Picosecond pulse radiolysis studies on excitation processes in liquid cyclohexane

Journal Article · Thu Apr 17 00:00:00 EST 1980 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100445a007· OSTI ID:5183447

Katsumura, Y; Tagawa, S; Tabata, Y

The behavior of the scintillation emission from 2,5-diphenyloxazole in liquid cyclohexane was investigated by use of the picosecond (approx. 10 ps) electron pulse. The emission was detected by a streak camera with picosecond time resolution. The emission was attributable to the fluorescence from excited 2,5-diphenyloxazole. From the effect of additives such as CCl/sub 4/ and triethylamine, we found that the formation of excited 2,5-diphenyloxazole is composed of faster and slower processes. The slower process is quenched significantly by CCl/sub 4/ and triethylamine and this process is considered to be mainly due to the energy transfer from excited cyclohexane molecules to 2,5-diphenyloxazole. The rate constant for the energy transfer is approx. 4 x 10/sup 11/ M/sup -1/ s/sup -1/. It was also found that the lifetime of the excited singlet state of cyclohexane is about 300 ps. On the other hand, in the faster process, the growth of emission is completed within a pulse duration and this emission is also affected by quenchers. For the faster process, the formation of excited 2,5-diphenyloxazole will be discussed in connection with the direct excitation by subexcitation electrons, rapid recombination of solute ions, and direct excitation by Cerenkov light.

• Research Organization: Univ. of Tokyo, Ibaraki, Japan
• OSTI ID: 5183447
• Journal Information: J. Phys. Chem.; (United States), Vol. 84:8
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
OXAZOLES
CHEMICAL RADIATION EFFECTS
RADIOLUMINESCENCE
CYCLOHEXANE
ELECTRONS
EXPERIMENTAL DATA
ISOLATED VALUES
ALKANES
AZOLES
CHEMISTRY
CYCLOALKANES
DATA
DATA FORMS
ELEMENTARY PARTICLES
FERMIONS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
INFORMATION
LEPTONS
LUMINESCENCE
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
RADIATION CHEMISTRY
RADIATION EFFECTS
400600* - Radiation Chemistry