MECHANISM OF POSITRONIUM FORMATION IN MIXTURES OF FLUORINATED BENZENES AND n-HEXANE.

Zhicheng Zhang, Yasuo Ito, Masakazu Washio, Yoneho Tabata

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Positronium yield (I//3) in binary mixtures of benzene derivatives (p-difluorobenzene, 1,2,4,5-tetrafluorobenzene, pentafluorobenzene, perfluorobenzene and p-xylene) in n-hexane has been measured. As additives all of the aromatic compounds have been found to enhance Ps yield in n-hexane, but the effect was unexpectedly smaller for 1,2,4,5-C//6H//2F//4. It is proposed that there are at least three processes which lead to the enhancement: anti-recombination by scavenging excess electrons, anti-recombination by scavenging positive holes, and electron abstraction from excited molecular states. Addition of a small amount of n-hexane in the fluorinated benzenes resulted in a decrease in the Ps yield to a different degree which strongly depended on the number of fluorine atoms substituted. Discussion is made on the Ps formation mechanism taking into account possible role of excited molecular states.

Original languageEnglish
Pages (from-to)47-50
Number of pages4
JournalRadiation Physics and Chemistry
Volume30
Issue number1
Publication statusPublished - 1987 Dec 1
Externally publishedYes

ASJC Scopus subject areas

  • Radiation

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