Predissociation spectroscopy of cadmium dimethyl

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Abstract
The absorption and fluorescence excitation spectra of jet cooled Cd(CH3)2 and Cd(CD3)2 were measured in the structured region between 230 and 200 nm. The symmetric Cd–methyl stretch and methyl umbrella modes in the second excited electronic state of the latter molecule were found to the 304 and 790 cm−1, respectively. Widths of the 0–0 lines (FWHM) were 101 and 25 cm−1, respectively from which lifetimes of 53 and 265 fs were deduced. A weak fluorescence due to CdCH3 is excited by the absorption of Cd(CH3)2 and an even weaker fluorescence is excited in Cd(CD3)2. The quantum yield of this fluorescence is below 10−4 at the electronic origin of the structured band and increases to about 10−3 above 2000 cm−1 vibrational energy.