Abstract
The photoionization spectrum of an atom in a magnetic field is calculated by combining R-matrix propagation with local adiabatic basis expansions. This approach considerably increases the speed and the energy range over which calculations can be performed compared to previous methods, allowing one to obtain accurate partial and total cross sections over an extended energy range for an arbitrary magnetic field strength. In addition, the cross sections for all atoms of interest can be calculated simultaneously in a single calculation. Multichannel quantum defect theory allows for a detailed analysis of the resonance structure in the continuum. Calculated cross sections for a range of atoms at both laboratory and astrophysical field strengths are presented.
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