用物质波干涉测量法表征可调脉冲原子束
Characterising a tunable, pulsed atomic beam using matter-wave interferometry
摘要：
我们描述了一个速度可调，自旋极化慢亚稳态氩原子束的创建和表征。结果表明，利用物质波干涉法可以测量出束流速度，测量精度在1%以下。干涉图样的轮廓也被用来确定光束的速度扩展，以及亚稳原子和多狭缝氮化硅光栅之间相互作用的范德华系数。范德华系数测定为$C_3$ =1.84 $\pm$ 0.17 μ l，a.u.，这与从光谱数据得到的值非常一致。最后，还测量了加速过程中产生的自旋极化率，表明在m=+2态下，自旋极化率的空间均匀性为96%.
英文摘要：
We describe the creation and characterisation of a velocity tunable, spin-polarized beam of slow metastable argon atoms. We show that beam velocity can be determined with a precision below 1 \% using matter-wave interferometry. The profile of the interference pattern was also used to determine the velocity spread of the beam, as well as Van der Waals co-efficient for the interaction between the metastable atoms and the multi-slit silicon nitride grating. The Van der Waals co-efficient was determined to be $C_3$=1.84$\pm$0.17\,a.u., in good agreement with values derived from spectroscopic data. Finally, the spin polarization of the beam produced during acceleration of the beam was also measured, demonstrating a spatially uniform spin polarization of 96 \% in the m=+2 state.
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