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Equation-of-motion coupled-cluster methods for atoms and molecules in strong magnetic fields

机译:强磁场中原子和分子的运动耦合方法

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A program for the direct calculation of excitation energies of atoms and molecules in strong magnetic fields is presented. The implementation includes the equation-of-motion coupled-cluster singles-doubles (EOM-CCSD) method for electronically excited states as well as its spin-flip variant. Differences to regular EOM-CCSD implementations are due to the appearance of the canonical angular-momentum operator in the Hamiltonian causing the wave function to become complex. The gauge-origin problem is treated by the use of gauge-including atomic orbitals. Therefore, a modified Davidson method for diagonalizing complex non-Hermitian matrices is used. Excitation energies for selected atoms and molecules that are of importance in the astrochemical context are presented and their dependence on the magnetic field is discussed. Published by AIP Publishing.
机译:提出了一种用于直接计算强磁场中原子和分子的激发能量的程序。 该实现包括用于电子激发状态的运动方程耦合簇单打 - 双打(EOM-CCSD)方法以及其旋转翻转变量。 常规EOM-CCSD实施的差异是由于汉密顿时的规范角动量操作者的外观导致波浪功能变得复杂。 通过使用仪表 - 包括原子轨道来治疗衡量标志的问题。 因此,使用用于对角度化复杂非密封矩阵的修改的Davidson方法。 讨论了在星体化学背景下具有重要性的所选原子和分子的激发能量,并且讨论了它们对磁场的依赖。 通过AIP发布发布。

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