Fig. 3
Comparison between IR spectra of pure POM and HMT at 330 K with IR spectra of residue at 330 K obtained after 4 h of VUV irradiation for different initial ice composition (a) H2O:H2CO:NH3 mixture in a 10:3:1 concentration ratio, (b) H2CO:NH3 mixture in a 3:1 concentration ratio, (c) H2O:H2CO:NH3 mixture in a 10:1:3 concentration ratio, (d) H2CO:NH3 mixture in a 1:3 concentration ratio.
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