Fig. 6
Left: CH3COOCH3 ice-film experiment. Right, top panel: ice column density measurements from IR spectra. Middle panel: QMS-scaled intensities at selected masses we used to follow carbon dioxide (m = 44), methyl acetate (m = 74, 59, 43, 29, 15), and CO (m = 28) during irradiation. Lower panel: QMS signal ratios of the m = 43 (CH3CO) and m = 59 (CH3COO) biggest fragments to the m = 74 (ionised CH3COOCH3) are shown as a function of irradiation (full lines). The ratios stay reasonably constant, with a value close to the pre-irradiation value (dotted lines). See text for details.
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