EMISSION OF DEEXCITATION X-RAYS FROM RADIATIVE ELECTRON-CAPTURE INTO BARE PROJECTILES AS THE INVERSE OF 2-STEP PHOTOIONIZATION

In relativistic collisions between bare high-Z ions and low-Z target a toms, electron capture into the ground and excited projectile states i s almost completely caused by the time-reserved photoelectric effect, i.e. radiative electron capture. A study of the REC process into bare high-Z can therefore be utilized for the investigation of the photoele ctric effect. In this paper we present data for the inverse of the two -step photo-ionization process, which were obtained by measuring the a ngular distribution of the Ly alpha(1), (2p(3/2) --> 1s(1/2) de-excita tion photons induced by REC into the 2p(3/2) state of initially bare h igh-Z ions. The anisotropic emission, revealed by the experiments, dem onstrates that the population of the magnetic substates by REC in fast collisions deviates strongly from the statistical one, and that it mu st lead to a strongly polarized Ly alpha(1)-radiation.