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PI-ReTOF-MS data during the TPD phase of isotopically substituted methanol (CH3OH) and oxygen (O2) ice mixtures photo ionized at a photon energy of 10.86 eV. (A) CH3OH + O2, m/z = 48; (B) 13CH3OH + O2, m/z = 49; (C) CD3OD + O2, m/z = 52; and (D) CH318OH + 18O2, m/z = 52. The inset shows the expanded view between 160 K and 200 K.
