Quenching of C/sub 2/H emission produced by vacuum ultraviolet photolysis of acetylene

Journal Article · Thu Sep 15 04:00:00 EDT 1988 · J. Chem. Phys.; (United States)

OSTI ID:6926007

Sander, R K; Tiee, J J; Quick, C R; Romero, R J; Estler, R

Excited C/sub 2/ H* is produced by vacuum ultraviolet photolysis of acetylene using a frequency tripled laser. Time-dependent emission is measured from 400--940 nm. The use of a coherent photolysis source produces an excitation spectrum in which the rotational band contour is resolved. The absorption spectrum of C/sub 2/ H/sub 2/ taken in the same apparatus closely resembles the excitation spectrum indicating a homogeneous predissociation. Time-dependent quenching of the C/sub 2/ H* emission by Xe, Kr, Ar, He, N/sub 2/, H/sub 2/, D/sub 2/, and C/sub 2/ H/sub 2/ is measured. The rapid quenching rates and lack of strong dependence on atomic weight suggest a spin-allowed process is involved in this channel of C/sub 2/ H/sub 2/ photolysis. Quench rates are compared with several theoretical models.

• Research Organization: Chemical and Laser Sciences Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
• OSTI ID: 6926007
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 89:6; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ACETYLENE
ALKYNES
ARGON
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
BREMSSTRAHLUNG
CHEMICAL REACTIONS
COLLISIONS
DECOMPOSITION
DEUTERIUM
ELECTROMAGNETIC RADIATION
ELEMENTS
EMISSION SPECTRA
FLUIDS
GASES
HELIUM
HYDROCARBONS
HYDROGEN
HYDROGEN ISOTOPES
ISOTOPES
KRYPTON
LIGHT NUCLEI
MOLECULE COLLISIONS
MOLECULE-MOLECULE COLLISIONS
NITROGEN
NONMETALS
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
QUENCHING
RADIATIONS
RADICALS
RARE GASES
REACTION INTERMEDIATES
SPECTRA
STABLE ISOTOPES
SYNCHROTRON RADIATION
TIME DEPENDENCE
XENON