Theoretical study of slowing supersonic CH 3 F molecular beams using electrostatic Stark decelerator
Theoretical study of slowing supersonic CH 3 F molecular beams using electrostatic Stark decelerator
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DOI：
10.1088/1674-1056/18/1/023
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发表时间：
2009
影响因子：
1.7
通讯作者：
Lian-Zhong Deng;Guang-Bin Fu;Jian-Ping Yin
中科院分区：
文献类型：
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作者：
Lian-Zhong Deng;Guang-Bin Fu;Jian-Ping Yin
我们用一个简单的解析模型计算了CH3F分子在外电场中的斯塔克效应，不同量子态下超音速CH3F分子的转动布居，并分析了弱场寻觅CH3F分子在斯塔克减速器电场中|J=1，Km=−1>的运动。对分子通过减速器的动态慢化过程进行了三维蒙特卡罗模拟，并与解析模型的结果进行了比较，包括慢化分子包的相稳定性、慢化效率以及平移温度。我们的研究表明，处于|J=1，Km=−1>态的CH3F分子具有适度的偶极矩(~1.85德拜)和相对较小的分子质量(~34.03)，是一个很好的静电场慢化候选分子。在减速器上施加±10kV的高压，可以使370m/S的分子在200个慢化级内停止。
We have calculated the Stark effect of CH3F molecules in external electrical fields, the rotational population of supersonic CH3F molecules in different quantum states, and analyse the motion of weak-field-seeking CH3F molecules in a state | J = 1, KM = −1〉 inside the electrical field of a Stark decelerator by using a simple analytical model. Three-dimensional Monte Carlo simulation is performed to simulate the dynamical slowing process of molecules through the decelerator, and the results are compared with those obtained from the analytical model, including the phase stability, slowing efficiency as well as the translational temperature of the slowed molecular packet. Our study shows that with a modest dipole moment (~1.85 Debye) and a relatively slight molecular weight (~34.03), CH3F molecules in a state |J = 1, KM = −1〉 are a good candidate for slowing with electrostatic field. With high voltages of ±10 kV applied on the decelerator, molecules of 370 m/s can be brought to a standstill within 200 slowing stages.