Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (7): 2286.doi: 10.7503/cjcu20210138

• Article • Previous Articles     Next Articles

Solutions of Atomic and Molecular Schrödinger Equations with One-dimensional Function Approach

SARWONO Yanoar Pribadi1,2,4, UR RAHMAN Faiz1, ZHAO Rundong3, ZHANG Ruiqin1,2,4()   

  1. 1.Department of Physics,City University of Hong Kong,Hong Kong,China
    2.Beijing Computational Science Research Center,Beijing 100193,China
    3.School of Physics,Beihang University,Beijing 100191,China
    4.Shenzhen JL Computational Science and Applied Research Institute,Shenzhen 518131,China
  • Received:2021-03-03 Online:2021-07-10 Published:2021-05-20
  • Contact: ZHANG Ruiqin E-mail:rqzhang@csrc.ac.cn
  • Supported by:
    This paper is supported by the National Natural Science Foundation of China-China Academy of Enginee-ring Physics(CAEP) Joint Fund NSAF(U1930402)

Abstract:

Rigorous numerical techniques to solve the Schr?dinger equation are both interesting and desirable, particularly with one that can include new features beyond the standard methods. In this article, we review one-dimensional function(1D function) approach developed recently by us to obtain the solutions of the Schr?dinger equations of atomic and molecular systems where one-dimensional basis functions have been applied to separate components. A uniform real-space grid representation of the electronic wavefunctions is employed; hence, a refinement technique of residual vector correction can be implemented. The 1D function approach facilitates such convenient numerical integrations that many problems related with the many-electron multi-center potential molecular integrals are circumvented. The converged energy is obtained from a strictly upper bound one, while the obtained two-electron Schr?dinger wavefunction exhibits the electron correlation effect on one-electron distribution. Different from density functional theory or Hartree-Fock with the assumed particle-separability, the obtained solution treats more accurately many-body effect of electron correlation found in the electron-electron repulsion energy.

Key words: Solutions of Schr?dinger equations, One-dimensional function approach, Hydrogen atom, Helium and its isoelectronic ion, Hydrogen molecule and ion

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