Abstract
The absorbance for a given quantity of a compound in spectroscopic analysis is absolute and depends only on the fraction of that quantity which interacts with the electromagnetic radiation. Also, to maximize the signal-to-noise (S/N) ratio the total optical power of the spectrophotometer should be allowed to interact with the sample. Since the design of the monochromator is normally based on line-shaped entrance and exit slits, the optimum geometry for a sample pellet would be a rectangle of dimensions comparable to the entrance slit. Circular pellets which cover the entire slit keep part of the sample outside the beam; when the pellet diameter is made comparable to the slitwidth, excessive vignetting will occur which will adversely affect the S/N ratio.
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References
L. A. Bauman, Jr., Appl. Spectrose. 23, 282 (1969).
W. J. de Klein and K. Ulbert, Anal. Chem. 41, 682 (1969).
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© 1974 Springer Science+Business Media New York
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van Swaay, M., Winkler, E.M. (1974). A Manual Rectangular KBr Pellet Press. In: May, L. (eds) Spectroscopic Tricks. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-2742-4_27
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DOI: https://doi.org/10.1007/978-1-4684-2742-4_27
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4684-2744-8
Online ISBN: 978-1-4684-2742-4
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