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科学领域:

  • 计算化学是一种计算化学.
  • 量子化学是一种量子化学.
  • 相对主义分子计算.

背景情况:

  • 合集群 (CC) 方法对于准确的分子电子结构至关重要.
  • 分析能量导数对于计算分子性质至关重要.
  • 对于重元素和精确计算来说,相对论效应很重要.

研究的目的:

  • 实施用于一般合集群 (CC) 模型的能量分析第一导数的自动生成.
  • 在DIRAC程序包中,报告第一次实施的三倍和四倍激发 (CCSDT和CCSDTQ) 的合集群的预期值.
  • 为了计算和化合物的核电四极子时刻.

主要方法:

  • 利用tenpi工具链自动生成分析衍生值.
  • 在DIRAC程序中实现了CCSDT和CCSDTQ预期值.
  • 在各种化合物的和原子核中计算电场梯度 (EFG).

主要成果:

  • 成功计算了EFG的三倍和四倍激发的校正.
  • 确定了-27 (Q(27Al)) 的核电四极矩为0.146598 ± 0.000001 b,与推值非常一致.
  • 获得了-7 (Q(7Li)) 的核电四极矩为-0.038624 ± 0.000292 b,低于当前推值,建议进一步研究.

结论:

  • 开发的方法可以准确计算核电四极电流的时刻.
  • 新的实施方便了相对论系统的高级合集群计算.
  • 获得的Q(7Li) 值表明可能需要对当前的实验或理论建议进行重新评估.