Electrostatic extraction of cold molecules from a cryogenic reservoir.
Electrostatic extraction of cold molecules from a cryogenic reservoir.
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DOI：
10.1103/physrevlett.102.033001
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发表时间：
2008-06
影响因子：
8.6
通讯作者：
L. D. van Buuren;C. Sommer;M. Motsch;S. Pohle;M. Schenk;J. Bayerl;P. Pinkse;G. Rempe
中科院分区：
文献类型：
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作者：
L. D. van Buuren;C. Sommer;M. Motsch;S. Pohle;M. Schenk;J. Bayerl;P. Pinkse;G. Rempe
我们提出了一种方法，它提供了一种连续的、高密度的慢速和内部冷的极性分子的光束。在我们的源中，热分子首先通过与低温氦缓冲气体的碰撞而冷却。然后，通过静电四极导向器提取冷分子。对于Nd3，源产生的通量高达(7+/-4(7))×10(10)分子/S，峰值密度高达(1.0+/-0.6(1.0))×10(9)分子/厘米~3。对于H_2CO，用耗尽光谱监测了振荡态的布居，得到了高达(82+/-10)%的单态布居。
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 ND3 the source produces fluxes up to (7+/- 4(7)) x 10(10) molecules/s with peak densities up to (1.0+/- 0.6(1.0)) x 10(9) molecules/cm3. For H2CO the population of rovibrational states is monitored by depletion spectroscopy, resulting in single-state populations up to (82+/-10)%.