A Manual Rectangular KBr Pellet Press

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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.

Keywords: Infrared analysis; Rectangular pellet press; Spectroscopic technique

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370271779950409

Affiliations: Department of Chemistry, Kansas State University, Manhattan, Kansas 66502

Publication date: September 1, 1971

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