Pulse radiolysis studies on liquid alkanes and related polymers

S. Tagawa, N. Hayashi, Y. Yoshida, Masakazu Washio, Y. Tabata

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Absorption spectra of alkane radical cations, alkane excited states, and alkyl radicals and electrons in irradiated neat liquid alkanes at room temperature were assigned on subnanosecond and nanosecond time scale after an electron pulse. Two broad visible and near-infrared absorption bands of alkane excited states and radical cations, and UV absorption band of alkyl radicals were observed in neat n-alkanes. In neat cyclohexane and trans-decalin, very broad visible absorption band mainly due to alkane excited states and UV absorption band of alkyl radicals were observed. In neat neopentane and isooctane, visible absorption bands were not observed, although UV absorption bands of alkyl radicals were observed. The wavelengths of absorptive peaks of alkane radical cations and excited states become longer with increasing the number of carbon atoms of n-alkanes. The lifetimes of alkane radical cations become shorter with decreasing the number of carbon atoms of n-alkanes and are shorter than those of electrons in neat alkanes. The main processes of the alkyl radical formation finish within the time resolution of our system (about 20 ps). The alkyl radicals are produced mainly from excited radicals cations and partly from higher excited states, the lowest excited states, radical cations, and thermal hydrogen atoms. In irradiated ethylene-propylene copolymers, broad absorption bands of excited states and tail parts of absorption bands of radical cations and electrons were observed in visible and near-infrared region, although UV absorption of alkyl radicals was not confirmed lack of transparency of polymer films.

Original languageEnglish
Pages (from-to)503-511
Number of pages9
JournalInternational Journal of Radiation Applications and Instrumentation. Part
Volume34
Issue number4
DOIs
Publication statusPublished - 1989
Externally publishedYes

Fingerprint

radiolysis
alkanes
polymers
liquids
pulses
absorption spectra
cations
excitation
electrons
neopentane
carbon
propylene
cyclohexane
infrared absorption
atoms
hydrogen atoms
copolymers
ethylene

Cite this

Pulse radiolysis studies on liquid alkanes and related polymers. / Tagawa, S.; Hayashi, N.; Yoshida, Y.; Washio, Masakazu; Tabata, Y.

In: International Journal of Radiation Applications and Instrumentation. Part, Vol. 34, No. 4, 1989, p. 503-511.

Research output: Contribution to journalArticle

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