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Dynamics of transient electron-exciton system in a pulse-photoexcited germanium is studied by means of magneto-optical measurement. By measuring time variation of the absorption intensities of electrons and excitons, validity of thermodynamical quasi-equilibrium relation between electrons and excitons is confirmed even in a transient condition. The electron-exciton system obeys the law of mass action. The absorption intensity due to excitons decreases with rising temperature, while that due to electrons increases. The lifetime of electrons is proportional to T1⁄2 between 10 and 100 K. Diffusion constants of electrons and excitons are obtained to be an order of 10 cm2/s in the presence of an external magnetic field. These values are much smaller than those obtained earlier.

DYNAMICS OF ELECTRON-EXCITON SYSTEM IN PHOTO-EXCITED Ge