On the relative contribution of the dipole-monopole and dipole-quadrupole corrections to the soft electron emission from atoms in collisions with fast charged projectiles

Soft electron emission in ionization of light atomic targets by fast charge d projectiles is considered within the first Born approximation. The dipole -monopole and dipole-quadrupole corrections to the dipole term have been ca lculated and compared. For ionization of neutral or positively charged atom ic targets the dipole-quadrupole term is shown to be the main correction to the dipole term.