The Vacancy Formation Energy in Crystalline Adamantane Determined by Positron Annihilation Techniques

D. Lightbody, J. N. Sherwood, Morten Mostgaard Eldrup

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The injection of positrons into crystalline adamantane results in the formation of positronium (Ps). At temperatures T> 400 K the mean lifetime of the long-lived ortho-positronium exhibits a sigmoidal increase with temperature characteristic of the trapping of this species in thermally created defects. The variation is well described by the trapping model usually applied to the trapping of positrons in defects in metals. The formation energy of the defects which trap ortho-Ps is estimated at Efv = 70 ± 10 kJ mol-1 (0.73 ± 0.1 eV). This value is in good agreement with estimates of the formation energy of lattice vacancies in adamantane derived from self-diffusion studies.
    Original languageEnglish
    JournalChemical Physics Letters
    Volume70
    Issue number3
    Pages (from-to)487-491
    ISSN0009-2614
    DOIs
    Publication statusPublished - 1980

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