Abstract

A cw dye laser is tuned over the B, A ← X transitions of Na 2/K 2 while a second laser or a high pressure lamp ionizes the excited states. The ions are detected by mass-spectrometry in the mixture of metal-atom clusters formed in a molecular nozzle beam. The vibronic and gyrovibronic spectra obtained show the correct intensities as compared to laser-induced fluorescence. Perturbations of certain Na 2 A ← X by the a 3Π manifold and of K 2 B ← X transitions by autoionizing levels are detected. The laser power dependence of the spectral intensities has been clarified.

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