It was found that irradiation created only a self-trapped hole of I2- form in this material. This contrasted with other alkali silver iodides, in which I0 was stable, or ammonium silver halides and alkali-ammonium silver iodides, in which both (halogen)2- and (halogen)0 were stable. The electronic band structure in the fundamental absorption region of this material was the same as in other alkali silver iodides. It was therefore concluded that the structure of the self-trapped hole in the present material was not due only to the electronic band structure.

T.Awano, T.Matsuyama: Materials Science Forum, 1997, 239-241, 175-8