Figure 1

Quadrupole frequency scan of the purification trap. The trap was tuned in this case to have a mass resolving power $R$ of about 30 000, which is enough to separate isobars but not the isomeric states of ${}^{34}\mathrm{Cl}$.Reuse & Permissions

Figure 2

Dipole frequency scan in the precision trap for bunches containing both ${}^{34}\mathrm{Cl}$ and ${}^{34}\mathrm{Cl}$${}^m$. With an excitation time-pattern of 10/20/10 ms (on/off/on) a mass resolving power $R\approx 5\times {10}^5$ was obtained. The two states of ${}^{34}\mathrm{Cl}$ are cleanly separated.Reuse & Permissions

Figure 3

The measurement cycle.Reuse & Permissions

Figure 4

A TOF-ICR curve measured for ${}^{34}\mathrm{Ar}$${}^{+}$ ions. An excitation time pattern of 25/150/25 ms (on/off/on) was used. The black circles (with error bars smaller than the points) are time-of-flight averages for each frequency. The (blue) pixels represent the number of detected ions: the darker the pixel the more ions it represents. The solid (red) line is the fit to the experimental data. Note that the averages include some nonresonant background as well as the resonant ${}^{34}\mathrm{Ar}$${}^{+}$ ions, which accounts for why the averages do not go through the densest concentration of pixels. See Sec. 3b for more details.Reuse & Permissions

Figure 5

A series of cyclotron frequencies obtained for ${}^{34}\mathrm{Ar}$ and ${}^{34}\mathrm{Cl}$ ions (lower panel). Each frequency point includes the results of 30 interleaved scans, obtained with count-rate class analysis. The top panel shows the deviation of the corresponding frequency ratios ${\nu }_d/{\nu }_m$ from the average frequency ratio.Reuse & Permissions

Figure 6

$Q_{\mathrm{EC}}$ values obtained for each set of 30 scans. All the data were analyzed to account for multiple stored ions. In the data denoted by “A” the maximum number of ions per accepted bunch was 5, while those denoted “B” included a maximum of 3. We obtained the final value by taking the unweighted average of “A” and “B” and applying an error bar derived by taking the larger uncertainty of the two and adding the difference between “A” and “B” in quadrature.Reuse & Permissions

Figure 7

Comparison of our $Q_{\mathrm{EC}}$ value measurements, labeled JYFLTRAP, with previous measurements. For each transition, our result is plotted at 0 on the abscissa, and the other results are plotted as differences $(Q_{\mathrm{EC}}^{\mathrm{LIT}.}-Q_{\mathrm{EC}}^{\mathrm{JYFLTRAP}})$. The references from the top down are [25, 26, 28, 29, 30, 32, 33, 34, 35, 36, 37] respectively.Reuse & Permissions