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Fig. 1

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Calibration measurements for LDPI TOF MS of H2O ice. Top panel: LDPI TOF MS plume profiles for different initial H2O ice thickness at 20 K. The intensity is the sum of the m/z = 17 (OH+) and m/z = 18 (H2O+) signals, which are the two major fragment masses upon electron impact ionization of water. Profiles were collected as a function of the delay time between laser desorption and ion extraction. Bottom panel: total signal of the integrated plume profiles from the top panel as a function of initial ice thickness of amorphous H2O ice, collected during two independent calibration measurements. The data were fitted with a linear function (R2 = 0.98).

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