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Fig. 6

image

QMS signals of CH3OH ice (top) and CD3OD ice (bottom) during the UV-irradiation, monitored with fragments of m/z 31 and 34, respectively. The color code indicates the different irradiation temperatures. The curves have been offset for clarity, since their signals were all at the same level except for the 130 K experiments. The gray areas represent UV-irradiation, when the lamp is turned on.

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