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. Author manuscript; available in PMC: 2017 Feb 1.
Published in final edited form as: J Am Soc Mass Spectrom. 2016 Feb;27(2):285–292. doi: 10.1007/s13361-015-1283-y

Figure 1.

Figure 1

Molecular depth profiles of positive and negative water cluster ion peaks at m/z 100, 118, 119 (positive) and 109, 208, 209 (negative) measured for a D2O ice overlayer deposited onto a trehalose film. The signals at m/z 325 (positive) and 341 (negative) correspond to [M−OH]+ and [M−H]− ions of trehalose