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Sensors 2010, 10(3), 2169-2187; doi:10.3390/s100302169

Trapped Ion Oscillation Frequencies as Sensors for Spectroscopy

1,* , 2
1 Department of Physics, Imperial College London, SW7 2AZ, London, UK 2 GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany 3 Nuclear Chemistry Department, Johannes-Gutenberg-Universität, D-55099 Mainz, Germany
* Author to whom correspondence should be addressed.
Received: 18 January 2010 / Revised: 2 March 2010 / Accepted: 10 March 2010 / Published: 16 March 2010
(This article belongs to the Special Issue Laser Spectroscopy and Sensing)
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The oscillation frequencies of charged particles in a Penning trap can serve as sensors for spectroscopy when additional field components are introduced to the magnetic and electric fields used for confinement. The presence of so-called “magnetic bottles” and specific electric anharmonicities creates calculable energy-dependences of the oscillation frequencies in the radiofrequency domain which may be used to detect the absorption or emission of photons both in the microwave and optical frequency domains. The precise electronic measurement of these oscillation frequencies therefore represents an optical sensor for spectroscopy. We discuss possible applications for precision laser and microwave spectroscopy and their role in the determination of magnetic moments and excited state lifetimes. Also, the trap-assisted measurement of radiative nuclear de-excitations in the X-ray domain is discussed. This way, the different applications range over more than 12 orders of magnitude in the detectable photon energies, from below μeV in the microwave domain to beyond MeV in the X-ray domain.
Keywords: penning trap; magnetic bottle; spectroscopy; magnetic moment penning trap; magnetic bottle; spectroscopy; magnetic moment
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Vogel, M.; Quint, W.; Nörtershäuser, W. Trapped Ion Oscillation Frequencies as Sensors for Spectroscopy. Sensors 2010, 10, 2169-2187.

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