Effect of specific energy of heavy ions for 1,2,4,5-tetracyanobenzene radical anion formation

The absorption spectrum of poly(vinyl alcohol) (PVA) film doped with 1,2,4,5-tetracyanobenzene (TCNB) was measured after the irradiation with several hundred MeV of C, Ne and Ar ions. The absorbance due to the TCNB radical anion increased and then decreased with increasing the fluence for all ions....

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Published inRadiation physics and chemistry (Oxford, England : 1993) Vol. 58; no. 2; pp. 123 - 129
Main Authors Taguchi, Mitsumasa, Matsumoto, Yuuichi, Moriyama, Masahiro, Namba, Hideki, Aoki, Yasushi, Hiratsuka, Hiroshi
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.04.2000
Subjects
1,2,4,5-Tetracyanobenzene
Fluence dependence
Ion beam
LET effect
Track structure
Ion beam
Fluence dependence
Track structure
LET effect
1,2,4,5-Tetracyanobenzene
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Summary:The absorption spectrum of poly(vinyl alcohol) (PVA) film doped with 1,2,4,5-tetracyanobenzene (TCNB) was measured after the irradiation with several hundred MeV of C, Ne and Ar ions. The absorbance due to the TCNB radical anion increased and then decreased with increasing the fluence for all ions. The fluence dependence of the absorbance was analyzed by use of the “chemical” track model with a cylindrical structure. As a result, the estimated radius of the chemical track decreases for C and Ne ions with increasing specific energy (ion energy per atomic mass unit). Furthermore, at the same specific energy, the radius increases with increasing ion mass. The formation yield (G-value) of the TCNB radical anion estimated by optical absorbance and ESR measurements was smaller than that by γ-ray irradiation.
ISSN:0969-806X
1879-0895
DOI:10.1016/S0969-806X(99)00368-0