Excitation of aromatic hydrocarbons in electron beam irradiated rare gas-hydrocarbon mixtures

Journal Article · Thu Feb 13 04:00:00 EST 1986 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100276a040· OSTI ID:5896723

Denison, L S; Cooper, R; Sauer, Jr, M C

The technique of pulse radiolysis has been used to study the kinetics of formation and decay of emissions in aromatic hydrocarbon/rare gas systems. The mechanism for the formation of the S/sub 1/ levels of anthracene, tetracene, and terphenyl in mixtures of the rare gases Ne, Ar, and Xe has been investigated. The authors have observed that, at low hydrocarbon pressures, the kinetics are adequately described by a sequential two-step process. The formation rate constant shows a linear dependence on hydrocarbon pressure and yields an overall rate constant for formation, in all systems studied, of approximately 1 x 10 /sup 13/ dm/sup 3/ mol/sup -1/ s/sup -1/. These rate constants are too large to be accounted for by atomic collisional energy-transfer process and can only be interpreted in terms of subexcitation electrons being the immediate precursors of the S/sub 1/ levels. The rates of decay were independent of pressure variations and reflected the radiative lifetimes of the S/sub 1/ levels. A smaller effect of bulk rare gas pressure on the formation rate of the S/sub 1/ levels is observed (approx. 10/sup 9/ dm/sup 3/ mol/sup -1/ s/sup -1/) and is attributed to electron cooling by momentum-transfer processes. 10 references, 5 figures, 4 tables.

• Research Organization: Argonne National Lab., IL
• OSTI ID: 5896723
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:4; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
400600 -- Radiation Chemistry
ANTHRACENE
ARGON
AROMATICS
BEAMS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
CONDENSED AROMATICS
DATA
DECOMPOSITION
ELECTRON BEAMS
ELEMENTS
EMISSION SPECTROSCOPY
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
FLUIDS
GASES
HYDROCARBONS
INFORMATION
KINETICS
LEPTON BEAMS
NEON
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
PARTICLE BEAMS
POLYPHENYLS
PRESSURE DEPENDENCE
PULSE TECHNIQUES
QUANTITY RATIO
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIOLYSIS
RARE GASES
REACTION KINETICS
SPECTROSCOPY
TERPHENYLS
TETRACENE
XENON