Abstract

The spectral transfer function of a monochromator is defined as the Fourier transform of the monochromator slit function, in analogy with the optical transfer function of nondispersing optical systems. Because the spectral transfer function corresponding to a triangular slit function has secondary maxima, spurious spectral resolution can occur. That is, contrast in a periodic spectrum, which is lost when the slits of the monochromator are widened sufficiently, can return with further widening of the slits. The effect is demonstrated experimentally in the infrared rotation–vibration bands of carbon monoxide, carbon dioxide, and methane and the interference fringes of a Fabry–Perot etalon and a silver chloride plate.

© 1965 Optical Society of America

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