Abstract
The two-photon spectrum of the acetaldehyde−Ar complex has been measured in the vicinity of the (n,3s) Rydberg transition of the acetaldehyde monomer. The cluster spectrum is blue shifted by 14 cm-1 from the monomer origin. The vibrational analysis yields harmonic frequencies of 32, 27, and 21 cm-1 for the intermolecular modes. The two high-frequency modes are Franck−Condon active, indicating a substantial displacement of the minimum configuration with respect to the ground-state equilibrium structure. The abrupt disappearance of the vibrational structure at energies of about 190 cm-1 above the origin is interpreted as the dissociation limit of the complex.
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