Spectroscopy, photoacoustic

Photoacoustic Spectroscopy.—Photoacoustic spectroscopy (PAS) and its applications have been recently reviewed. A single-beam i.r. PAS spectrometer has been constructed for the range 800—4000 cm using a broad-band carbon rod spectral source in preference to a laser. A double-beam in-time PAS instrument has been described, in which a single microphone was used to monitor both the... [Pg.21]

Transient grating spectroscopy, photoacoustic spectroscopy and transient... [Pg.317]

This article provides some general remarks on detection requirements for FIA and related techniques and outlines the basic features of the most commonly used detection principles, including optical methods (namely, ultraviolet (UV)-visible spectrophotometry, spectrofluorimetry, chemiluminescence (CL), infrared (IR) spectroscopy, and atomic absorption/emission spectrometry) and electrochemical techniques such as potentiometry, amperometry, voltammetry, and stripping analysis methods. Very few flowing stream applications involve other detection techniques. In this respect, measurement of physical properties such as the refractive index, surface tension, and optical rotation, as well as the a-, //-, or y-emission of radionuclides, should be underlined. Piezoelectric quartz crystal detectors, thermal lens spectroscopy, photoacoustic spectroscopy, surface-enhanced Raman spectroscopy, and conductometric detection have also been coupled to flow systems, with notable advantages in terms of automation, precision, and sampling rate in comparison with the manual counterparts. [Pg.1275]

Characterization of Lignin. Lignin is characterized in the solid state by Fourier transform infrared (ftir) spectroscopy, uv microscopy, interference microscopy, cross polarization/magic angle spinning nuclear magnetic resonance (cp/mas nmr) spectroscopy, photoacoustic spectroscopy, Raman spectroscopy. [Pg.4241]

Other methods have also been developed but are harder to use routinely (higher size of the equipment, longer measurement time, higher cost, etc.). They will not be described here and the reader is referred to scientific literature for details. They include, for example, near-infirared [106], infrared [107], and optothermal infrared [108] spectroscopy, photoacoustic spectroscopy [109], as well as many other indirect methods taking advantage of the consequences of skin dehydration (D-Squame disk analysis, profilometry, viscoelastic properties of the skin, etc.). [Pg.498]

Applications Organic Chemistry Applications of Fluorescence Spectroscopy Photoacoustic Spectroscopy,... [Pg.31]

See also Environmental Applications of Electronic Spectroscopy IR Spectrometers Laser Applications in Electronic Spectroscopy Photoacoustic Spectroscopy, Theory Photoacoustic Spectroscopy, Applications Photoacoustic Spectroscopy, Methods and Instrumentation Surface Studies By IR Spectroscopy Zeeman and Stark Methods in Spectroscopy, Applications. [Pg.646]

See also ATR and Reflectance IR Spectroscopy, Applications Fourier Transformation and Sampling Theory IR Spectrometers IR Spectroscopy, Theory Matrix Isolation Studied By IR and Raman Spectroscopies Photoacoustic Spectroscopy, Applications Photoacoustic Spectroscopy, Theory Quantitative Analysis Surface Studies By IR Spectroscopy. [Pg.294]

Embrittlement, Engineering Alloys Inerared Spectroscopy Photoacoustic Spectroscopy Raman Spectroscopy Sureace Chemistry X-Ray Photoelectron Spectroscopy... [Pg.68]

Buschmann, C. (1990). Photoacoustic Spectroscopy—Photoacoustic and Photothermal Effects, In Modem Methods of Plant Analysis, New Series, Vol. 11, Springer-Verlag, Berlin. [Pg.406]

The temi action spectroscopy refers to those teclmiques that do not directly measure die absorption, but rather the consequence of photoabsorption. That is, there is some measurable change associated with the absorption process. There are several well known examples, such as photoionization spectroscopy [47], multi-photon ionization spectroscopy [48], photoacoustic spectroscopy [49], photoelectron spectroscopy [, 51], vibrational predissociation spectroscopy [ ] and optothemial spectroscopy [53, M]. These teclmiques have all been applied to vibrational spectroscopy, but only the last one will be discussed here. [Pg.1173]

Crippa P R, Vecii A and Viappiani C 1994 Time-resolved photoacoustic-spectroscopy—new developments of an old idea J. Photochem. Photobiol. B-Biol. 24 3-15... [Pg.1177]

Barrett J J and Berry M J 1979 Photoacoustic Raman spectroscopy (PARS) using cw laser sources Appl. Phys. Lett. 34 144-6... [Pg.1231]

Siebert D R, West G A and Barrett J J 1980 Gaseous trace analysis using pulsed photoacoustic Raman spectroscopy Appl. Opt. 19 53-60... [Pg.1231]

There have been a few other experimental set-ups developed for the IR characterization of surfaces. Photoacoustic (PAS), or, more generally, photothemial IR spectroscopy relies on temperature fluctuations caused by irradiating the sample with a modulated monocliromatic beam the acoustic pressure wave created in the gas layer adjacent to the solid by the adsorption of light is measured as a fiinction of photon wavelength... [Pg.1785]

INFRARED TECHNOLOGY AND RAMAN SPECTROSCOPY - INFRARED TECHNOLOGY] (Vol 14) Photoacoustic spectroscopy... [Pg.757]

Only slightly less accurate ( 0.3—0.5%) and more versatile in scale are other titration techniques. Plutonium maybe oxidized in aqueous solution to PuO " 2 using AgO, and then reduced to Pu" " by a known excess of Fe", which is back-titrated with Ce" ". Pu" " may be titrated complexometricaHy with EDTA and a colorimetric indicator such as Arsenazo(I), even in the presence of a large excess of UO " 2- Solution spectrophotometry (Figs. 4 and 5) can be utilized if the plutonium oxidation state is known or controlled. The spectrophotometric method is very sensitive if a colored complex such as Arsenazo(III) is used. Analytically usehil absorption maxima and molar absorption coefficients ( s) are given in Table 10. Laser photoacoustic spectroscopy has been developed for both elemental analysis and speciation (oxidation state) at concentrations of lO " — 10 M (118). Chemical extraction can also be used to enhance this technique. [Pg.200]

Several properties of the filler are important to the compounder (279). Properties that are frequentiy reported by fumed sihca manufacturers include the acidity of the filler, nitrogen adsorption, oil absorption, and particle size distribution (280,281). The adsorption techniques provide a measure of the surface area of the filler, whereas oil absorption is an indication of the stmcture of the filler (282). Measurement of the sdanol concentration is critical, and some techniques that are commonly used in the industry to estimate this parameter are the methyl red absorption and methanol wettabihty (273,274,277) tests. Other techniques include various spectroscopies, such as diffuse reflectance infrared spectroscopy (drift), inverse gas chromatography (igc), photoacoustic ir, nmr, Raman, and surface forces apparatus (277,283—290). [Pg.49]

A. Rosencwaig, Photoacoustics and Photoacoustic Spectroscopy, WRey-lnteiscience, New Yoik, 1980. [Pg.323]

Kim, J. 1., Stumpe, R., and Klenze, R. Laser-induced Photoacoustic Spectroscopy for the Speciation ofTransuranic Elements in Natural Aquatic Systems. 157,129-180 (1990). [Pg.148]

Poston, P. E., and Harris, J. M., Maximum Likelihood Quantitative Estimates for Peaks Application to Photoacoustic Spectroscopy, Anal. Chem. 59, 1987, 1620-1626. [Pg.412]

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