FOURIER CRITICAL-POINT ANALYSIS - EXTENSION TO GAUSSIAN LINESHAPES

The previous Fourier approach for the determination of critical point parameters is extended to Gaussian-broadened lineshapes. The type of broadening is easily recognized in reciprocal space because the variations of In C(n), where the C(n) are the amplitude coefficients, are linear and quadratic in the index n for Lorentzian and Gaussian broadenings, respectively. In an example application, the broadening mechanism of the E1 transition of CdTe is shown to be unequivocally Lorentzian.