Positrons and positronium in macromolecules: Consequences of different charge states

Yoshinori Kobayashi*, Kiminori Sato, Masato Yamawaki*, Koji Michishio, Toshitaka Oka, Masakazu Washio

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Because of their different charge states, positrons and positronium (Ps) behave quite differently in macromolecules. The behavior of positively charged positrons is strongly influenced by electrostatic interactions. In nonpolar macromolecules such as polyethylene, energetic positrons, if not incorporated into Ps, fall into a delocalized state. These positrons are sensitively trapped by polar groups, if any. On the other hand, charge-neutral Ps is localized in a free volume regardless of the macromolecule's chemical structure. In this study, we discuss the behavior and annihilation characteristics of positrons and Ps in various macromolecules, emphasizing their differences.

Original languageEnglish
Article number110590
JournalRadiation Physics and Chemistry
Publication statusPublished - 2023 Jan


  • Free volume
  • Macromolecule
  • Polar group
  • Positron
  • Positronium
  • Trapping

ASJC Scopus subject areas

  • Radiation


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