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Precision measurement of the atomic mass of 6Li using a Penning ion trap mass spectrometer

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3 Author(s)
Heavner, T.P. ; Joint Inst. for Lab. Astrophys., Colorado Univ., Boulder, CO, USA ; Jefferts, S.R. ; Dunn, G.H.

We have used a cryogenic (4 K) Penning ion trap mass spectrometer to measure the mass ratios of 6Li+/12C 2+, 6Li+/D3+, and D2+/He+. We developed techniques to create ions outside of the cryogenic trap environment and to transport them into the trap where a small number (1-10) were confined. The ions' frequencies of oscillation were measured using a high-Q tuned circuit to detect image currents induced in the trap electrodes. The measurements involving 6Li+ result in a value for the atomic mass of 6Li of 6.015 122 795(16) u, with a fractional uncertainty of ±2.7×10-9 representing a factor of 30 improvement over the published, tabulated value. A measurement of the D2+/He+ mass ratio has an uncertainty of ±1.1×10-9 and is within 0.6×10-9 of the tabulated value, thus demonstrating that our techniques are reliable

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Instrumentation and Measurement, IEEE Transactions on  (Volume:48 ,  Issue: 2 )