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Published May 15, 1984 | Published
Journal Article Open

Time-resolved two-color photoacoustic and multiphoton ionization spectroscopy of aniline

Abstract

The multiphoton ionization and photoacoustic signals from aniline have been detected as a function of time delay between two laser pulses of different wavelength. The first pulse excited the S0 → S1 0–0 transition. The second pulse either excited S1 to a higher singlet state, or a triplet state produced by intersystem crossing to a higher triplet state, depending on the time delay between pulses. Both ionization and dissociation processes are observed. By varying the conditions of excitation it appears that a given amount of energy can be selectively channeled almost exclusively into either ionization or dissociation pathways. The results are explained using a simple Franck–Condon factor model.

Additional Information

© 1984 American Institute of Physics. Received 21 September 1983; accepted 8 December 1983. Research supported in part by the U. S. Department of Energy (Contract No. DE-AS03-765F00767, Project Agreement No. DE-AT03-76ER720004). Work performed [by D.J.M.] in partial fulfillment of the requirements for the Ph.D. degree in Chemistry at California Institute of Technology. [D.J.M. was an] NSF Predoctoral Fellow. Arthur Amos Noyes Laboratory of Chemical Physics, Contribution No. 6914

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