer. Two systems of molecular bands at about 800 cm1 (A + B) and 1800 cm1 (C) from the center of the 326.1 nm Cd intercombination resonance line are observed, the latter for the first time. In order to explain the origin of these bands the temperature dependence of spectra as well as an effect of foreign gas on their intensity is measured. The results seem to indicate that the strongly structured band systems B and C are due to the excited state absorption from the bottom of one of the gerade states correlated with the 51P1+ 51S0 asymptote to a highly excited Rydberg ungerade states of the Cd2 excimer. The energy separation between the potential minima of the lower and the upper states is determined and the vibrational frequencies of the upper states involved are estimated. On the other hand, the 1 potential curve correlated with the 53P2+51S0 asymptote is deduced from the analysis of the diffuse band A which is interpreted as a satellite of the forbidden Cd line due to the 53P2 - 5'S0 transition.