CaF、SrF 和 BaF 电离势的精确理论确定
Accurate theoretical determination of the ionization potentials of CaF, SrF, and BaF
AI总结:
本文采用相对论 CCSD(T) 方法并结合高阶激发与 QED 修正,精确计算了 CaF、SrF 和 BaF 的电离势,其中 CaF 和 BaF 与实验高度吻合,并为 SrF 提供了与现有实验存在偏差的新预测。
摘要:
我们利用当前最先进的相对论耦合簇方法,包含单激发、双激发和微扰三激发(CCSD(T)),对 MF(M= Ca, Sr, Ba)分子的电离势进行了全面的理论研究。我们进一步对高阶激发(最高到完整三激发)以及 QED 自能和真空极化贡献进行了修正。我们对各种计算参数对所得电离势的影响进行了广泛研究,这使我们能够为预测结果赋予符合实际的误差范围。对于已有精确实验数据的 CaF 和 BaF,我们的预测与实验测量值高度一致。对于 SrF,我们给出了一个新的精确电离势预测,该结果与现有实验数据存在偏差,从而为后续实验研究提供了动力。
英文摘要:
We present a comprehensive theoretical study of the ionization potentials of the MF (M= Ca, Sr, Ba) molecules using the state-of-the-art relativistic coupled cluster approach with single, double, and perturbative triple excitations (CCSD(T)). We have further corrected our results for the higher order excitations (up to full triples) and the QED self energy and vacuum polarisation contributions. We have performed an extensive investigation of the effect of the various computational parameters on the calculated ionisation potentials, which allowed us to assign realistic uncertainties on our predictions. For CaF and BaF, where precise experiments are available, our predictions are in excellent agreement with the measured values. In case of SrF, we provide a new accurate prediction of the ionisation potential that deviates from the available experimental data, motivating further experimental investigations.
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