Abstract Multiphoton Ionization (MP) Mass Spectra of n-C3H7I AND i-C3H7I are obtained using a time-offlight mass spectrometer at 532 nm. No parentions are observed in MPI of both isomers. N-propyl cation dissociates more extensively than isopropyl cation. The C2H+5(M/Z=29) ion is observed instead of C2H+4(M/Z=28) ion in MPI of n-C3H7I, in contrast to i-C3H7I. It is found that parent molecules are first two-photon resonantly excited to A-band, then go through dissociation. Fragment ions are produced by ionization and dissociation of neutral fragments. We present directly the diss ociation pathways of n-propyl cation according to the results proposed by Levine using maximum entropy formalism. Moreover, those of isopropyl cation are discussed in this paper through branching ratio analyses.
Received: 28 June 1997
Revised: 29 September 1997
Accepted manuscript online:
PACS:
33.80.Rv
(Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states))
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