Photochemistry and Photophysics of Small Heterocyclic Molecules: 1. Multiphoton Ionization and Dissociation of N-Isopropyldimethyloxaziridine

Article abstract of DOI:10.1021/j100260a017

The resonantly enhanced visible multiphoton ionization spectrum of N-isopropyldimethyloxaziridine has been recovered over the wavelength region from 375 to 600 nm.Rydberg series have been observed and assigned to ns, np, and nd transitions, with n spanning the range from 3 to 6.These transitions are accompanied by changes in the vibrational energy of a ring deformation mode.The ionization potential for this molecule is estimated to be 8.84 eV from both the Rydberg series limits and the spectral changes accompanying the transitions from a three- to a four-photon requirement for ionization.Preliminary gas-phase photochemical results indicate a sharp energy dependence in the mechanism for dissociation.A one-photon pathway leads primarily to simple ring opening and an amide final product, while a second, multiphoton channel leads exclusively to the severing of two bonds and an acetone fragment.These results are compared with earlier theoretical predictions and experimental results.The unique advantages of multiphoton photochemistry for the production of novel species are discussed.