ABSTRACT
In the “classical” dispersive spectrometer, the polychromatic light passes through the sample, which absorbs some wavelengths and transmits the rest. ›e transmitted light is then dispersed by a prism or grating before being detected. ›e resulting spectrum usually consists of downward absorption peaks, plotted against the wavelength or wave number. ›e wavenumber, which is the reciprocal of the wavelength, is expressed in reciprocal centimeters (cm−1).
