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. Author manuscript; available in PMC: 2007 Oct 17.

Published in final edited form as: J Am Soc Mass Spectrom. 2007 Apr 15;18(7):1217–1231. doi: 10.1016/j.jasms.2007.03.033

Mass spectra from a) ESI of a 2 mM aqueous CaCl₂ showing a broad distribution of $Ca {(H_{2} O)}_{n}^{2 +}$ clusters (selected n are labeled); b) SWIFT isolation of $Ca {(H_{2} O)}_{24}^{2 +}$ and c) ECD of $Ca {(H_{2} O)}_{24}^{2 +}$ with product ions indicated in the spectrum. A noise peak at ~297 m/z is labeled with an asterisk.