Free exciton absorption in zinc selenide



We have measured the absorption spectrum of the n = 1 free exciton in ZnSe from 4.2 to 190 K. By fitting to a Lorentzian, we have found the exciton peak energy, width and oscillator strength. The values are compared with published ones, which were mainly obtained by less direct methods. The importance of the electron–hole interaction in radiative processes in ZnSe is emphasised.