  A collision of two-component Bose-Einstein condensates in the presence of
Raman coupling is proposed and studied by numerical simulations. Raman
transitions are found to be able to reduce collision-produced irregular
excitations by forming a time-averaged attractive optical potential. Raman
transitions also support a kind of dark soliton pairs in two-component
Bose-Einstein condensates. Soliton pairs and their remnant single solitons are
shown to be controllable by adjusting the initial relative phase between the
two colliding condensates or the two-photon detuning of Raman transitions.
