The behavior of an atom in magnetic field is a basic problem.In this paper,the splitting of energy levels for a single electron atom in a magnetic field is discussed by using two different methods,namely quantum mechanics and group theory.The merits of these methods are compared.
Basic electromagnetism and relativistic quantum theory are used to evaluate the magnetic field due to the electron in a one-electron atom. The field patterns are displayed and discussed for several eigenstates with low values of the quantum numbers. The effect of increasing the number of protons in the nucleus is shown explicitly. Comparison with the non-relativistic result illustrates the effects of relativity in atoms. There is a brief discussion of the meaning of the terms spin and orbital magnetic moment of an atom in the light of these results.
Using a combination of a fast two-dimensional-Hartree-Fock-Roothaan method and highly accurate fixed-phase diffusion quantum Monte Carlo simulations, we analyze the electronic structure and calculate the energy of the ground states of atoms with nuclear charges Z=2−−26 in very strong magnetic fields $B={10}^{7}--5\ifmmode\times\else\texttimes\fi{}{10}^{8}\phantom{\rule{0.28em}{0ex}}\mathrm{T}$, relevant for astrophysical problems, e.g., the thermal emission of strongly magnetized isolated neutron stars.
The energy levels of hydrogen and helium atoms in strong magnetic fields are calculated in this study. The current work contains estimates of the binding energies of the first few low-lying states of these systems that are improvements upon previous estimates. The methodology involves computing the eigenvalues and eigenvectors of the generalized two-dimensional Hartree-Fock partial differential equations for these one- and two-electron systems in a self-consistent manner. The method described herein is applicable to calculations of atomic structure in magnetic fields of arbitrary strength as it exploits the natural symmetries of the problem without assumptions of any basis functions for expressing the wave functions of the electrons or the commonly employed adiabatic approximation. The method is found to be readily extendable to systems with more than two electrons.