The Absorption Behavior of Water and Some Organic Liquids in the Near Infrared Studied by Photoacoustic Spectroscopy

Haas, U.; Seiler, H.

doi:10.1515/zna-1984-1217

Cited by 6 publications

(2 citation statements)

References 11 publications

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“…800nm with an EG & G, Princeton Applied Research Model 6001 photoacoustic spectrometer, as described elsewhere. 29 The samples were investigated at normal pressure and room temperature (293 K).…”

Section: Methodsmentioning

confidence: 99%

Small metallic particles studied by optical and electron-optical spectroscopy

Seiler¹,

Haas²,

Ocker³

et al. 1991

Faraday Discuss.

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Electron energy loss spectroscopy (EELS) in a transmission electron microscope (TEM) and photoacoustic spectroscopy (PAS) has been used to study the electronic structure of small Ag, In and Au particles, deposited on thin carbon foils, quartz supports or as self-supporting layers, respectively.In the low energy-loss region the EELS spectra of Ag particles with diameters of ca. 50 nm are different from the spectra of the homogeneous Ag layers, mainly owing to the influence of the carbon foil. By decreasing the packing density of the Ag particles, a shift of the plasma losses to lower energies is observed in the energy region 10eV. The optical behaviour of homogeneous metallic and small particle layers on thin quartz supports was studied by PAS in the ultraviolet/visible (UV/VIS) spectral region. The homogeneous layers, e.g. of Ag, show, in the UV range, the well known change of reflectance due to an interband transition of bare silver. For Ag particle layers surface plasma resonances are excited. With increasing packing density of the particles the absorption peak observed is red-shifted and becomes broader, whereas the results of EELS in the low energy-loss region revealed a shift to higher energies.To obtain additional information investigations of In and Au particles were performed.

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Section: Methodsmentioning

confidence: 99%

Small metallic particles studied by optical and electron-optical spectroscopy

Seiler¹,

Haas²,

Ocker³

et al. 1991

Faraday Discuss.

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“…The basic technique [1,2] utilized sealed cells and conventional light sources with mechanical chopping to modulate incident light which, via optical absorption and resultant heating, caused detectable bulk expansion of the sample. The technique subsequently found wider application with the availability of xenon arc lamps for the study of organometallic compounds [3], organic liquids [4] and rare earth oxides [5]. Argon lasers have been used to study analytes in liquids; sensitivities of parts per trillion have been reported [6] but the spectroscopy was restricted by the limited wavelength tuneability.…”

Section: Photoacoustic Spectroscopymentioning

confidence: 99%

A pulsed photoacoustic system for the spectroscopy and monitoring of hydrocarbon liquids using stimulated Raman scattering in a silica fibre as a near-infrared source

Hannigan

Greig²,

Freeborn³

et al. 1999

Meas. Sci. Technol.

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Raman scattering in an optical fibre has been utilized as the near-infrared source for a pulsed photoacoustic spectroscopic study of liquid hydrocarbons. An open-cell system is described and the performance criteria for practical photoacoustic instrumentation are discussed. Results show that a typical signal-to-noise ratio of 50 may be achieved, which makes this system suitable for the detection of small concentrations of hydrocarbons in liquids. The photoacoustic system has been used to measure concentrations both of dissolved and of dispersed hydrocarbons and the results of this study indicate the practical potential for novel open-cell photoacoustic instrumentation for the detection of crude oil in water using near-infrared wavelengths in a spectral region for which suitable diode lasers are available.

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