Abstract
Abstract Structural effects in the radioluminescence spectra of glassy and polycrystalline aqueous solutions of chloride and alkaline ices observed by pulse radiolysis at temperatures 6–110 K are reported. The luminescence efficiency as well as position of λ max of the emission spectra are dependent on the physical state and temperature of the matrix. For all the investigated aqueous polycrystalline matrices and for H 2 O ice, the emission band peaking at about 330 nm, assigned to OH∗A 2 Σ →X 2 Π transition appears at temperatures below 40 K. This UV band was not observed for glassy matrices. Luminescence bands observable in the visible range of spectrum (400–600 nm) can be associated with the emission of (OH − )∗, the radiative capture of trapped electrons e − t by metal cations Me + (Me 2+ ) and trapped atoms H t . For polycrystalline chloride matrices a contribution of the emission of (Cl 2− 2 )∗ must be taken into account.
Published Version
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