  The lowest bound states of the hydrogen negative ion and negative donor
systems in a homogeneous magnetic field are investigated theoretically via a
full configuration interaction approach with an anisotropic Gaussian basis set.
The broad magnetic field regime \gamma=0.0008 - 4000 is covered.
Nonrelativistic total energies, electron detachment energies and transition
wavelengths are presented assuming an infinite nuclear mass. The binding
mechanisms are discussed in detail. The accuracy for the energies is enhanced
significantly compared to previously published data.
