Experimental Resolution and Brand Profile in F.T.-I.R. Spectroscopy

The minimum possible number of sampling points (N) to achieve rapid and accurate scan and the best I.R.-F.T. spectra in terms of resolution, height (H) half height band width (HH) are discussed. The experimental resolution, for a particular number of data points, was measured from the distance of any newly evolved peak from its closest neighbor when increasing N in a water vapour interferogram; the experimental curve is close to the theoretical one. H and HH of any peak are found to increase and decrease respectively when the optical path is enlarged up to a certain limit and thereafter, they become almost constant. Taking informations with further values of N merely adds noise with no sign of improvement in the spectra.