Some Comments Concerning Quantitative Infrared Spectroscopy / Warren C. Steele, M. Kent Wilson
- Wilson, M. Kent
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- 1 online resource (5 pages) : illustrations, figures, tables
- Additional Creators:
- Steele, Warren C., American Society for Testing and Materials, and ASTM International
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- It is obvious to all consumers of infrared spectral data that the direct transference of quantitative intensities from one instrument to another would be a tremendous boon. It is equally clear that this transference is not possible at the present time . For many reasons it is convenient to use the extinction coefficients at band peaks in quantitative analyses, but these coefficients are strongly affected by experimental conditions¿̐ưnotably the finite slit width. Unfortunately, the method of calculating the ¿̐ưeffective¿̐ư slit width from the mechanical slit width has not been established [2,3]. Recently, Russell and Thompson  have concluded that the effective slit width employed must be less than one fifth of the band width at half-peak optical density if the band-peak extinction coefficients are to be obtained. This means for spectra in solution a slit width of 1 cm¿̐ư1 which is considerably less than that obtainable with standard prism spectrometers. It is not surprising, in view of the above comments, that spectra taken of the same substance with instruments of different optical design are not superposable. However, Copelin's results  clearly indicate that instruments of the same make operating presumably under identical conditions yield extinction coefficients that are alarmingly dissimilar. It has not yet been demonstrated whether this variation is due to inconsistencies in the slit width or to other variations in the instrument. The development of a dependable ¿̐ưstandard sample¿̐ư is a critical step in unraveling the instrument problem.
- Dates of Publication and/or Sequential Designation:
- Volume 1960, Issue 269 (January 1960)
- 9780803167179 (e-ISBN)
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- text file PDF
- Bibliography Note:
- Includes bibliographical references 9.
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- Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription.
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- Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 1960. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
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