Fig. 3: Experimental spectra.

a, Measured revolution time spectrum. The nuclei whose masses were measured in this work are shown in red. Nuclides with well-known masses were used as references and are indicated in blue. The nuclides in black were not used as references due to possible isomeric contaminations or large mass uncertainty. b, Scatter plot of the charge-dependent parameter U, which reflects the mean number of secondary electrons released from the foil surface (equation (8)), for ³⁷Cl¹⁷⁺ and ⁶⁶Se³⁴⁺ ions, see the peak at about 635.5 ns in a. The events belonging to each of the ion species can be clearly separated. c, Histogram of calculation with equation (7) involving the mass-to-charge ratios (m/q) of the peaks resolved in b, namely, ³⁷Cl¹⁷⁺ and ⁶⁶Se³⁴⁺ ions.