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Hybridization of Atomic Orbitals II03:35

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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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When an object is in equilibrium, it is either at rest or moving with a constant velocity. There are two types of equilibrium: static and dynamic. Static equilibrium occurs when an object is at rest, while dynamic equilibrium occurs when an object is moving with a constant velocity. In both cases, there must be a balance of forces acting on the object.
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完整的活性空间代合集群理论.

Robin Feldmann1, Maximilian Mörchen1, Jakub Lang2

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此摘要是机器生成的。

我们介绍了完整的活跃空间代合集群 (CASiCC) 方法,以增强多引用合集群计算. CASiCC提高了分子研究的准确性,并保持了适度的计算成本.

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科学领域:

  • 量子化学 是一个量子化学.
  • 计算化学计算化学
  • 理论化学 理论化学

背景情况:

  • 多参考驱动的合集群 (CC) 方法对于准确描述复杂的电子结构至关重要.
  • 现有的方法在平衡精度和计算成本方面面临挑战,特别是在高度相关的系统中.

研究的目的:

  • 开发和评估一个新的算法,完整的活跃空间代合集群 (CASiCC),以改进多引用CC计算.
  • 与原型分子系统的现有方法相比,评估CASiCC的效率和准确性.

主要方法:

  • 在完整的活性空间 (CAS) 和合集群 (CC) 计算之间建立了一个代反循环.
  • 使用活动空间外的CC振幅,使用哈密尔顿式的相似性转换.
  • 在H4,H8,H2O和N2.2的单个和双重近似中测试了CASiCC替代品.

主要成果:

  • CASiCC系统地提高了单一参考合集群双重 (CCSD) 和外部纠正的CCSD在潜在能量曲线上的准确性.
  • 该方法显示了适度的计算成本.
  • 量身定制的合集群 (TCC) 在强相关性制度中表现优异,表明潜在的错误补偿机制.

结论:

  • CASiCC方法比标准和外部纠正的CC方法提供了系统的改进.
  • 发现外部纠正和量身定制的合集群方法的代版本汇聚到相同的结果.
  • CASiCC为准确和高效的量子化学计算提供了一个有前途的途径.