利用电场操控旋转激发冷分子中的自旋相关相互作用。

Manipulating spin-dependent interactions in rotationally excited cold molecules with electric fields.

作者信息

Tscherbul T V, Krems R V

机构信息

Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.

出版信息

J Chem Phys. 2006 Nov 21;125(19):194311. doi: 10.1063/1.2374896.

DOI:10.1063/1.2374896

PMID:17129107

Abstract

We use rigorous quantum mechanical theory to study collisions of magnetically oriented cold molecules in the presence of superimposed electric and magnetic fields. It is shown that electric fields suppress the spin-rotation interaction in rotationally excited 2Sigma molecules and inhibit rotationally elastic and inelastic transitions accompanied by electron spin reorientation. We demonstrate that electric fields enhance collisional spin relaxation in 3Sigma molecules and discuss the mechanisms for electric field control of spin-changing transitions in collisions of rotationally excited CaD(2Sigma) and ND(3Sigma) molecules with helium atoms. The propensities for spin depolarization in the rotationally excited molecules are analyzed based on the calculations of collision rate constants at T=0.5 K.

摘要

我们运用严格的量子力学理论来研究在叠加电场和磁场存在的情况下磁取向冷分子的碰撞。结果表明，电场会抑制转动激发的2Σ分子中的自旋 - 转动相互作用，并抑制伴随电子自旋重新取向的转动弹性和非弹性跃迁。我们证明电场会增强3Σ分子中的碰撞自旋弛豫，并讨论了转动激发的CaD（2Σ）和ND（3Σ）分子与氦原子碰撞中自旋变化跃迁的电场控制机制。基于在T = 0.5 K时碰撞速率常数的计算，分析了转动激发分子中自旋去极化的倾向。