期刊
JOURNAL OF CHEMICAL PHYSICS
卷 154, 期 1, 页码 -出版社
AIP Publishing
DOI: 10.1063/5.0035233
关键词
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资金
- U.S. Department of Energy, Office of Science, Office of Advanced Scientific Computing, Scientific Discovery through Advanced Computing (SciDAC) program
- Chemical Sciences, Geosciences, and Biosciences Division in the Office of Basic Energy Sciences of the U.S. Department of Energy [DE-AC02-05CH11231]
A new method for CASPT2 analytical gradients is proposed in this study, utilizing the supporting subspace method and MP2, Fock derivatives, which can calculate gradients more efficiently, reduce computational costs, and has wide applications in fields such as ab initio molecular dynamics simulations and geometry optimization.
We present a reduced scaling and exact reformulation of state specific complete active space second-order perturbation (CASPT2) analytical gradients in terms of the MP2 and Fock derivatives using the supporting subspace method. This work follows naturally from the supporting subspace formulation of the CASPT2 energy in terms of the MP2 energy using dressed orbitals and Fock builds. For a given active space configuration, the terms corresponding to the MP2-gradient can be evaluated with O(N-5) operations, while the rest of the calculations can be computed with O(N-3) operations using Fock builds, Fock gradients, and linear algebra. When tensor-hyper-contraction is applied simultaneously, the computational cost can be further reduced to O(N-4) for a fixed active space size. The new formulation enables efficient implementation of CASPT2 analytical gradients by leveraging the existing graphical processing unit (GPU)-based MP2 and Fock routines. We present benchmark results that demonstrate the accuracy and performance of the new method. Example applications of the new method in ab initio molecular dynamics simulation and constrained geometry optimization are given.
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