Kjaergaard Niels, Drewsen Michael
Optics and Fluid Dynamics Department, Risø National Laboratory, DK-4000 Roskilde, Denmark.
Phys Rev Lett. 2003 Aug 29;91(9):095002. doi: 10.1103/PhysRevLett.91.095002. Epub 2003 Aug 27.
A structural transition for laser cooled ion Coulomb crystals in a linear Paul trap just above the stability limit of parametrically resonant excitation of bulk plasma modes has been observed. In contrast to the usual spheroidal shell structures present below the stability limit, the ions arrange in a "string-of-disks" configuration. The spheroidal envelopes of the string-of-disks structures are in agreement with results from cold fluid theory usually valid for ion Coulomb crystals if the ion systems are assumed to be rotating collectively.
在一个线性保罗阱中，高于体等离子体模式参量共振激发稳定性极限的激光冷却离子库仑晶体发生了结构转变。与稳定性极限以下通常存在的椭球壳结构不同，离子排列成“盘串”构型。如果假设离子系统集体旋转，盘串结构的椭球包络与通常对离子库仑晶体有效的冷流体理论结果一致。
