Mass selected resonance enhanced multiphoton ionization spectroscopy of aniline-Arn (n=3,4,5,...) van der Waals complexes

Abstract

The origin region of the S1 ← S0 transitions of the aniline-Ar3, aniline-Ar4, and aniline-Ar5 molecules have been measured using mass selected resonance enhanced, multiphoton ionization (REMPI) spectroscopy. The aniline-Ar3 spectrum exhibits two distinct groups of peaks. The more prominent group displays a regular vibrational progression, with five obvious members and a spacing of ∼16 cm-1. Vibrational structure in the other group is less distinctive. On the basis of cluster potential calculations described in this paper, we believe that two stable aniline-(argon)3 isomers exist in the supersonic expansion and that the two groups of peaks correspond to absorption by these two isomers. Spectr..