Masses of the Stable Chlorine Isotopes

The mass differences between the components of several doublets which involve the stable chlorine isotopes have been measured in a large mass spectrometer operating at a resolving power, at the base of the peaks, of ${10}^5$ or better. These measurements lead to the following values of atomic mass, expressed as mass excesses on the ${\mathrm{C}}^{12}$=12 u scale: ${\mathrm{Cl}}^{37}$=-34 099.73±0.95 μu; ${\mathrm{Cl}}^{35}$=-31 148.62±0.68 μu; ${\mathrm{Cl}}^{37}$-${\mathrm{Cl}}^{35}$=-2951.11±0.59 μu.