Open Access
Fig. 3
Mass spectra in positive (top panels) and negative (bottom panels) ESI modes of residues synthesised after ion bombardment and warm-up of H2O:CH3OH:NH3 frozen mixtures. Panels A and B: 1:1:1 + 29 eV/16 u residue. Panels C and D: 3:1:1 + 67 eV/16 u residue. Panels E and F: 1:1:1+ 98 eV/16 u.
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