Carbon as Reference for Normalizing Infrared Photoacoustic Spectra |
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Authors: | M. J. D. Low G. A. Parodi |
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Affiliation: | Department of Chemistry New York University 4 Washington Place New York , N. Y, 10003 |
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Abstract: | Photoacoustic spectra of solids1 are usually “source compensated,” i. e., normalized for differences in source emission at different wavelengths, and such compensation is done by comparing the photoacoustic spectrum of a sample to the emission spectrum of the source measured directly with, say, a photocell,2 power meter,3 or photodiode,4 or to the photoacoustic spectrum of “carbon” recorded under the same conditions as that of the sample. A variety of carbons has been used for this purpose, including carbon black on silica,5 soot from a gas torch,6 and acatylene-sooted bakelite,7 such a reference substance being assumed to be a flat black absorber. That assumption appears to be valid, as indicated by the close |
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Keywords: | Photoacoustic Spectroscopy Infrared Carbon Surface Species |
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