What is exciton oscillator strength?
What is exciton oscillator strength? Therefore, for large excitons in direct-gap crystals the oscillator strength of exciton absorption is proportional to which is the value of the square of the wave function of the internal motion inside the exciton at coinciding values of the electron and hole coordinates. Can oscillator strength be greater than 1? Yes we have done absorption for oligothiophene molecule. We have used long range corrected functionals like CAM-B3LYP and wB97X-D. Still we observed same oscillator strengths (more than one) as like other functionals B3LYP and M06. f values > 1 occur especially on highly symmetric molecules...