Effect of intensity on fragment internal state distributions in the infrared multiphoton dissociation of vinyl cyanide

Journal Article · Mon Mar 01 04:00:00 EST 1982 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.443267· OSTI ID:5589397

Miller, C M; McKillop, J S; Zare, R N

The technique of laser induced fluorescence has been used to observe the C/sub 2/ and CN fragments produced in the infrared multiphoton dissociation of vinyl cyanide CH/sub 2/ = CHCN in a low pressure flowing gas. The rotational distributions of the lowest vibrational level of the C/sub 2/ fragment were found to be well characterized by temperatures. As was previously observed for the CN fragment of this parent molecule, a distinct decrease in the values of these temperatures is seen to occur during the photolysis laser pulse. This is interpreted as the result of an intensity effect in the later stages of the infrared pumping process. Additional information is also presented on the behavior of the CN radical. Modeling calculations within the framework of the energy-grained master equation support this interpretation.

• Research Organization: Department of Chemistry, Stanford University, Stanford, California 94305
• OSTI ID: 5589397
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 76:5; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ACRYLONITRILE
CHEMICAL REACTIONS
DECOMPOSITION
DISSOCIATION
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ENERGY LEVELS
EXCITED STATES
INFRARED RADIATION
NITRILES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADIATIONS
ROTATIONAL STATES
VIBRATIONAL STATES