Abstract
UV irradiated crystalline H 2O ice emits two broad luminescence bands of low intensity with peaks in the vicinity of 340 and 420 nm. These bands are predominantly excited by light in the vicinity of 220 and 255 nm, respectively. The luminescence and excitation spectra increase in height with irradiation time and exhibit a memory effect when excitation is discontinued and recommenced at a later time. The 420 nm emission band and the 260 nm absorption band are attributed to the A 2∑ + → X 2Π transition of photolytically produced OH radicals which accumulate in the ice lattice and which are excited by the incident UV light.
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