A supersonic beam of cold lithium hydride molecules.
A supersonic beam of cold lithium hydride molecules.
复制标题
冷氢化锂分子的超音速束。
DOI：
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发表时间：
2006
影响因子：
4.4
通讯作者：
M. Tarbutt
中科院分区：
文献类型：
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作者：
S. Tokunaga;J. Stack;J. Hudson;B. Sauer;E. Hinds;M. Tarbutt
我们已经开发了一个冷LiH分子的斯塔克减速和捕获实验的来源。锂金属从固体靶烧蚀到超音速膨胀的载气中。平动、转动和振动温度分别为0.9+/-0.1，5.9 +/-0.5和468+/-17 K。虽然它们还没有与载气达到热平衡，但我们估计90%的LiH分子处于基态，X（1）Sigma（+）（v=0，J=0）。对于一个7 ns的烧蚀脉冲，基态的分子数量为4.5+/-1.8 x 10（7）molecules/sr。第二个延迟的烧蚀脉冲在同一气体脉冲的不同部分产生另一个LiH光束，从而几乎使信号加倍。持续150微秒的长脉冲可以使光束强度增加15倍。
We have developed a source of cold LiH molecules for Stark deceleration and trapping experiments. Lithium metal is ablated from a solid target into a supersonically expanding carrier gas. The translational, rotational, and vibrational temperatures are 0.9+/-0.1, 5.9+/-0.5, and 468+/-17 K, respectively. Although they have not reached thermal equilibrium with the carrier gas, we estimate that 90% of the LiH molecules are in the ground state, X (1)Sigma(+)(v=0,J=0). With a single 7 ns ablation pulse, the number of molecules in the ground state is 4.5+/-1.8 x 10(7) molecules/sr. A second, delayed, ablation pulse produces another LiH beam in a different part of the same gas pulse, thereby almost doubling the signal. A long pulse, lasting 150 micros, can make the beam up to 15 times more intense.