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Spurious Radiation in Littrow-Mounted Grating Monochromators

Volume 22, Number 3 (June 1968) Page 198-199

Watanabe, A.


In this note we discuss two unusual types of "scattered" radiation that can occur in Littrow-mounted grating monochromators. Here, "scattered" radiation refers to diffracted radiation that reaches the exit slit by paths other than the one for which a monochromator was designed. Such spurious radiation usually will be out of focus at the exit slit and may not be noticeable in many applications. However, its presence can lead to serious error in the measurement of the absorption coefficient of a band, since the intensity at the exit slit for a particular grating angle will be the sum of the desired intensity at the correct wavelength and the spurious intensity at another wavelength.