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Fig. 6
Mass spectrum of ~13.5 nm-thick methanol ice (CH3OH and 13CH3OH) deposited at 20 K, using 70 eV electrons as an ionisation source, irradiated for 64 min and corresponding fluence: (1.2 ± 0.4) × 1017 photons cm-2. The inset depicts the correlation of the peak intensities between the two experiments,i.e. 12CHy vs. 13CHy.
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