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.

Sulfuric acid in KBr pellet spectroscopy

Frederic E. Volz
Appl. Opt. 18(14) 2353-2354 (1979)

Alteration of the Muscovite Absorption Spectrum by KBr Pellet Preparation

Stanley Ruthberg, Mary W. Barnes, and Ralph H. Noyce
Appl. Opt. 2(2) 177-177 (1963)

Method to derive the infrared complex refractive indices n(λ) and k(λ) for organic solids from KBr pellet absorption measurements

Kelly A. Peterson, Ryan M. Francis, Catherine A. Banach, Ashley M. Bradley, Sarah D. Burton, Jeremy D. Erickson, Schuyler P. Lockwood, Karissa L. Jensen, Michael O. Yokosuk, Timothy J. Johnson, and Tanya L. Myers
Appl. Opt. 63(6) 1553-1565 (2024)

Measuring the Transmittance of Atmospheric Dust in KBr Pellets Using a CO₂ Laser

Kenneth O. White and James D. Lindberg
Appl. Opt. 12(11) 2544-2545 (1973)

A Study of the Applicability of the Pressed Pellet Electrode Method to the Spectrographic Analysis of Nickel Alloys*

C. J. Neuhaus
J. Opt. Soc. Am. 33(3) 167-174 (1943)