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Mass spectra resulting from EC by [M(H2O)24]2+ for M = Ca (A), Sr (B), Ni (C), and Fe (D). Noise peaks are indicated by asterisks. Peaks corresponding to [SrOH(H2O)12]+ and [SrOH(H2O)13]+ have a 7% contribution from [87Sr(H2O)13]+ and [87Sr(H2O)14]+, respectively.
