Diffusion and localization of o-Ps in D2O determined from positron annihilation in SDS micellar solutions

Sz Vass, Zs Kajcsos, B. Molnár

Research output: Contribution to journalArticle

6 Citations (Scopus)


A microscopic diffusion model is presented for the determination of orthopositronium (o-Ps) lifetime in micellar solutions. Among other parameters, the lifetime density function depends on the o-Ps diffusion coefficient in the water phase. Orthopositronium diffusion coefficients are determined by fitting this lifetime density function to positron annihilation spectra obtained from 1 mol/dm3 solution of sodium dodecylsulphate (SDS) in D2O at different temperatures. The activation energy of the o-Ps diffusion in D2O obtained from an Arrhenius plot as Ea = 0.922 ± 0.103 eV indicates strong localization.

Original languageEnglish
Pages (from-to)105-109
Number of pages5
JournalChemical Physics Letters
Issue number1
Publication statusPublished - Jul 12 1985

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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