Dissociation of benzylamine ions following infrared multiple photon absorption, electron impact ionization, and UV multiphoton ionization

Journal Article · Sun May 01 04:00:00 EDT 1983 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1002/chin.198333104· OSTI ID:6238701

Catanzarite, J H; Haas, Y; Reisler, H; Wittig, C

The dissociation of benzylamine ions following (i) electron impact (EI) ionization, (ii) multiphoton ionization (MPI) at 266 nm, and (iii) infrared multiple photon absorption (IRMPA) at 9.26 ..mu..m is reported. In the EI and MPI experiments, three competitive dissociation pathways are observed. In the IRMPA experiments, benzylamine ions prepared by MPI at low fluences are fragmented very efficiently following irradiation with the focused output from a pulsed CO/sub 2/ laser. However, in contrast to the EI and MPI results, the IRMPD experiments reveal only a single, lowest energy, dissociation pathway and the fragmentation pattern is consistent with a sequential mechanism in which daughter ions continue to absorb the IR radiation and dissociate. The differences are explained by the different natures of the excitation processes: in IRMPA, the relatively slow up-pumping rate and the long rise time of the CO/sub 2/ laser pulse restrict the levels of excitation in the dissociating parent ions and favor sequential processes along the lowest energy decomposition pathways.

• Research Organization: Departments of Electrical Engineering, Physics, and Chemistry, University of Southern California, Los Angeles, California 90089-0484
• OSTI ID: 6238701
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 78:9; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION
AROMATICS
CHARGED PARTICLES
COLLISIONS
DISSOCIATION
ELECTROMAGNETIC RADIATION
ELECTRON COLLISIONS
ELECTRON-ION COLLISIONS
INFRARED RADIATION
ION COLLISIONS
IONIZATION
IONS
MOLECULAR IONS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHOTOIONIZATION
RADIATIONS
ULTRAVIOLET RADIATION