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. Author manuscript; available in PMC: 2009 Jun 1.
Published in final edited form as: J Am Soc Mass Spectrom. 2008 Mar 5;19(6):772–779. doi: 10.1016/j.jasms.2008.02.010

Figure 2.

Figure 2

[Ca(H2O)15]2+ precursor abundance after 120 ms of electron irradiation as a function of heated cathode potential, measured with two different trapping plate potential conditions: a symmetric 2.0 V trap potential during electron irradiation and ion detection (solid squares); and asymmetrical 8.3/9.2 V source-side/far-side trap potentials during electron irradiation, 2.0 V during ion detection (open circles).