A PHOTODISSOCIATION STUDY OF 1,3-BUTADIENE
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Laser-ion beam photodissociation is used to study the C4H 6+ radical cation formed by electron impact (70 eV nominal energy) ionization of 1,3-butadiene. The kinetic energy release value obtained from C4H6+ C3H 3+ + CH3 does not agree with the distribution reported by Farrar [J. Chem. Phys. 77, 263 (1982)]. The photodissociation studies of C4H6+ suggest the existence of a long-lived (> 0.05 10-6 s) photoexcited C 4H6+ ion. Also, results of photodissociation studies of C4H6+ trapped in the electron beam space charge are consistent with the proposed long-lived photoexcited C 4H6+ ion. Therefore, it is proposed that the two-photon photodissociation of C4H6+ reported by Baer [J. Chem. Phys. 85, 6361 (1986)] is a sequential two-step process involving a long-lived excited C4H6+ ion. 1988 American Institute of Physics.
