Electron-trapped centers,Pb+andPb0, in x-rayed KCl:Pb2+

Optical-absorption spectra of KCl:${\mathrm{Pb}}^{2+}$ crystals irradiated with x rays at room temperature have been investigated in the temperature range 90-450 K. It is suggested that the absorption band observed in the vicinity of 253 nm originates from ${\mathrm{Pb}}^{+}$ whereas the absorption band at 285 nm originates from ${\mathrm{Pb}}^0$.