Recent Progress with the SMILETRAP Penning Mass Spectrometer |
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Authors: | Tomas Fritioff Conny Carlberg Guilhem Douysset Reinhold Schuch Ingmar Bergström |
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Institution: | 1. Atomic Physics, Stockholm University, Frescativ?gen 24, S-10405, Stockholm, Sweden 2. Atomic Physics, Stockholm University, Frescativ?gen 24, S-10405, Stockholm, Sweden 3. Manne Siegbahn Laboratory (MSL), Stockholm University, Frescativ?gen 24, S-10405, Stockholm, Sweden
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Abstract: | The Penning trap mass spectrometer SMILETRAP has been considerably improved during the last two years. The helium pressure
has been carefully stabilized and is now independent of irregular air pressure. The temperature of the hyperboloidal precision
trap is stabilized to ±0.03°C. Remaining temperature instabilities are compensated by changes in the current of a warm coil
surrounding the precision trap. The frequency synthesizer is now locked to GPS. This means that it is much easier to accurately
measure resonances during several days. The improvements have demonstrated that in mass doublet measurements with an excitation
time of 1 s it is possible to determine the mass of ions with q/A=1/2 at an uncertainty to a few times of 0.1 ppb, using selected rather than cooled ions. In routine measurements lasting
for one day it is possible to reach a mass uncertainty of 1 ppb. The masses of the following particles and atoms have been
measured with uncertainties in the region 0.3–2 ppb: p, 3H, 3He, 4He, 22Ne, 28Si, 36Ar, 76Ge, 76Se, 86Kr and 133Cs. It has also been shown that though we are using a warm bore the trap pressure is sufficiently low to prevent electron
capture from the rest gas for excitation times of 3 s and for ion charges as high as 50+.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | Penning trap EBIS produced ions precision mass measurements |
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