Man Marijn P, Groenenboom Gerrit C, Karman Tijs
Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, Netherlands.
Phys Rev Lett. 2022 Dec 9;129(24):243401. doi: 10.1103/PhysRevLett.129.243401.
Ultracold molecules undergo "sticky collisions" that result in loss even for chemically nonreactive molecules. Sticking times can be enhanced by orders of magnitude by interactions that lead to nonconservation of nuclear spin or total angular momentum. We present a quantitative theory of the required strength of such symmetry-breaking interactions based on classical simulation of collision complexes. We find static electric fields as small as 10 V/cm can lead to nonconservation of angular momentum, while we find nuclear spin is conserved during collisions. We also compute loss of collision complexes due to spontaneous emission and absorption of black-body radiation, which are found to be slow.
超冷分子会发生“粘性碰撞”，即使对于化学性质不活泼的分子也会导致损失。通过导致核自旋或总角动量不守恒的相互作用，粘附时间可以提高几个数量级。我们基于碰撞复合体的经典模拟，提出了这种对称性破缺相互作用所需强度的定量理论。我们发现，低至10 V/cm的静电场会导致角动量不守恒，而我们发现在碰撞过程中核自旋是守恒的。我们还计算了由于黑体辐射的自发发射和吸收导致的碰撞复合体损失，发现这种损失很缓慢。
