Theory Of Scattering For Quasifree Particles, AIn this book, the author presents the theory of quasifree quantum fields and argues that they could provide non zero scattering for some particles. The free field representation of the quantised transverse electromagnetic field is not closed in the weak* topology. Its closure contains soliton anti soliton pairs as limits of two photon states as time goes to infinity, and the overlap probability can be computed using Uhlmann's prescription. There are