Departamento de Química Física. Universidad de Salamanca, Salamanca 37008, Spain.
The Dodd-Walls Centre for Photonic and Quantum Technologies, Dunedin 9054, New Zealand and Department of Physics, University of Otago, Dunedin 9054, New Zealand.
Phys Rev Lett. 2019 Jul 26;123(4):043401. doi: 10.1103/PhysRevLett.123.043401.
Cold collisions of light molecules are often dominated by a single partial wave resonance. For the rotational quenching of HD (v=1, j=2) by collisions with ground state para-H_{2}, the process is dominated by a single L=2 partial wave resonance centered around 0.1 K. Here, we show that this resonance can be switched on or off simply by appropriate alignment of the HD rotational angular momentum relative to the initial velocity vector, thereby enabling complete control of the collision outcome.
轻分子的冷碰撞通常由单个分波共振主导。对于 HD（v=1，j=2）通过与基态 para-H_2 的碰撞的旋转猝灭，该过程由一个以 0.1 K 为中心的单个 L=2 分波共振主导。在这里，我们表明，通过 HD 旋转角动量相对于初始速度矢量的适当取向，可以简单地打开或关闭此共振，从而实现对碰撞结果的完全控制。
