Masses of stable xenon isotopes: Check for internal consistency via ion cyclotron resonance mass spectrometry

A Fourier transform ion cyclotron resonance (ICR) mass spectrometer has been used to measure the relative masses of five of the stable isotopes of xenon. The precision of these measurements is comparable to that of the reference mass values (Atomic Mass Table). When the measured ICR frequencies are used to check the mass table values of ${}_{}{}^{129}{}_{}{}^{}\mathrm{Xe}$ through ${}_{}{}^{136}{}_{}{}^{}\mathrm{Xe}$ for internal consistency, a significant error in the mass of ${}_{}{}^{134}{}_{}{}^{}\mathrm{Xe}$ is indicated.