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Abstract:
Vibrationally resolved ionization probabilities have been recorded for laser-desorbed jet-cooled diphenylamine via the mass analyzed threshold ionization (MATI) technique. The observed MATI spectra from selected laser-prepared vibrational levels in the first electronically excited singlet state of DPA are a clear demonstration of the Franck—Condon principle upon ionization. The shape of the vibrational wavefunction in the intermediate electronic state is seen directly reflected in the spectra.