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arXiv 1104.3901physics.atom-phphysics.flu-dyn
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冷慢分子束

Cold and Slow Molecular Beam

Hsin-I Lu, Julia Rasmussen, Matthew J. Wright, Dave Patterson, John M. Doyle

摘要:

采用两级低温缓冲气室,我们产生了一个冷的,流体动力学提取束的一氢化钙分子与近溢出的速度分布。利用激光光谱学研究了束流动力学、热化和慢化。这种混合的、类似溢出的束源的关键是紧接着流体动力学的、低温源之后放置的“减速单元”[Patterson等人,J. Chem. Phys.,2007,126,154307]。产生的CaH光束在两个制度中创建。一个适度增强的光束具有vf = 65 m/s的前向速度、窄的速度分布和每个脉冲10^9个分子的通量。另一个具有最慢的前进速度vf = 40 m/s,纵向温度为3.6 K,每个脉冲的通量为5x10^8个分子。

英文摘要:

Employing a two-stage cryogenic buffer gas cell, we produce a cold, hydrodynamically extracted beam of calcium monohydride molecules with a near effusive velocity distribution. Beam dynamics, thermalization and slowing are studied using laser spectroscopy. The key to this hybrid, effusive-like beam source is a "slowing cell" placed immediately after a hydrodynamic, cryogenic source [Patterson et al., J. Chem. Phys., 2007, 126, 154307]. The resulting CaH beams are created in two regimes. One modestly boosted beam has a forward velocity of vf = 65 m/s, a narrow velocity spread, and a flux of 10^9 molecules per pulse. The other has the slowest forward velocity of vf = 40 m/s, a longitudinal temperature of 3.6 K, and a flux of 5x10^8 molecules per pulse.

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。

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