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The photoionisation of atomic hydrogen and hydrogenic ions in intense magnetic fields

Calculations of the photoionisation of the lowest even- and lowest odd-parity levels of atomic hydrogen in a magnetic field (lo3 c B < lo5 T) at photon energies from the ionisation threshold to 87 Ryd above it are reported. The appropriate generalisation of the Wigner threshold law is given. Resonances are found at each embedded discrete continuum level and secondary maxima associated with the motion along the field are predicted, and confirmed analytically in a simple model. The results may be extended to any hydrogenic ion using a recent theorem of Wunner et al, which is quoted.