Photodissociation dynamics of CBr{sub 4} at 267 nm by means of ion velocity imaging

Journal Article · Sat Oct 07 04:00:00 EDT 2006 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.2213260· OSTI ID:20864305

Greene, Jamila R; Francisco, Joseph S; Dadong, Xu; Jianhua, Huang; Jackson, William M ^[1]

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1. Department of Chemistry, Purdue University, West Lafayette, Indiana 47907 (United States)

The photodissociation dynamics of CBr{sub 4} at 267 nm has been studied using time of flight (TOF) mass spectrometry and ion velocity imaging techniques. The photochemical products are detected with resonance enhanced multiphoton ionization (REMPI) as well as single-photon vacuum ultraviolet ionization at 118 nm. REMPI at 266.65 and 266.71 nm was used to detect the ground Br({sup 2}P{sub 3/2}) and spin-orbit excited Br({sup 2}P{sub 1/2}) atoms, respectively. The translational energy and angular distributions are consistent with direct dissociation from an excited triplet state and indirect dissociation from high vibrational levels on the singlet ground state surface. Br{sub 2}{sup +} ions are also observed in the TOF spectra with a focused 267 nm laser. The counter fragment, CBr{sub 2}{sup +}, is observed when this photolysis laser is unfocused, and photons at 118 nm are used to ionize the radical products. The translational energy distributions of the CBr{sub 2}{sup +} and Br{sub 2}{sup +} products can be momentum matched, which indicates that molecular Br{sub 2} elimination is one of the primary dissociation channels.

• OSTI ID: 20864305
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 13 Vol. 125; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ANGULAR DISTRIBUTION
BROMINATED ALIPHATIC HYDROCARBONS
BROMINE
DISSOCIATION
GROUND STATES
IONS
L-S COUPLING
MASS SPECTRA
MASS SPECTROSCOPY
MULTI-PHOTON PROCESSES
PHOTOCHEMISTRY
PHOTOIONIZATION
PHOTOLYSIS
PHOTON-MOLECULE COLLISIONS
PHOTONS
RADICALS
TIME-OF-FLIGHT METHOD
TRIPLETS
ULTRAVIOLET RADIATION
VIBRATIONAL STATES