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Formation of Electrons and of Atomic Hydrogen in γ-irradiated Ice

Naturevolume 199pages689690 (1963) | Download Citation



IN ice at 77° K containing acids such as sulphuric, perchloric and orthophosphoric, irradiated with γ-rays, hydrogen atoms were first detected by electron spin resonance by Livingston, Zeldes and Taylor1. In neutral ice, however, no hydrogen atoms were observed at 77° K although some were detected at 4° K2. It has been suggested3 that radiation-produced electrons, (H2O), which have been shown4 to occur in the radiolysis of aqueous solutions, may react with a hydrogen ion in the acidic ice to produce a (stable) hydrogen atom: In an analogous manner we may expect that a Brønsted acid such as H2PO4 may react to form a hydrogen atom, by a proton transfer, according to the equation: Such reactions have been suggested to occur in aqueous solution5. In the case of bisulphate, one would have the analogous reaction: although there are reasons to suggest that here, as in the other cases, the reaction goes to a greater or lesser extent through an unstable intermediate, namely (HSO4)2, which may break up according to: and possibly also to some extent:

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  1. 1

    Livingston, R., Zeldes, H., and Taylor, E. H., Phys. Rev., 94, 725 (1954); Farad. Soc. Disc., 19, 166 (1955).

  2. 2

    Piette, D. H., Rempel, R. C., Weaver, M. E., and Siegel, S., J. Chem. Phys., 30, 1623 (1959).

  3. 3

    Weiss, J. J., Nature, 186, 751 (1960).

  4. 4

    Hayon, E. M., and Weiss, J. J., Second U.N. Intern. Conf. Peaceful Uses of Atomic Energy, Geneva, 29, 80 (1958).

  5. 5

    Jortner, J., Ottolenghi, M., Rabani, J., and Stein, G., J. Chem. Phys., 37, 2488 (1962).

  6. 6

    Livingston, R., and Weinberger, A. J., J. Chem. Phys., 33, 499 (1960).

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  1. University of Newcastle upon Tyne

    • L. KEVAN
    • , P. N. MOORTHY
    •  & J. J. WEISS


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