Dropping the reader off next to the deep end, the first chapter introduces the quantum-mechanical concepts necessary for the deep understanding of the subject: approximations to solutions of the wave function,

electron correlation and density functional theory.

The effects due to

electron correlation are smaller for the electron concentrations n [less than or equal to] [10.

Reprinted from publication between the middle of the 20th century and the early 21st, 113 technical papers look at quantum electron crystals, nuclear structure factor and pair potentials in some sp liquid metals,

electron correlation functions in liquid metals, Thomas-Fermi semiclassical approximations, transcending Thomas-Fermi theory, and local and non-local applications of one-body potential theory.

Strong

electron correlation and the source of enhanced thermopower

Electron correlation studies by means of local-scaling transformation and electron-pair density functions.

MCSCF properly accounts for nondynamic

electron correlation, while MCQDPT optimizations ensure adequate treatment of both nondynamic and dynamic

electron correlation, which was essential for these systems.

He is interested in the development and use of accurate Gaussian basis sets and proper correlating functions for the evaluation of the

electron correlation energy in molecules and for studies of molecular properties.

By combining them with our experience in UHV technology and target preparation in a new beamline to be created in the framework of this project, we aim at investigating charge migration and transport in supramolecular assemblies, ultrafast electron dynamics in photocatalysis and dynamics of

electron correlation in high-TC superconductors.

These 12 papers address methods and approaches for these specific applications and for the reduction of computing cost in general, with topics including explicitly correlated basis functions for large molecules, Hartree-Fock-Wigner calculations in a two-electron-density functional theory, the spin-flip method, economic descriptions of

electron correlation, multilevel methods for thermochemistry and thermochemical kinetics, and the equilibrium structure of the silicon timer.

CHAPTER 18: ENTANGLEMENT,

ELECTRON CORRELATION, AND DENSITY MATRICES

The proposed material systems provide a new arena to explore diverse condensed matter phenomena such as

electron correlation, electron-phonon coupling and superconductivity.

Other articles cover natural orbital functional theory, geminal functional theory, linear inequalities for diagonal elements of density matrices, parameterization of the 2-RDM and entanglement,

electron correlation and density matrices.