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Applied Optics

Applied Optics


  • Vol. 15, Iss. 11 — Nov. 1, 1976
  • pp: 2658–2663

Photoacoustic spectroscopy with condensed samples

John F. McClelland and Richard N. Kniseley  »View Author Affiliations

Applied Optics, Vol. 15, Issue 11, pp. 2658-2663 (1976)

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A discussion of the photoacoustic spectroscopy of condensed matter is presented with emphasis on the role of the sample and the sample cell in the photoacoustic signal waveform. The spectrometer and sample cell are described, and an experimental evaluation of the system performance is given. Data on various samples are reported, and sample geometry, signal saturation, and scattered light effects are analyzed. The relationship between photoacoustic spectra and absorption and reflection spectra is developed.

© 1976 Optical Society of America

Original Manuscript: February 19, 1976
Published: November 1, 1976

John F. McClelland and Richard N. Kniseley, "Photoacoustic spectroscopy with condensed samples," Appl. Opt. 15, 2658-2663 (1976)

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  9. The cell does not completely isolate the microphone from acoustical excitation originating outside the cell. The microphone o-ring seal can allow vibrations from the cable and preamplifier to be conducted into the cell unless care is taken to secure and isolate these components. In addition the microphone may pick up sound generated by the slotted chopper blades which often have resonances, especially at high chopping frequencies. This problem can often be controlled by using higher slot count blades at lower angular velocity or by using a solid transparent disk with an opaque chopping pattern.
  10. Recently significantly higher efficiency has been reported by Parker in Ref. 11 for the conversion of absorbed beam power to signal by using He or H2 as the coupling gas.
  11. J. G. Parker, Anal. Chem. 47, 1189A (1975).
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  13. S. A. Schleusener, J. O. Lindberg, K. O. White, Appl. Opt. 14, 2564 (1975). [CrossRef] [PubMed]
  14. H. S. Bennett, R. A. Forman, Appl. Opt. 14, 3031 (1975); Appl. Opt. 15, 347 (1976). [CrossRef] [PubMed]
  15. J. F. McClelland, R. N. Kniseley, Appl. Phys. Lett. 28, 467 (1976). [CrossRef]
  16. Under the assumptions described, the power through a plane perpendicular to the beam is proportional to exp(−βl) at any value of l in the sample. The power absorbed in a layer dl is proportional to {exp(−βl) − exp[−β(l + dl)]} ≃ [exp(−βl) − exp(−βl) (1 − βdl + …)] = βdl exp(−βl). Hence the heat energy developed before conduction per unit time and length is proportional to β exp(−βl).
  17. H. S. Carslaw, J. C. Jaeger, Conduction of Heat in Solids (Oxford U. P., London, 1959).
  18. The sample’s thermal diffusivity α is related to the thermal conductivity k, density ρ, and specific heat C by α = k/ρC.

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