Photofragment imaging: The 266-nm photolysis of CD sub 3 I

Journal Article · Thu Jun 14 04:00:00 EDT 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100375a017· OSTI ID:6329411

Chandler, D W ^[1]; Janssen, M H.M. ^[2]; Stolte, S ^[3]; Strickland, R N ^[4]; Thoman, Jr, J W ^[5]; Parker, D H ^[6]

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1. Sandia National Laboratories, Livermore, CA (USA)
2. Catholic Univ. of Nijmegen (Netherlands)
3. Free Univ., Amsterdam (Netherlands)
4. Univ. of Arizona, Tucson (USA)
5. Williams College, Williamstown, MA (USA)
6. Univ. of California, Santa Cruz (USA)

Internal state and velocity distributions of methyl fragments from the 266-nm photodissociation of CD{sub 3}I in a supersonic beam are measured by using photofragment imaging. Methyl radicals are state-selectively ionized by using (2+1) resonance-enhanced multiphoton ionization (REMPI) via the 3p{sub z} Rydberg state, and the imaging technique records the velocity distribution of the ions. A line-by-line rotational analysis of the 3p{sub z}{l arrow}{tilde X} 0{sup 0}{sub 0} band, including conservation of the parent molecule's ortho:para ratio in the planar fragment molecules, indicates that about 90 cm{sup {minus}1} of rotational excitation about a C{sub 2} axis in CD{sub 3} results from the photolysis. The photodissociation appears to conserve the initial (low) rotational excitation about the C{sub 3} axis of the (cold) parent molecule. From the previously derived 3p{sub z}-{tilde X} Franck-Condon factors the branching ratio for the v = 2/v = 0 levels of the umbrella mode is determined to be 1.15 {plus minus} 0.13.

• OSTI ID: 6329411
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:12; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
CHEMICAL REACTIONS
DATA
DATA ANALYSIS
DECOMPOSITION
DEUTERIUM COMPOUNDS
EXPERIMENTAL DATA
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROGEN COMPOUNDS
INFORMATION
IODINATED ALIPHATIC HYDROCARBONS
MEASURING INSTRUMENTS
MEASURING METHODS
METHYL IODIDE
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC IODINE COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS