通过D（v = 2，j = 2）+ He → D（v = 2，j = 0）+ He冷散射中的角分布确定的形状共振。

Shape resonance determined from angular distribution in D (v = 2, j = 2) + He → D (v = 2, j = 0) + He cold scattering.

作者信息

Zhou Haowen, Perreault William E, Mukherjee Nandini, Zare Richard N

机构信息

Department of Chemistry, Stanford University, Stanford, California 94305, USA.

出版信息

J Chem Phys. 2021 Mar 14;154(10):104309. doi: 10.1063/5.0045087.

DOI:10.1063/5.0045087

PMID:33722006

Abstract

We find an l = 2 shape resonance fingerprinted in the angular distribution of the cold (∼1 K) Δj = 2 rotationally inelastic collision of D with He in a single supersonic expansion. The Stark-induced adiabatic Raman passage is used to prepare D in the (v = 2, j = 2) rovibrational level with control of the spatial distribution of the bond axis of the molecule by magnetic sublevel selection. We show that the rate of Δj = 2 D-D relaxation is nearly two orders of magnitude weaker than that of D-He. This suggests that the strong D-He scattering is caused by an orbiting resonance that is highly sensitive to the shape of the long-range potential.

摘要

我们在单次超声速膨胀中，发现了冷（约1 K）的D与He发生Δj = 2转动非弹性碰撞的角分布中存在l = 2形状共振的指纹特征。利用斯塔克诱导绝热拉曼通道，通过磁子能级选择来控制分子键轴的空间分布，从而将D制备到（v = 2，j = 2）振转能级。我们表明，Δj = 2的D-D弛豫速率比D-He的弛豫速率弱近两个数量级。这表明，强D-He散射是由对长程势形状高度敏感的轨道共振引起的。