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Citation: Huang Hong-Xin. Self-optimizing Surplus Function Quantum Monte Carlo Approach[J]. Acta Physico-Chimica Sinica, ;2003, 19(08): 742-746. doi: 10.3866/PKU.WHXB20030814 shu

Self-optimizing Surplus Function Quantum Monte Carlo Approach

Huang Hong-Xin

1.
Department of Chemistry, Hunan Normal University, Changsha　410081

Received Date: 27 December 2002
Available Online: 15 August 2003

This paper proposes a novel surplus function quantum Monte Carlo al rithm, which is a self-optimizing and self-improving procedure. In contrast to previous procedure, the trial function is optimized synchronistically in the surplus function method, but not before the variational Monte Carlo computation. In order to optimize the trial function, an improved steepest descent technique is used, with the step size automatically adjusted to obtain a procedure, which converges superlinearly. The author also uses a novel correlation function, which has both the correct electron-electron and electron-nucleus cusp conditions. The method is employed to calculate the ground state energies of H2、LiH、Li2、H2O and the energy values of X 3B1 state, 1 1A1 state, and 2 1A1 state of CH2.
- Surplus function quantum Monte Carlo approach;Self-optimizing procedure;Correlation function
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