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Chinese Optics Letters

Chinese Optics Letters


  • Vol. 5, Iss. 6 — Jun. 10, 2007
  • pp: 315–317

Multiphoton ionization and dissociation of CH3I at 266 and 355 nm

Li Li, Xianghe Kong, and Shudong Zhang  »View Author Affiliations

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

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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

OCIS Codes
(020.4180) Atomic and molecular physics : Multiphoton processes
(020.5780) Atomic and molecular physics : Rydberg states
(260.5210) Physical optics : Photoionization
(260.7190) Physical optics : Ultraviolet

Li Li, Xianghe Kong, and Shudong Zhang, "Multiphoton ionization and dissociation of CH3I at 266 and 355 nm," Chin. Opt. Lett. 5, 315-317 (2007)

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