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Mode shaping in mixed ion crystals of 40Ca2+ and 40Ca+

We present studies of mixed Coulomb crystals of 40Ca+ and 40Ca2+ ions in a linear Paul trap. Doubly charged ions are produced by photoionisation of trapped 40Ca+ with a vacuum ultraviolet laser source and sympathetically cooled via Doppler cooled 40Ca+ ions. We investigate experimentally and theoretically the structural configurations and the vibrational modes of these mixed crystals. Our results with 40Ca2+ are an important step towards experimental realization of the proposals for mode shaping in a linear crystal and spin-dependent configuration changes from zigzag to linear as proposed by Li et al., Phys. Rev. A 87, (2013) 052304 and Phys. Rev. Lett 108, (2012) 023003 using ions excited to Rydberg states.

preprint2013arXivOpen access
T. FeldkerL. PelzerM. StappelP. BachorR. SteinbornD. KolbeJ. WalzF. Schmidt-Kaler
physics.atom-phquant-ph
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T. FeldkerL. PelzerM. StappelP. BachorR. SteinbornD. KolbeJ. WalzF. Schmidt-Kaler

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