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Theory of the photoacoustic effect with solids
Allan Rosencwaig,Allen Gersho +1 more
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TLDR
In this article, a quantitative derivation for the acoustic signal in a photoacoustic cell in terms of the optical, thermal, and geometric parameters of the system is presented. And the theory predicts the dependence of the signal on the absorption coefficient of the solid, thereby giving a theoretical foundation for the technique of photoacoustical spectroscopy.Abstract:
When chopped light impinges on a solid in an enclosed cell, an acoustic signal is produced within the cell. This effect is the basis of a new spectroscopic technique for the study of solid and semisolid matter. A quantitative derivation is presented for the acoustic signal in a photoacoustic cell in terms of the optical, thermal, and geometric parameters of the system. The theory predicts the dependence of the signal on the absorption coefficient of the solid, thereby giving a theoretical foundation for the technique of photoacoustic spectroscopy. In particular, the theory accounts for the experimental observation that with this technique optical absorption spectra can be obtained for materials that are optically opaque.read more
Citations
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Condensed phase photoacoustic spectroscopic detection of porphyrins and dyes
TL;DR: In this article, a simple piezoelectric detection system suitable for performing highly sensitive liquid-phase photoacoustic spectroscopy is presented, and performance of the system with respect to linearity, solvent effects, and excitation pulse characteristics is experimentally evaluated and compared with theoretical figures of merit.
Journal ArticleDOI
Optical absorption, photosensitization, and ultrafast carrier dynamic investigations of CdSe quantum dots grafted onto nanostructured SnO2 electrode and fluorine-doped tin oxide (FTO) glass
TL;DR: In this paper, the growth rate of CdSe quantum dots depends on the morphology of the substrate and the ultrafast carrier dynamics of the quantum dots are studied using a transient grating technique.
Journal ArticleDOI
Self-normalized photothermal technique for accurate thermal diffusivity measurements in thin metal layers
TL;DR: In this article, a self-normalized photothermal method for measuring thermal diffusivity of thin metal layers has been implemented using two experimental configurations based on photothermal radiometry and gas-cell photoacoustic detection.
Journal ArticleDOI
Visible‐light spectroscopy by photothermal radiometry using an incoherent source
TL;DR: In this paper, photothermal radiometry (PTR) was used to yield optical absorption spectra in the visible region of untreated and strongly scattering material, using Nd2O3 powder, blood, and a green leaf as test samples.
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Optical Absorption, Photoelectrochemical, and Ultrafast Carrier Dynamic Investigations of TiO2 Electrodes Composed of Nanotubes and Nanowires Sensitized with CdSe Quantum Dots
TL;DR: In this article, the ultrafast carrier dynamics of CdSe-sensitized TiO2 electrodes composed of nanotubes and nanowires is studied using a lens-free heterodyne detection transient grating (LF-HD-TG) technique.
References
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Journal ArticleDOI
LXVIII. Upon the production of sound by radiant energy
TL;DR: The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science: Vol. 11, No. 71, pp. 510-528 as mentioned in this paper discusses the production of sound by radiant energy.
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Photoacoustic spectroscopy of solids
TL;DR: In this article, the opto- or photo-acoustic effect used in gas analysis has been extended to the study of solids, providing a simple method for obtaining information about optical absorptions and subsequent de-excitations in solids.
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Photoacoustic spectroscopy of biological materials.
TL;DR: In this paper, a new technique for performing optical spectroscopy on solids has been developed Photoacoustic spectra of cytochrome c and hemoglobin show how this technique can be used to obtain information about optical absorptions and subsequent deexcitations in solid biological materials, particularly those which cannot readily be studied by conventional means.