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SDSPT2s:具有选择的SDSPT2

Yibo Lei¹, Yang Guo², Bingbing Suo³

¹Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education, College of Chemistry and Materials Science, Shaanxi Key Laboratory of Physico-Inorganic Chemistry, Northwest University, Xi'an 710127, China.

Journal of chemical theory and computation

|January 23, 2025

概括

这项研究介绍了SDSPT2s,这是多参考二次扰动理论的高效近似. 它通过选择和截断方法来减少计算复杂性,使更大的系统能够进行准确的计算.

科学领域:

计算化学计算化学
量子化学是一个量子化学.
理论化学理论化学

背景情况:

静态-动态-静态 (SDS) 配置交互 (CI) 是一种最小的多引用配置交互 (MRCI) 方法.
SDSPT2是一种类似于CI的多引用二次扰动理论 (PT2),它接近于SDSCI.
SDSPT2 均处理单个和多个根,允许配置选择.

研究的目的:

为SDSPT2提供一个高效的近似,称为SDSPT2s (选择的SDSPT2).
为更大,更复杂的系统提供准确的量子化学计算.
通过具有挑战性的计算展示来证明SDSPT2s的适用性.

主要方法:

配置选择应用于一个大的完整主动空间 (CAS),以减少参考空间.
通过将缩小的参考空间连接到整个第一阶交互空间的一小部分来减少交互空间.
减少交互空间中计算最昂贵的部分通过绕过其生成并应用基于整数的切断值来截断.
内部收缩系数被有效地评估和存储.

主要成果:

在SDSPT2s中的选择-截断程序实现了这种减少,但精度略有下降.
证实SDSPT2s适用于基于CAS的标准SDSPT2.2难以处理的系统.
几个具有挑战性的计算示例证明了SDSPT2s方法的有效性.

结论:

SDSPT2s显著提高了多参照二次扰动理论对更大的量子化学系统的适用性.
该方法为研究以前无法达到的复杂分子系统提供了一个计算可行的方法.
这项工作推进了理论化学的能力,用于准确的电子结构计算.

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SDS-PAGE

SDS-PAGE

Gel electrophoresis is a method that separates biological macromolecules like nucleic acids or proteins by forcing them to pass through a gel matrix under an electric field.
A variation of gel electrophoresis, termed polyacrylamide gel electrophoresis (PAGE), is commonly used for separating proteins according to their molecular size by passing them through a polyacrylamide gel. Because of the varying charges associated with amino acid side chains, PAGE can be used to separate intact...