Angular correlation of annihilation photons in frozen aqueous solutions

M. Milosevic-Kvajic, O. E. Mogensen, G. Kvajic, Morten Mostgaard Eldrup

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Linear‐slit angular correlation curves were obtained at about −140°C for frozen aqueous solutions of HF, HCl, HBr, HI, NH3, FeCl2, FeCl3, NaI, H2SO4, NHO3, MnSO4, KMnO4, K2Cr2O7, NaOH, and LiOH. We found no appreciable influence of a 4% concentration of the last seven impurities. Only halide‐containing impurities strongly changed the form of the curves; ppm concentrations of HCl and HF could be seen. The main change was a broadening of the part of the curve where the narrow and broad components meet. This fact is interpreted as being caused by trapping of para‐positronium in holes in the structure created by the impurities. No evidence of any chemical reactions of positronium and the impurities was found. The annealing of a fast frozen FeCl2 solution was studied. The strongest changes in the curves occurred on annealing from −136 to −100°C.
    Original languageEnglish
    JournalJournal of Chemical Physics
    Volume56
    Issue number6
    Pages (from-to)2567-2571
    ISSN0021-9606
    DOIs
    Publication statusPublished - 1972

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