Emission spectra for ArNe binary crystals

Emission spectra for ArNe binary crystals have been measured in the range of 6–18 eV at the Ar concentration of 0.01 – 100 mol%. Luminescence was excited by slow electrons at T = 5°K. The spectrum of excitons bound on the atomic and molecular type centres is observed. The energies of radiative transition in a crystal appear to be very close to those in a gas phase because of the relaxation processes at which the resonance exchange interaction decreases considerably. The bands of atomic centres display a fine structure which reflects the effect of the lattice crystal field of Ne. For the ArNe crystals it has been shown that excitons are not thermalized completely and there is the independent relaxation of the lowest states of various Wanier series to local excitons. A scheme for the relaxation process in argon involving the formation of a molecular centre Ar₂¹ is given.