Mass spectra of Cs, Ba and the rare elements of the spiked standard rock sample JR-2 (Spike isotopes: 136 Ba, 143 Nd, 147SM, 151 Eu, 16 1Dy, 171Yb). Each data point represents a measurement of 1 nC total ion charge. The inset shows a highly resolved mass spectrum (M/dM = 3.000) at mass number 132 for the BCR-1 standard.

(Courtesy of K.P.Jochum, H.M.Seufert, A.W.Hofmann (MaxPlanck-Institut für Chemie) and H.-J. Laue (spectromat Massenspektrometer GmbH, Bremen))

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