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 × 10 8 T, relevant for astrophysical problems, e.g., the thermal emission of strongly magnetized isolated neutron stars.
We use the combination of a two-dimensional Hartree-Fock and a diffusion quantum Monte Carlo method, which we both recently presented in this journal [Phys. Rev. A 88, 012509 (2013)] for a thorough investigation of the ground state configurations of all atoms and ions with Z = 2-10 with the exception of hydrogen-like systems in strong magnetic fields. We obtain the most comprehensive data set of ground state configurations as a function of the magnetic field strength currently available and hence are able to analyze and compare the properties of systems with different core charges and electron numbers in detail.
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