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TUZAUD02 |
Coulomb Crystallization of Highly Charged Ions | |
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Funding: MPIK, QUEST at PTB, DFG Electronic and nuclear wave functions significantly overlap for inner-shell electrons. Their quantum state is strongly influenced by the resulting enhancement of relativistic, QED and nuclear size effects. In highly charged ions (HCIs), the relative reduction of electronic correlations contributions improves the visibility of the underlying physics phenomena. These facts have driven research efforts with HCIs, yet the typically high temperatures (MK) at which they are produced and trapped in the laboratory constitute a hindrance for application of laser spectroscopic methods. To overcome this, we have interfaced an electron beam ion trap source for HCIs with a cryogenic linear Paul trap (*) that can also store laser-cooled Be+ Coulomb crystals. Those are used for sympathetic stopping and cooling of the incoming precooled and decelerated HCI bunches, inducing the formation of stable mixed-species crystals (**). The strongly suppressed thermal motion (mK scale) of the co-crystallized HCIs offers novel possibilities for investigation of questions regarding the time variation of fundamental constants (***), parity non-conservation effects, and quantum electrodynamics. * M. Schwarz. et al., Rev. Sci. Instr. 83, 083115 (2012) ** L. Schmöger et al., Science 347, 1233-1236 (2015) *** J. C. Berengut et al., Phys. Rev. Lett. 106, 210802 (2011) |
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