Characterization of the Chandrasekhar correlated two-electron wavefunction using Fisher, Shannon and statistical complexity information measures

The three-parameter two-electron correlated analytic wavefunction of Chandrasekhar, parametrized using three physically meaningful conditions on the electron density, is assessed using several information theory measures, the Fisher information, Shannon entropy, and statistical complexity, and compared to the results for the same measures using hydrogenic and Hartree–Fock (HF) orbitals.