Determination of the helium-4 mass in a Penning trap
Institut für Physik, Universität Mainz, 55099 Mainz, Germany
Published online: 15 August 2001
We have measured the cyclotron frequencies of He+, H+_2 and D+_2 ions in a room temperature Penning trap. The resonances were detected destructively by a time-of-flight technique. The statistical uncertainty of the resonance frequencies was generally below 1 ppb. A detailed account of measures to minimize systematic frequency shift is presented. Using the accepted values for the proton and deuteron mass we obtain a value for the 4He mass: (0.5 ppb). It is in agreement with the accepted value.
PACS: 27.10.+h – / 32.10.Bi – Atomic masses, mass spectra, abundances, and isotopes / 07.75.+h – Mass spectrometers
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2001