The photodissociation dynamics of tetrachloroethylene

Journal Article · Thu Apr 28 04:00:00 EDT 2011 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.3580282· OSTI ID:21560198

Herath, Nuradhika; Hause, Michael L; Suits, Arthur G ^[1]

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1. Department of Chemistry, Wayne State University, Detroit, Michigan 48202 (United States)

We present a direct current slice imaging study of tetrachloroethylene (C{sub 2}Cl{sub 4}) photodissociation, probing the resulting ground state Cl ({sup 2}P{sub 3/2}) and spin-orbit excited state Cl* ({sup 2}P{sub 1/2}) products. We report photofragment images, total translational energy distributions and the product branching ratio of Cl*/Cl following dissociation at 235 and 202 nm, obtained using a two-color reduced-Doppler dissociation/probe. Near 235 nm, the Cl translational energy distribution shows a peak at the limit of the available energy, indicating a direct dissociation through a {sigma}*(C-Cl) (leftarrow){pi} (C=C) transition, which is superimposed on a broader underlying distribution. The ground state Cl image and associated translational energy distribution at 202 nm is broad and peaked at lower energy, suggesting either internal conversion to the ground state or a lower excited state prior to dissociation. The Cl* images are similarly broad at both wavelengths. The branching ratio is presented as a function of recoil energy, but after integration shows a near-statistical average of Cl:Cl* as 70:30 at both wavelengths. All the images are largely isotropic, with anisotropy parameters ({beta}) of 0.05 {+-} 0.03.

• OSTI ID: 21560198
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 16 Vol. 134; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
74 ATOMIC AND MOLECULAR PHYSICS
ANISOTROPY
BRANCHING RATIO
CHEMICAL REACTIONS
COLLISIONS
CONVERSION
CURRENTS
DECAY
DECOMPOSITION
DIMENSIONLESS NUMBERS
DIRECT CURRENT
DISSOCIATION
DISTRIBUTION
DOPPLER EFFECT
ELECTRIC CURRENTS
ENERGY LEVELS
ENERGY SPECTRA
EXCITED STATES
GROUND STATES
IMAGES
INTERNAL CONVERSION
MOLECULE COLLISIONS
NUCLEAR DECAY
ORGANIC COMPOUNDS
PEAKS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
PHOTON COLLISIONS
PHOTON-MOLECULE COLLISIONS
PROBES
SPECTRA
WAVELENGTHS