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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 5,
  • Issue 6,
  • pp. 315-317
  • (2007)

Multiphoton ionization and dissociation of CH3I at 266 and 355 nm

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Abstract

The mechanisms of multiphoton ionization (MPI) and dissociation of CH3I have been studied using time-of-flight (TOF) mass spectrometer at 266 and 355 nm. MPI mass spectrum at 266 nm consists mostly of fragment ions. This is consistent with a neutral-fragment photoionization mechanism in which rapid one-photon dissociation occurs from the repulsive potential energy surface followed by MPI of neutral photofragments. The observation of parent ions at 355-nm excitation is indicative of parent-ionic ladder mechanism in which the parent ions are produced directly by two-photon excitation resonantly excited to Rydberg C state and then ionized through additional one-photon absorption to produce CH3I+. Fragment ions are produced by dissociation of CH3I+.

© 2007 Chinese Optics Letters

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