静电场中极性$^1 Σ$态分子非弹性碰撞的抑制
Suppression of inelastic collisions of polar $^1 Σ$ state molecules in an electrostatic field
摘要：
极性$^{1}Σ$状态的分子在超低能量的碰撞被认为是，在一个模型，占长程偶极-偶极相互作用，加上旋转的分子。我们预测偶极驱动的非弹性碰撞在高值的施加电场，即，几倍的场值$B_e/μ$的实质性抑制。这里，$B_e$是转动常数，$μ$是分子的电偶极矩。非弹性截面的突然大幅下降归因于分子转动能级之间简并的发生，这极大地改变了散射哈密顿量。由于弹性碰撞率与非弹性碰撞率之比很大，我们预测，如果存在大的偏置电场，蒸发冷却对于处于弱场寻求态的$^{1}Σ$态分子是可行的。
英文摘要：
Collisions of polar $^{1}Σ$ state molecules at ultralow energies are considered, within a model that accounts for long-range dipole-dipole interactions, plus rotation of the molecules. We predict a substantial suppression of dipole-driven inelastic collisions at high values of the applied electric field, namely, field values of several times $B_e/μ$. Here $B_e$ is the rotational constant, and $μ$ is the electric dipole moment of molecules. The sudden large drop in the inelastic cross section is attributed to the onset of degeneracy between molecular rotational levels, which dramatically alters the scattering Hamiltonian. As a result of the large ratio of elastic to inelastic collision rates, we predict that evaporative cooling may be feasible for $^{1}Σ$ state molecules in weak-field-seeking states, provided a large bias electric field is present.
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