Positron Annihilation Study of Defects in Succinonitrile

Morten Mostgaard Eldrup, Niels Jørgen Pedersen, J. N. Sherwood

    Research output: Contribution to journalJournal articleResearchpeer-review


    Positron lifetime and angular correlation measurements have been made on the plastic crystal succinonitrile. They confirm the phase transition at 234 ± 1 K. In the plastic phase the average orthopositronium lifetime increases with temperature and saturates at the highest temperatures. This is interpreted as orthopositronium trapping in thermally created defects, probably vacancies. A defect formation energy of 0.36 ± 0.1 eV is deduced. This is lower than predicted values of the vacancy formation energy.
    Original languageEnglish
    JournalPhysical Review Letters
    Issue number19
    Pages (from-to)1407-1410
    Publication statusPublished - 1979


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