Abstract
We have investigated the luminescence of uranyl nitrate molecules on the surface of powdery SiO2 upon excitation by UV light (PhL) and hydrogen atoms (radical-recombination luminescence (RRL)). It has been found that the PhL and RRL spectra have a clearly defined vibrational structure. The luminescence peaks of the adsorbed UO2 2− ion are characterized by a systematic longwave shift from the same peaks of crystalline uranyl nitrate (by 230–430 cm−1 at 130 K). Moreover, in the adsorption centers the vibration frequencies of UO2 2− are 20–80 cm smaller than in crystalline salt and the RRL bands are 150–350 cm−1 (130 K) wider than the corresponding PhL bands.
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