Bremsstrahlung in non-equilibrium plasma

The process of bremsstrahlung in non-equilibirium plasma is considered in the paper. It is shown that unlike the vacuum there are in plasma two types of bremsstrahlung occuring due to the transformation of virtual electromagnetic quanta, arising in collisions of charged particles, into real ones: Compton radiation and nonlinear radiation. In a quasiclassical limit matrix elements are obtained with the allowance for both new processes of bremsstrahlung and usual processes of bremsstrahlung modified by screening virtual quanta fields by plasma. The calculations are suitable for particles with arbitrary velocities, in particular, for superrelativistic and nonrelativistic particles. The rules are given for calculating the matrix elements of bremsstrahlung in plasma according to corresponding diagrams