Abstract
The emission spectra observed by pulse-radiolysis of chloride (MeCl) and alkaline (MeOH) aqueous solutions at temperatures 6–80 K and their time evolution are reported (Me + Li +, Na +, K + or Rb +). It has been found that the luminescence of frozen electrolyte solutions is connected mainly with radiative recombinations of trapped electrons [(e ir −) Me+ and (e vis −) Me+] with OH radicals, Me + cations and H t atoms. The luminescence efficiency as well as position of λ max of the emission spectra is dependent on Me + cations, OH −, Cl − anions and temperature of the matrix. For all aqueous polycrystalline matrices as well as for H 2O frozen ice, the emission band at λ max ≅ 330 nm, which is ascribed to OH ∗ A 2 Σ → X 2 Π transition appears at temperatures below 30 K. The mechanism of luminescence is discussed.
Published Version
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