电荷转移激发态：在变分Monte Carlo中寻求平衡有效的波函数分析
Charge-transfer excited states: Seeking a balanced and efficient wave function ansatz in variational Monte Carlo
摘要：
本文提出了一种简单有效的波函数方法，用于实空间量子蒙特卡罗方法中电荷转移激发态的处理。使用最近引入的响应后变分方法[J. Chem. Phys. 145，081103（2016）]，该方法允许在配置相互作用单扩展之外执行关键的轨道优化步骤，同时仅需要计算两个斯莱特行列式对象。我们针对拉伸LiF分子的说明性示例、甲醛的一系列激发态以及最后更具挑战性的乙烯-四氟乙烯分子证明了这种假设。
英文摘要：
We present a simple and efficient wave function ansatz for the treatment of excited charge-transfer states in real-space quantum Monte Carlo methods. Using the recently-introduced variation-after-response method [J. Chem. Phys. 145, 081103 (2016)], this ansatz allows a crucial orbital optimization step to be performed beyond a configuration interaction singles expansion, while only requiring calculation of two Slater determinant objects. We demonstrate this ansatz for the illustrative example of the stretched LiF molecule, for a range of excited states of formaldehyde, and finally for the more challenging ethylene-tetrafluoroethylene molecule.
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