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Applied Spectroscopy

Applied Spectroscopy

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  • Vol. 42, Iss. 2 — Feb. 1, 1988
  • pp: 289–292

Low-Frequency Photoacoustic Spectroscopy of Solids

J. C. Donini and K. H. Michaelian

Applied Spectroscopy, Vol. 42, Issue 2, pp. 289-292 (1988)


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Abstract

Research-quality far-infrared photoacoustic (PA) spectra are obtainable with a Fourier transform infrared spectrometer, the only changes with respect to conventional mid-infrared PA spectroscopy being the use of (1) a caesium iodide or polyethylene window on the PA cell, and (2) a mylar beamsplitter. Far-infrared PA spectra of several solids (bentonite, Fe+3-bentonite, and asbestos), in addition to the PA reference carbon black, have been recorded in this way. In order to improve signal-to-noise ratios in one of the spectra, we recorded ten interferograms under identical conditions; it was found that the average of the ten individually calculated spectra displays less noise and fewer spurious features than the spectrum obtained by first averaging the interferograms and then calculating a single spectrum. The results of this investigation demonstrate the feasibility of far-infrared PA spectroscopy, and illustrate that both experimental and computational procedures should be optimized in order to obtain the most satisfactory spectra.

Citation
J. C. Donini and K. H. Michaelian, "Low-Frequency Photoacoustic Spectroscopy of Solids," Appl. Spectrosc. 42, 289-292 (1988)
http://www.opticsinfobase.org/as/abstract.cfm?URI=as-42-2-289

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