The effect of spatial and other external confinements on the ground and excited state energy
levels of many electron atoms, ions and exotic systems is discussed. Special emphasis is …

The field of liquid‐phase and solid‐state high‐pressure chemistry has exploded since the
advent of the diamond anvil cell, an experimental technique that allows the application of …

The hydrogen atom within a spherical box with impenetrable walls has recently been
investigated in connection with the hyperfine splitting1 and SCF calculations. 2 Both of these …

The Shannon information entropy of 1-normalized electron density in position and
momentum space S r and S p⁠, and the sum ST⁠, respectively, are reported for the ground …

Time dependent variation perturbation calculations have been performed for estimating the
transition energies, oscillator strengths and transition probability values for a few dipole …

The model of the confined hydrogen atom (CHA) was developed by Michels et al.[1] in the
mid-1930s to study matter subject to extreme pressure. However, since the eigenvalues …

The in situ pressure acting on the surface of an open system at the atomic level is defined
and determined by the virial theorem for a proper open system, one whose spatial boundary …

The electronic structure of several many‐electron atoms, confined within a penetrable
spherical box, was studied using the Hartree–Fock (HF) method, coupling the Roothaan's …

In the model of a compressed atom (or ion) considered in the present paper the boundary
condition associated with the corresponding uncompressed atom, ie, the condition that the …

The Shannon entropy in the atomic, molecular and chemical physics context is presented by
using as test cases the hydrogenic-like atoms H c, He c+ and Li c 2+ confined by an …