  The electronic structure of the helium atom in the magnetic field regime
B=0-100a.u. is investigated, using a full configuration interaction approach
which is based on a nonlinearly optimized anisotropic Gaussian basis set of
one-particle functions. The corresponding generalized eigenvalue problem is
solved for the magnetic quantum number M=-1 and for both even and odd z-parity
as well as singlet and triplet spin symmetry. Accurate total electronic
energies of the ground state and the first four excitations in each subspace as
well as their one-electron ionization energies are presented as a function of
the magnetic field. Additionally we present energies for electromagnetic
transitions within the M=-1 subspace and between the M=-1 subspace and the M=0
subspace treated in a previous work. A complete table of wavelengths and field
strengths for the detected stationary points is given.
