PHOTOIONISATION OF HYDROGEN IN A STRONG MAGNETIC-FIELD

The authors present computed cross sections for the photoionisation of a hydrogen atom in a magnetic field of 2000 T, which show the same qualitative features as such spectra observed at lower fields. The quantum-mechanical ansatz used yields a system of coupled differential equations in the coordinate parallel to the magnetic field, which is solved numerically with a new, very stable integration procedure based on the logarithmic derivative method. Matching to MQDT functions in the asymptotic region, the photoionisation spectrum can be calculated most efficiently.