Abstract

Very short lived resonances can cause unobservably small yields of resonant multiphoton ionization (MPI) processes, and severely alter the photofragmentation pattern of the resulting ions.¹ These effects, which are frequently observed when using high lying electronic states of medium size or large molecules, are usually interpreted as a consequence of fast intramolecular processes such as internal conversion (IC), intersystem crossing (ISC), Intramolecular Vibrational redistribution (IVR) or Photodissociation. In the present paper we investigate the interplay of such dynamical phenomena with the laser pulse characteristics. To illustrate the range of possible effects we investigated the photoionization of aniline (C₆H₅NH₂), phenanthrene (C₁₄H₁₀), azulene(C₁₀H₈) and carbon disulfide (CS₂).

© 1994 Optical Society of America