Construction of new research field on multi-dimensional stereodynamics in the ultracold radical-radical reaction

我们研制了一种新型的减速器，它是由200组非对称空间调制磁场组成的。为了检验所设计减速器的性能，我们研究了减速器对亚稳态He（3S）的作用。He（3S）通过速度调制器后的速度分布分为三个分量，分别对应于三个不同的磁量子数（M）态。结果表明，我们成功地实现了顺磁粒子的态选择，即根据量子态的不同，对顺磁粒子的速度进行减速和加速。

We produced a new type of velocity decelerator which is constructed with 200sets of asymmetrically spatial modulated magnetic fields by using neodymium magnets. For the performance examination of the designed decelerator, we studied the action of the velocity decelerator on the metastable He(3S). The velocity distribution of He(3S) after passing the velocity modulator separates into three components, which correspond to the three different magnetic quantum number(M) states. It is verified that we succeeded in the state selection of the paramagnetic species by deceleration and acceleration of the velocity depending on the quantum state.