Observation of the dipole-bound excited state of the I−⋅acetone ion-molecule complex

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Abstract
Photofragmentation action spectra of the I−⋅acetone ion‐molecule complex reveal the existence of an excited state, located just below the electron detachment threshold, which is thought to correspond to a dipole‐bound state derived primarily from the electric dipole moment of acetone. The excited state relaxes by fragmentation into the acetone anion, a dipole‐bound ground state anion. This type of excited state should be a general property of ion‐molecule complexes, X−⋅M, where M has a significant dipole moment and X does not, and is a microscopic precursor of the charge transfer to solvent bands observed for anions in dipolar solvents.