Cold neutral atoms via charge exchange from excited state positronium: a proposal
Cold neutral atoms via charge exchange from excited state positronium: a proposal
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DOI：
10.1088/1367-2630/aa6bb8
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发表时间：
2017-05-01
影响因子：
3.3
通讯作者：
Eriksson, S.
中科院分区：
文献类型：
--
作者：
Bertsche, W. A.;Charlton, M.;Eriksson, S.
我们提出了一种通过囚禁离子与里德伯正电子偶素的电荷交换反应产生冷中性原子的方法。高电荷交换反应截面导致离子的有效中和，并且由于正电子素-离子质量比小，中性粒子在该过程中不会获得可观的动能。当原始离子冷却时，反应产生中性粒子，可以用电磁场捕获或进一步操纵。由于可以针对广泛的物种，我们设想，我们的方案可以使实验在低温下，迄今为止一直棘手的，由于缺乏冷却方法。我们提出了一个估计可实现的温度，中性数和密度的实验中，中性形成在毫开尔文温度从直接或同情冷却离子限制在离子芯片上。然后，中性粒子可以被它们的磁矩限制在也形成在芯片上的共同定位的磁性最小阱中。我们讨论了一般的实验要求。
We present a method for generating cold neutral atoms via charge exchange reactions between trapped ions and Rydberg positronium. The high charge exchange reaction cross section leads to efficient neutralisation of the ions and since the positronium-ion mass ratio is small, the neutrals do not gain appreciable kinetic energy in the process. When the original ions are cold the reaction produces neutrals that can be trapped or further manipulated with electromagnetic fields. Because a wide range of species can be targeted we envisage that our scheme may enable experiments at low temperature that have been hitherto intractable due to a lack of cooling methods. We present an estimate for achievable temperatures, neutral number and density in an experiment where the neutrals are formed at a milli-Kelvin temperature from either directly or sympathetically cooled ions confined on an ion chip. The neutrals may then be confined by their magnetic moment in a co-located magnetic minimum well also formed on the chip. We discuss general experimental requirements.