Absorption and resonance Raman spectra of Pb2, Pb3, and Pb4 in xenon matrices

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Abstract
Lead metal was vaporized and trapped in solid xenon at 12 K. Electronic absorption and resonance Raman spectra were recorded of the resulting matrix, which was shown to contain Pb2, Pb3, and possibly Pb4 molecular species. The vibrational frequency for Pb2 is determined to be 108 cm−1 for the ground state, with a dissociation energy of ∼8200 cm−1. A D3h symmetry is suggested for the Pb3 species, with ν1=117 and ν2=96 cm−1. The existence of Pb4 is suggested by a fundamental and overtone of 111 cm−1 spacing.

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