Sub-Kelvin Collision Temperatures in Merged Neutral Beams by Correlation in Phase-Space
Sub-Kelvin Collision Temperatures in Merged Neutral Beams by Correlation in Phase-Space
复制标题
通过相空间相关性计算合并中性束中的亚开尔文碰撞温度
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
E. Narevicius
中科院分区：
文献类型：
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作者：
Yuval Shagam;E. Narevicius
最近的合并中性束实验介绍了测量反应性碰撞在冷态下到10 mK的可能性。在这些实验中达到的最低温度不能用交叉分子束散射的标准形式来解释。这些低的温度变得容易，因为脉冲超声束在自由传播期间在速度-位置空间中发展相关性，使得局部速度标准偏差减小。这种效应导致可获得的碰撞能量减少超过2个数量级沿着同时分辨率提高了一个数量级。我们表明，超音速喷嘴与短脉冲开放持续时间相比的飞行时间，如Even Lavie阀，在实现低碰撞能量与提高分辨率有明显的优势。我们讨论了可能的改进，通过改变检测时间的持续时间的能量分辨率。
Recent merged neutral beam experiments have introduced the possibility of measuring reactive collisions in the cold regime down to 10 mK. The lowest temperature attained in these experiments cannot be explained using the standard formalism developed for crossed molecular beam scattering. These low temperatures become accessible because pulsed supersonic beams develop a correlation in velocity-position space during free propagation such that the local velocity standard deviation decreases. This effect is responsible for a reduction in the attainable collision energy by more than 2 orders of magnitude along with an order of magnitude improvement in the resolution. We show that supersonic nozzles with short pulsed opening durations compared to the time-of-flight, such as the Even-Lavie valve, have a clear advantage in achieving low collision energies with improved resolution. We discuss possible improvements in the energy resolution by varying the detection time duration.
影响因子：
8.6
作者：
S. Willitsch;M. T. Bell;A. Gingell;S. R. Procter;T. Softley
通讯作者：
S. Willitsch;M. T. Bell;A. Gingell;S. R. Procter;T. Softley