Fig. 3
VUV (120−240 nm) spectra of pure H2O ices deposited at 20 K before and after (solid black and red lines, respectively) 1 keV electron irradiation with a maximum total fluence of 2.2 × 1017 e− cm−2. A VUV photoabsorption spectrum of the processed ice heated to 140 K is also shown for comparison (solid green line). All VUV spectra are acquired with a step size of 1 nm.
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