Production of large molecular ion crystals via sympathetic cooling by laser-cooled Ba+
Production of large molecular ion crystals via sympathetic cooling by laser-cooled Ba+
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通过激光冷却Ba交感冷却生产大分子离子晶体
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
S. Schiller
中科院分区：
文献类型：
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作者：
B. Roth;A. Ostendorf;H. Wenz;S. Schiller
我们在一个线性射频陷阱中用激光冷却138Ba+产生了冷的16O+2、40Ar+、12C16O+2和不同同位素的钡离子(135BA+、136BA+和137BA+)的系综。在含有2000个离子的138Ba+Coulomb大晶体的中心嵌入了交感冷却物种，并通过运动共振激发进行了鉴定。得到了分子分数超过70%的晶体。观察到的多物种晶体结构与分子动力学模拟结果吻合较好。这些模拟还被用来推导出分子离子的平移温度上限，低至20mK。
We have produced ensembles of cold 16O+2, 40Ar+, 12C16O+2, and various isotopes of barium ions (135Ba+, 136Ba+ and 137Ba+) via sympathetic cooling with laser-cooled 138Ba+ in a linear radiofrequency trap. The sympathetically cooled species were embedded in the centre of large 138Ba+ Coulomb crystals containing up to 2000 ions and were identified by motional resonance excitation. Crystals with molecular fractions exceeding 70% were obtained. The observed multi-species crystal structures agree well with results from molecular dynamics simulations. The simulations were also used to deduce an upper limit for the translational temperature of the molecular ions, as low as 20 mK.