DOI: 10.1140/epja/i2001-10263-3
Back to the line of stability
Chasing mass accuracies below
using a
Penning trap and highly charged ions
T. Fritioff1, H. Bluhme1, R. Schuch1, I. Bergström2 and M. Björkhage2
1 Atomic Physics, Stockholm University, SCFAB, Fysikum, S-106 91 Stockholm, Sweden
2 Manne Siegbahn Laboratory, Frescativägen 24, S-104 05 Stockholm, Sweden
bergstrom@msi.se
(Received: 21 March 2002 / Published online: 31 October 2002)
Abstract
The Stockholm Penning trap has been connected to an
electron beam ion source named CRYSIS located at the Manne Siegbahn
Laboratory. It is combined to a high-resolution isotope separator that
can provide singly charged mass selected ions of practically any
element. These ions are fed into CRYSIS where it is subject to a very
intense electron beam with an energy of 10-20 keV. The mass of the
neutral atom is obtained by adding the masses of the missing electrons
and subtracting their binding energies. The results on some 16 mass
determinations made at an uncertainty from 3 to 0.3 ppb are commented
on. In these measurements the mass number varies from 1 to 204 and the
ion charges from 1+ to 52+. New mass values are obtained for the
3H,
3He and
4He masses. We have confirmed the Manitoba
measurements of the
Q-value of the double beta-decay of
76Ge and
their mass measurements of the masses of
198Hg and
204Hg
reaching the higher accuracy that traps offer. At present the mass
uncertainty limit is about
which is demonstrated by
comparing our results with the most accurately measured masses by
other groups.
32.10.Bi - Atomic masses, mass spectra, abundances, and isotopes.
21.10.Dr - Binding energies and masses.
07.75.+h - Mass spectrometers.
© Società Italiana di Fisica, Springer-Verlag 2002