Radiation damage studies by x-ray photoelectron spectroscopy. III. Electron irradiated halates and perhalates

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Abstract
X‐ray photoelectron spectroscopy (XPS) was employed to identify radiolytic products in NaClO3, LiClO3, LiBrO3, and LiIO4 which were irradiated in situ with 1.4 keV electrons. While LiIO4 was exceedingly resistant to radiation damage, the remaining compounds decomposed readily by an apparent stepwise release of oxygen from the parent oxyanion to form XO−3, XO−2, X− (X=Cl or Br) and O2. Heavy irradiation produced IO−3 in LiIO4 and alkali halide, and alkali‐metal oxide in the remaining compounds. These final products were cathodochromic, with both trapped electron (F or anion vacancy) and hole (Vk or X−2) centers being formed. Photobleaching of these centers also induced a partial reoxidation of the halogen species that had been formed by radiation‐induced reduction. Comparison of the production rate of Li2O with that of X−2+X− suggests that Li2O is not a primary product,but may be produced via oxidation of colloidal particles of metallic lithium in the alkali halide layer of the heavily irradiated samples.

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