论文标题
在电场中的Förster共振周围的超速双极分子之间进行两体碰撞的模型
Model for two-body collisions between ultracold dipolar molecules around a Förster resonance in an electric field
论文作者
论文摘要
我们提出了一个单渠道，简单的模型，以描述Förster共振周围的超低偶极分子的动力学。略高于特定的电场，可以进行碰撞屏蔽，从而抑制气体中的分子损失。量子物理机制的总体描述又回到了独特的能量表面上的动力学，这取决于分子的相对距离和角接近。该表面使该表面如何通过电场和偶极 - 偶极相互作用在过程中诱导和互锁的分子的偶极矩，尤其是当触发屏蔽时。平均在独特的部分波（达到超低状态时最低）上的相对角运动，该模型很好地再现了实验观察到的速率系数的行为并在理论上预测[Matsuda等，Science 370，1324（2020）； Li等人，Nat。物理。 17，1144（2021）]。这种经济模型封装了量子过程的主要物理。因此，它可以用作全面量子动力处理的替代方法，并有望在将来对涉及更多身体的碰撞进行研究。
We propose a one-channel, simple model to describe the dynamics of ultracold dipolar molecules around a Förster resonance. Slightly above a specific electric field, a collisional shielding can take place, suppressing the molecular losses in a gas. The overall description of the quantum physical mechanism comes back to the dynamics on a unique energy surface, which depends on the relative distance and angular approach of the molecules. This surface enables to interpret how the dipole moments of the molecules are induced and interlocked by the electric field and the dipole-dipole interaction during the process, especially when the shielding is triggered. Averaging the relative angular motion over a unique partial wave (the lowest one when the ultracold regime is reached), the model reproduces well the behaviour of the rate coefficients observed experimentally and predicted theoretically [Matsuda et al., Science 370, 1324 (2020); Li et al., Nat. Phys. 17, 1144 (2021)]. This economic model encapsulates the main physics of the quantum process. Therefore, it can be used as an alternative to a full quantum dynamical treatment and is promising for future studies of collisions involving more bodies.
