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ABSTRACT: The mechanisms of ionization and dissociation of cyclohexanone (C6H10O) in a 90 fs, 788 nm linearly polarized laser field ranging from 1013 to 1014 W/cm2 by a time-of-flight mass spectrometer (TOF-MS) have been investigated. The ion yields as a function of laser intensity have
been measured experimentally. By comparison with the Ammosov-Delone-Krainov (ADK) theory based on a hydrogen-like model, the
ionization mechanism of cyclohexanone in this intense femtosecond laser field has been understood. Considering the importance
of molecular nuclear motions, we propose that the Franck-Condon (F-C) factor can provide the excess vibrational energy in
the molecular ion. This energy is required for the decomposition of the molecular ion which finally results in the observed
mass spectrum.
Laser Physics 04/2012; 19(8):1671-1676. · 3.61 Impact Factor
