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

Peterson, Kelly A.; Francis, Ryan M.; Banach, Catherine A.; Bradley, Ashley M.; Burton, Sarah D.; Erickson, Jeremy D.; Lockwood, Schuyler P.; Jensen, Karissa L.; Yokosuk, Michael O.; Johnson, Timothy J.; Myers, Tanya L.

doi:10.1364/ao.514661

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

Journal Article · 13 February 2024 · Applied Optics

DOI: https://doi.org/10.1364/ao.514661 · OSTI ID:2323253

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^[1]; Banach, Catherine A. ^[1];

^[1]; Burton, Sarah D. ^[1];

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Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Obtaining the complex refractive index vectors n ( ν ~) and k ( ν ~) allows calculation of the (infrared) reflectance spectrum that is obtained from a solid in any of its many morphological forms. We report an adaptation to the KBr pellet technique using two gravimetric dilutions to derive quantitative n ( ν ~)/ k ( ν ~) for dozens of powders with greater repeatability. The optical constants of bisphenol A and sucrose are compared to those derived by other methods, particularly for powdered materials. The variability of the k values for bisphenol A was examined by 10 individual measurements, showing an average coefficient of variation for k peak heights of 5.6%. Though no established standards exist, the pellet-derived k peak values of bisphenol A differ by 11% and 31% from their single-angle- and ellipsometry-derived values, respectively. These values provide an initial estimate of the precision and accuracy of complex refractive indices that can be derived using this method. Limitations and advantages of the method are discussed, the salient advantage being a more rapid method to derive n / k for those species that do not readily form crystals or specular pellets.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 2323253

Alternate ID(s):: OSTI ID: 2301787

Report Number(s):: PNNL-SA-192634; TRN: US2409645

Journal Information:: Applied Optics, Vol. 63, Issue 6; ISSN 1559-128X

Publisher:: Optical Society of AmericaCopyright Statement

Country of Publication:: United States

Language:: English

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

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