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Multiphoton dissociation dynamics of the indenyl radical at 248 nm and 193 nm.

Authors :
Sullivan, Erin N.
Nichols, Bethan
von Kugelgen, Stephen
da Silva, Gabriel
Neumark, Daniel M.
Source :
Journal of Chemical Physics. 11/7/2019, Vol. 151 Issue 17, pN.PAG-N.PAG. 11p. 1 Diagram, 3 Charts, 6 Graphs.
Publication Year :
2019

Abstract

Photofragment translational spectroscopy is used to investigate the unimolecular photodissociation of the indenyl radical (C9H7). C9H7 radicals are generated by photodetachment of C9H7− anions and are dissociated at 248 nm (5.00 eV) and 193 nm (6.42 eV). The following product channels are definitively observed at both wavelengths: C2H2 + C7H5, C2H2 + C3H3 + C4H2, and C2H2 + C2H2 + C5H3. The three-body product channels are energetically inaccessible from single photon excitation at either dissociation wavelength. This observation, in combination with calculated dissociation rates and laser power studies, implies that all dissociation seen in this experiment occurs exclusively through multiphoton processes in which the initial C9H7 radical absorbs two photons sequentially prior to dissociation to two or three fragments. The corresponding translational energy distributions for each product channel peak well below the maximum available energy for two photons and exhibit similar behavior regardless of dissociation wavelength. These results suggest that all products are formed by internal conversion to the ground electronic state, followed by dissociation. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00219606
Volume :
151
Issue :
17
Database :
Academic Search Index
Journal :
Journal of Chemical Physics
Publication Type :
Academic Journal
Accession number :
139564624
Full Text :
https://doi.org/10.1063/1.5121294