Abstract
A systematic diffusion Monte Carlo (DMC) study of both neutral and charged atomic systems from Li to Ne in the ground state is performed to evaluate the correlation energy (Ec). the ionizution energy (IE), and the electron affinity (EA) of these systems. The present study is based on the fixed-node approximation in which the nodal surfaces of the DMC wavefunction is assumed to be the same as those of the Hartree-Fock wavefunction. The present calculations reproduce 90 ± 7% of the exact value of correlation energy for the cations, 91 ± 3% for the neutral atoms, and 92 ± 2% for the anions, respectively, The theoretical values of IE and EA in the present study are in good agreement with experimental values within an accuracy of 0.3 eV for IF, and 0.1 eV for EA. The variation of Ec and IE with respect to the atomic number Z is interpreted.
Original language | English |
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Pages (from-to) | 2612-2616 |
Number of pages | 5 |
Journal | Materials Transactions |
Volume | 47 |
Issue number | 11 |
DOIs | |
Publication status | Published - 2006 Nov |
Keywords
- Diffusion Monte Carlo
- Electron affinity
- Electron rorrelation
- Ionization energy
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering