Radiation Processes . ... Radiative transfer: emission; absorbtion; scattering; radiative transfer equation; optical depth; Kirchoff's law; introduction to emission processes. (pdf) . Bremstrahlung emission: outline of physics involved; absorbtion and optical depth; typical spectrum; examples. (pdf) . ... Emission lines: Einstein parameters; radiative transfer revisited; collisional excitation; equivalent widths; examples. (pdf) . ...