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

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