40 Ca ~（2+）和40 Ca ~（2+）混合离子晶体中的模式整形
Mode shaping in mixed ion crystals of 40Ca2+ and 40Ca+
摘要：
本文研究了40 Ca ~（2+）和40 Ca ~（2+）离子在线性Paul阱中的混合库仑晶体。用真空紫外激光源将捕获的40 Ca+光电离产生双电荷离子，并通过多普勒冷却的40 Ca+离子进行共振冷却。我们从实验和理论上研究了这些混晶的结构构型和振动模式。我们的结果与40钙2+是一个重要的一步，实验实现的建议，模式成形的线性晶体和自旋相关的配置变化，从锯齿形到线性提出的李等，Phys.Rev.A87，（2013）052304和Phys. Rev. Lett 108，（2012）023003中使用激发到里德堡态的离子。
英文摘要：
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.
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