从低温容器中静电提取冷分子
Electrostatic extraction of cold molecules from a cryogenic reservoir
摘要：
我们提出了一种方法，它提供了一个连续的，高密度的光束缓慢和内部冷的极性分子。在我们的源中，温暖的分子首先通过与低温氦缓冲气体的碰撞而冷却。然后通过静电四极杆引导提取冷分子。对于ND $_3$，源产生高达$(7 \pm ^{7}_{4}) \times 10^{10}$分子/秒的通量，峰值密度高达$(1.0 \pm ^{1.0}_{0.6}) \times 10^9$分子/cm $^3$。对于H $_2$ CO，通过耗尽光谱来监测振转态的布居，从而产生高达$(82 \pm 10)%$的单态布居。
英文摘要：
We present a method which delivers a continuous, high-density beam of slow and internally cold polar molecules. In our source, warm molecules are first cooled by collisions with a cryogenic helium buffer gas. Cold molecules are then extracted by means of an electrostatic quadrupole guide. For ND$_3$ the source produces fluxes up to $(7 \pm ^{7}_{4}) \times 10^{10}$ molecules/s with peak densities up to $(1.0 \pm ^{1.0}_{0.6}) \times 10^9$ molecules/cm$^3$. For H$_2$CO the population of rovibrational states is monitored by depletion spectroscopy, resulting in single-state populations up to $(82 \pm 10)%$.
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