Electron trapping in frozen gels γ-irradiated at 77 K

Kroh, J.; Płonka, Andrzej

doi:10.1016/0009-2614(77)80562-9

Cited by 6 publications

(1 citation statement)

References 9 publications

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“…3 The same is true for trapped electrons. They were highly expected 37 but there was complete absence of any color or ESR signal attributable to trapped electrons.…”

Section: Resultsmentioning

confidence: 95%

Hydroperoxyl Radical Generation by γ-Irradiation of Glassy Water at 77 K

et al. 1996

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ESR spectroscopy has been used to identify the paramagnetic species trapped at 77 K upon γ-irradiation of glassy water prepared by hyperquenching of liquid water at cooling rates exceeding 10 5 K/s. Besides OH radicals, which are the only paramagnetic intermediates of water radiolysis stabilized at 77 K in hexagonal ice prepared by slow cooling of liquid water, comparable amounts of HO 2 radicals were found in glassy water. The ESR spectra for trapped OH radicals were typical of such radicals in a glass. Neither trapped electrons nor trapped hydrogen atoms were detected. The contributions of OH and HO 2 radicals to the ESR spectra of glassy water do not depend on irradiation dose in the range 0.8-18 kGy. We stress that HO 2 radicals are not detected in irradiated hexagonal ice under these conditions. They are formed as secondary products after annealing to destroy the OH radicals, but the yields are tiny relative to the remarkably high yields observed in the glassy water. Possible mechanisms for HO 2 radical formation in the early stages of water radiolysis in the glassy state are discussed.

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“…3 The same is true for trapped electrons. They were highly expected 37 but there was complete absence of any color or ESR signal attributable to trapped electrons.…”

Section: Resultsmentioning

confidence: 95%