通过shock-wave抑制的分子束增亮
Molecular beam brightening by shock-wave suppression
摘要：
超声束是冷分子的普遍来源，用于化学反应，原子干涉，气体-表面相互作用，精密光谱学，分子冷却等研究。这种方法的成功来自于相对于其他方法产生的高密度，然而光束密度仍然受到准直表面反射的冲击波的干扰的根本限制。在这里，我们实验表明，这种冲击相互作用可以减少甚至消除的相互作用表面的低温冷却。在最低的表面温度下，测量到光束密度增加了近一个数量级，没有进一步的基本限制。可视化的冲击波等离子体放电和再现与直接模拟Monte Carlo计算都表明，抑制的冲击结构部分是由于降低反射粒子的动量通量，并显着增强的颗粒吸附到表面。我们观察到，与源压力的光束密度的缩放恢复，铺平了道路数量级更明亮的冷分子束。
英文摘要：
Supersonic beams are a prevalent source of cold molecules utilized in the study of chemical reactions, atom interferometry, gas-surface interactions, precision spectroscopy, molecular cooling and more. The triumph of this method emanates from the high densities produced in relation to other methods, however beam density remains fundamentally limited by interference with shock waves reflected from collimating surfaces. Here we show experimentally that this shock interaction can be reduced or even eliminated by cryo-cooling the interacting surface. An increase in beam density of nearly an order of magnitude was measured at the lowest surface temperature, with no further fundamental limitation reached. Visualization of the shock waves by plasma discharge and reproduction with direct simulation Monte Carlo calculations both indicate that the suppression of the shock structure is partially caused by lowering the momentum flux of reflected particles, and significantly enhanced by the adsorption of particles to the surface. We observe that the scaling of beam density with source pressure is recovered, paving the way to order of magnitude brighter cold molecular beams.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
