Perreault William E, Zhou Haowen, Mukherjee Nandini, Zare Richard N
Department of Chemistry, Stanford University, Stanford, California 94305, USA.
J Chem Phys. 2022 Oct 14;157(14):144301. doi: 10.1063/5.0114349.
To accurately map weak D-Ne long-range interactions, we have studied rotationally inelastic cold scattering of D prepared in the vibrationally excited (v = 4) and rotationally aligned (j = 2, m) quantum state within the moving frame of a supersonically expanded mixed molecular beam. In contrast to earlier high energy D-Ne collision experiments, the (j = 2 → j' = 0) cold scattering produced highly symmetric angular distributions that strongly suggest a resonant quasi-bound collision complex that lives long enough to make a few rotations. Our partial wave analysis indicates that the scattering dynamics is dominated by a single resonant l = 2 orbital, even in the presence of a broad temperature (0-5 K) distribution that allows incoming orbitals up to l = 5. The dominance of a single orbital suggests that the resonant complex stabilizes through the coupling of the internal (j = 2) and orbital (l = 2) angular momentum to produce a total angular momentum of J = 0 for the D-Ne complex.
为了精确绘制弱D-Ne长程相互作用，我们在超声速膨胀混合分子束的移动框架内，研究了处于振动激发（v = 4）和旋转取向（j = 2，m）量子态的D的旋转非弹性冷散射。与早期的高能D-Ne碰撞实验不同，（j = 2 → j' = 0）冷散射产生了高度对称的角分布，这强烈表明存在一个共振准束缚碰撞复合体，其寿命足够长，可以进行几次旋转。我们的分波分析表明，即使存在宽温度（0 - 5 K）分布，允许入射轨道高达l = 5，散射动力学仍由单个共振l = 2轨道主导。单个轨道的主导地位表明，共振复合体通过内部（j = 2）和轨道（l = 2）角动量的耦合而稳定，从而使D-Ne复合体的总角动量为J = 0。
