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Spectrum of neutral helium in strong magnetic fields

1999; American Physical Society; Volume: 59; Issue: 4 Linguagem: Inglês

10.1103/physreva.59.2875

1538-4446

Matthew D. Jones, Gerardo Ortíz, David M. Ceperley,

Cold Atom Physics and Bose-Einstein Condensates

We present extensive and accurate calculations for the excited state spectrum of spin-polarized neutral helium in a range of magnetic field strengths up to $10^{12}$ G. Of considerable interest to models of magnetic white dwarf stellar atmospheres, we also present results for the dipole strengths of the low lying transitions among these states. Our methods rely on a systematically saturated basis set approach to solving the Hartree--Fock self-consistent field equations, combined with an ``exact'' stochastic method to estimate the residual basis set truncation error and electron correlation effects. We also discuss the applicability of the adiabatic approximation to strongly magnetized multi-electron atoms.