UV photodissociation dynamics of the fumaronitrile molecule

Journal Article · Thu Jun 05 00:00:00 EDT 1986 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100403a022· OSTI ID:5629466

Xie, X; McCrary, V R; Jackson, W M

The ultraviolet photodissociation dynamics of C/sub 4/H/sub 2/N/sub 2/ at 193 nm has been studied under both low and high laser fluence conditions. At low laser fluences, LIF studies indicate that CN(X) radicals are produced in the nu'' = 0 and nu'' = 1 vibrational levels, with a Boltzmann-like rotational distribution characterized by a T/sub rot/ of 1330 +/- 10 and 1340 +/- 10 K, respectively. When the laser fluence is increased, emissions from the CN radical in the A/sup 2/II, B/sup 2/..sigma../sup +/, E/sup 2/..sigma.., and F/sup 2/..delta.. states are also seen. These emissions are explained in terms of a sequential absorption mechanism which produces doubly excited C/sub 4/H/sub 2/N/sub 2/. The doubly excited molecule subsequently dissociates to produce vibrationally excited CN(A/sup 2/II) and CN(B/sup 2/..sigma../sup +/) radicals. The E(/sup 2/..sigma..) and F(/sup 2/..delta..) states of the CN are produced by the absorption of a 193-nm photon by CN(A) radicals. The gas-phase room temperature UV absorption spectrum between 190 and 300 nm has also been measured.

• Research Organization: Howard Univ., Washington, DC
• OSTI ID: 5629466
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:12; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
400500* -- Photochemistry
640105 -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CARBONYL RADICALS
CHEMICAL REACTIONS
CHEMISTRY
COSMIC GASES
DATA
DISSOCIATION
ELECTROMAGNETIC RADIATION
ELECTRONIC STRUCTURE
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
FLUIDS
GASES
INFORMATION
NITRILES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOCHEMISTRY
RADIATIONS
RADICALS
REACTION INTERMEDIATES
ULTRAVIOLET RADIATION