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arXiv 1202.4531physics.chem-phphysics.atom-ph
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电场中原子-分子碰撞的全angular momentum表示

Total angular momentum representation for atom-molecule collisions in electric fields

T. V. Tscherbul

摘要:

结果表明,在存在外部电场的原子-分子碰撞问题可以解决使用总角动量表示在体固定坐标系中,导致一个计算效率高的方法从头模拟低温散射现象。我们的计算表明,快速收敛的截面的振动和斯塔克弛豫在He-CaD碰撞的总角动量态的数量在基组中,导致5-100倍的计算效率比以前使用的方法的基础上完全解耦的空间固定表示。这些结果开辟了可能性进行数值收敛的量子散射计算的原子-分子碰撞和化学反应的广泛存在的电场。

英文摘要:

It is shown that the atom-molecule collision problem in the presence of an external electric field can be solved using the total angular momentum representation in the body-fixed coordinated frame, leading to a computationally efficient method for ab initio modeling of low-temperature scattering phenomena. Our calculations demonstrate rapid convergence of the cross sections for vibrational and Stark relaxation in He-CaD collisions with the number of total angular momentum states in the basis set, leading to a 5-100 fold increase in computational efficiency over the previously used methods based on the fully uncoupled space-fixed representation. These results open up the possibility of carrying out numerically converged quantum scattering calculations on a wide array of atom-molecule collisions and chemical reactions in the presence of electric fields.

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