COMB-LIKE INSTRUMENTAL FUNCTIONS IN HIGH-RESOLUTION SPECTROSCOPY

A new method for the spectral analysis of radiation, based on the use of spectrometers with complicated instrumental functions (e.g., a comb like function representing a sum of several narrow peaks shifted relat ive to each other) is considered. The new method was adopted for a spe ctrometer comprising a scanning Fabry-Perot interferometer and a grati ng monochromator with equal scanning speeds. The data processing is ba sed on solving a convolution equation with the aid of a RECOVERY signa l restoration program package reported earlier. The efficiency of the method is demonstrated by measurements of the photoluminescence spectr a of excitons bound on the radiation defects in single-crystal silicon grown by floating zone technique in an argon and an argon-hydrogen at mosphere. It is shown that the spectrometer provides good restoration of the spectral density of studied radiation and has a markedly wider working range, a higher signal to noise ratio, and better spectral res olution as compared to those of the narrow-band Fabry-Perot interferom eter. The new method can be efficiently employed in high-resolution sp ectroscopy of any type, including optical, X-ray, neutron, etc.