PHOTOIONIZATION AND OPTICAL-ABSORPTION OF SINGLET EXCITONS IN A TERT-STILBENE CRYSTAL - EXCITATION-ENERGY DEPENDENCE OF THE IONIZATION EFFICIENCY

Photoionization and optical absorption of singlet excitons in a t-stilbene crystal have been studied. The ionization efficiency of the singlet exciton is a constant over the energy range of 5.4-6.5 eV. This is another example indicating that autoionization after a rapid relaxation is a common behaviour of this class of materials. © 1990.