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| Multistate Complete-Active-Space Second-Order Perturbation Theory Based on Density Matrix Renormalization Group Reference States | |
| Yanai, T; Saitow, M; Xiong, XG; Chalupsky, J; Kurashige, Y; Guo, S; Sharma, S | |
| 2017 | |
| 发表期刊 | JOURNAL OF CHEMICAL THEORY AND COMPUTATION
 |
| ISSN | 1549-9618 |
| 卷号 | 13期号:10页码:4829-4840 |
| 文章类型 | 期刊论文 |
| 摘要 | We present the development of the multistate multireference second-order perturbation theory (CASPT2) with multiroot references, which are described using the density matrix renormalization group (DMRG) method to handle a large active space. The multistate first-order wave functions are expanded into the internally contracted (IC) basis of the single-state single-reference (SS-SR) scheme, which is shown to be the most feasible variant to use DMRG references. The feasibility of the SS-SR scheme comes from two factors: first, it formally does not require the fourth-order transition reduced density matrix (TRDM) and second, the computational complexity scales linearly with the number of the reference states. The extended multistate (XMS) treatment is further incorporated, giving suited treatment of the zeroth-order Hamiltonian despite the fact that the SS-SR based IC basis is not invariant with respect to the XMS rotation. In addition, the state-specific fourth-order reduced density matrix (RDM) is eliminated in an approximate fashion using the cumulant reconstruction formula, as also done in the previous state-specific DMRG-cu(4)-CASPT2 approach. The resultant method, referred to as DMRG-cu(4)-XMS-CASPT2, uses the RDMs and TRDMs of up to third-order provided by the DMRG calculation. The multistate potential energy curves of the photoisomerization of diarylethene derivatives with CAS(26e,24o) are presented to illustrate the applicability of our theoretical approach. |
| 关键词 | Initio Quantum-chemistry Gaussian-basis Sets Wave-functions Excited-states Unitary-invariant Energy Gradients Size-consistent Product States Level Shift Atoms Li |
| DOI | 10.1021/acs.jctc.7b00735 |
| 关键词[WOS] | INITIO QUANTUM-CHEMISTRY ; GAUSSIAN-BASIS SETS ; WAVE-FUNCTIONS ; EXCITED-STATES ; UNITARY-INVARIANT ; ENERGY GRADIENTS ; SIZE-CONSISTENT ; PRODUCT STATES ; LEVEL SHIFT ; ATOMS LI |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000412965700019 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.sinap.ac.cn/handle/331007/28743 |
| 专题 | 中科院上海应用物理研究所2011-2018年 |
| 推荐引用方式 GB/T 7714 | Yanai, T,Saitow, M,Xiong, XG,et al. Multistate Complete-Active-Space Second-Order Perturbation Theory Based on Density Matrix Renormalization Group Reference States[J]. JOURNAL OF CHEMICAL THEORY AND COMPUTATION,2017,13(10):4829-4840. |
| APA | Yanai, T.,Saitow, M.,Xiong, XG.,Chalupsky, J.,Kurashige, Y.,...&Sharma, S.(2017).Multistate Complete-Active-Space Second-Order Perturbation Theory Based on Density Matrix Renormalization Group Reference States.JOURNAL OF CHEMICAL THEORY AND COMPUTATION,13(10),4829-4840. |
| MLA | Yanai, T,et al."Multistate Complete-Active-Space Second-Order Perturbation Theory Based on Density Matrix Renormalization Group Reference States".JOURNAL OF CHEMICAL THEORY AND COMPUTATION 13.10(2017):4829-4840. |
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