Abstract
Silver atom clusters are produced in a supersonic molecular beam with pulsed-nozzle laser vaporization. Mass-resolved two-photon photoionization produces an electronic spectrum for the trimer (Ag 3) with an origin at 27010±10 cm −1 (3.35 eV). Vibronic structure extending over 1500 cm −1 involves cleanly resolved bands at low energy merging to a quasi-continuum at higher energy. Vibronic analyses are considered for a triangular structure with or without Jahn-Teller distortion in the excited state. No simple analytic expression successfully fits the level structure. However, the spectrum is qualitatively consistent with dynamic Jahn-Teller interaction for a hindered pseudorotor with an excited state barrier of about 200 cm −. Vibrational frequencies are 161.1 cm −1 (stretch) and 96.3 cm −1 (bend).
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