We investigate the electronic structure of the helium atom in a magnetic field between B= 0
and. The atom is treated as a nonrelativistic system with two interacting electrons and a fixed …

The nature of the strong absorption features in the white dwarf GD229 has been a real
mystery ever since it was found to be magnetic in 1974. All attempts to explain the spectrum …

The quantum dynamical evolution of atomic and molecular aggregates, from their compact
to their fragmented states, is parametrized by a single collective radial parameter. Treating …

We introduce the combination technique for the numerical solution of d-dimensional
eigenproblems on sparse grids. Here, O (d·(log N) d-1) different problems, each of size O …

It is an indisputable fact that computational physics form part of the essential landscape of
physical science and physical education. When writing such a book, one is faced with …

The helium atom in a strong magnetic field B⩽ 2.35× 10 5 T is studied with the help of the
Lagrange-mesh method, in the case of an infinitely heavy nucleus. An approximate …

Abstract Using a Hartree-Fock mesh method and a configuration-interaction approach
based on a generalized Gaussian basis set, we investigate the behavior of the exchange …

In this work, we apply approximate expansions of Gaussian-type geminals of r 12 to replace
the integer and half-integer powers of r 12 in Hylleraas-Gaussian basis, and use a full …

In only three of the 61 known magnetic white dwarfs helium has been identified
unambiguously while about 20% of all non-magnetic stars of this class are known to contain …

We give the explicit form of the Hylleraas–Breit transform in the current paper and apply it to
fixed-nucleus problems of heliumlike ions. Employing the relation between the total angular …