Abstract
Abstract The factors that determine the resolution of monochromators operating in both the non‐diffraction‐limited and diffraction‐limited modes are discussed. The instrument line shape function of a monochromator (often called the spectral slit function) operating above the diffraction limit is a triangle, whereas in the diffraction‐limited case it is sinc 2 ([sin x ] 2 / x 2 ) function. For Fourier transform infrared (FT‐IR) spectrometers, the instrument line shape function is a sinc ([sin x ]/ x ) function unless the interferogram is multiplied by an apodization function. In this case, the instrument line shape function is the Fourier transform of the apodization function. Common apodization functions that are discussed include the triangular function and the three Norton–Beer functions. The effect of a diverging (noncollimated) beam, passing through the interferometer of a FT‐IR spectrometer, on the resolution and instrument line shape function is discussed at the end of the article.
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