Long-range interactions between polar alkali-metal diatoms in external electric fields
Long-range interactions between polar alkali-metal diatoms in external electric fields
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DOI：
10.1103/physreva.88.032709
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发表时间：
2013-09-26
影响因子：
2.9
通讯作者：
Dulieu, O.
中科院分区：
文献类型：
--
作者：
Lepers, M.;Vexiau, R.;Dulieu, O.
我们利用精确的量子化学结果结合现有的光谱数据，计算了包括Li， Na， K， Rb和Cs在内的所有十种极性双碱分子在其振动地面水平上的远程相互作用。在自由空间中发现8种物质存在巨大的范德华相互作用。通过改变电场大小和分子间距离，研究了平行或垂直于分子间轴的外电场诱导的范德华相互作用与偶极子-偶极子相互作用的竞争。我们的计算预测了两个分子的相互取向，但在实验室框架中没有优先方向。提出了一对超冷极性分子受激单光子辐射缔合成超冷四聚体的机制，为超冷多原子分子的光学操纵开辟了道路。
We computed the long-range interactions between two identical polar bialkali molecules in their rovibronic ground level for all ten species involving Li, Na, K, Rb, and Cs, using accurate quantum chemistry results combined with available spectroscopic data. A huge van der Waals interaction is found for eight species in free space. The competition of the van derWaals interaction with the dipole-dipole interaction induced by an external electric field parallel or perpendicular to the intermolecular axis is investigated by varying the electric-field magnitude and the intermolecular distance. Our calculations predict a regime with the mutual orientation of the two molecules but with no preferential direction in the laboratory frame. A mechanism for the stimulated one-photon radiative association of a pair of ultracold polar molecules into ultracold tetramers is proposed, which would open the way towards the optical manipulation of ultracold polyatomic molecules.