Scissors Mode and dichroism in an anisotropic crystal
  We suggest that in an anisotropic crystal there should be a new mechanism of dichroism related to a scissors mode, a kind of excitation observed in several other many-body systems. Such an effect should be found in crystals, amorphous systems and also metallo-proteins. Its signature is a strong magnetic dipole transition amplitude, which is a function of the angle between the momentum of the photon and the anisotropy axis of the cell. 
Keisuke Hatada, Kuniko Hayakawa, Fabrizio Palumbo