DRIFT diffuse-reflection Fourier-transform

Because chemical and structural properties of natural and artificial gems are very similar in this case, the possibilities of Raman and LIBS methods are rather limited. It was found that another laser-based techniques could be very effective for rapid spectroscopic discrimination between natural and synthetic emeralds, rubies, and alexandrite (Armstrong et al. 2000a,b). The first one is DRIFTS (Diffuse Reflectance Fourier Transformed Infra-Red Spectroscopy)... [Pg.320]

DRIFT diffuse reflection Fourier-transform infrared spectroscopy... [Pg.176]

The introduction of Fourier Transform Infrared Spectroscopy (FTIR) brought along a number of typical solid sample techniques. DRIFTS (Diffuse Reflectance Fourier Transform Infrared Spectroscopy) is probably most commonly known. Another technique, developed specifically for measuring solid, opaque samples is PAS (Photo Acoustic Spectroscopy). This accessory is less known, probably due to its high cost and its rather difficult modus operandi. [Pg.491]

In this contribution, the steady-state isotopic transient kinetic analysis-diffuse reflectance Fourier transform spectroscopy (SSITKA-DRIFTS) method provides further support to the conclusion that not only are infrared active formates likely intermediates in the water-gas shift (WGS) reaction, in agreement with the mechanism proposed by Shido and Iwasawa for Rh/ceria, but designing catalysts based on formate C-H bond weakening can lead to significantly higher... [Pg.365]

CE European certification DRIFT-IR diffuse reflectance Fourier-transform... [Pg.581]

F. Diffuse-Reflection (Fourier-Transform) Infrared Spectroscopy (DRIFTS) (18)... [Pg.6]

More realistic and complex tlieories consistent with the quite complex nature of the phenomena involved in the DR of light were developed later. Experimental studies have shown that this technique is affected by particle size, granulometric distribution and the refractive index of the particles, which has an important role when the particle size is near the wavelength of the 1R radiation. Diffuse reflectance Fourier transform (DRIFT) studies in the FIR region allow detection of the skeletal spectra of materials, such as mixed oxide catalysts, pigments and metal halides. [Pg.105]

Ostmeyer JG, Elder TJ, Winandy JE (1989) Spectroscopic analysis of southern pine treated with chromated copper arsenate II. Diffuse-reflectance Fourier-transform infrared spectroscopy (DRIFT). J Wood Chem Technol 9 105-122 Owen NL, Thomas DW (1989) Infrared studies of hard and soft" woods. Appl Spectrosc 43 451-455... [Pg.69]

The disadvantages of conventional IRS, like the need to compress the samples, is overcome when the diffuse reflectance Fourier transform (DRIFT) technique is used, whereby a few milligrams of the compound is dispersed in approximately 250 mg of KBr, and the spectrum is obtained by reflection from the surface. [Pg.222]

Experimentally, IR spectroscopy can be accomplished in a number of ways by Nujol mull, KBr disc or the diffuse reflectance technique. In the KBr disc technique, the compound is mixed with KBr and compressed into a disc using a press and die. This can be a disadvantage if the compound undergoes a polymorphic transformation under pressure (see Chan and Doelker, 1985). One way to overcome this problem is to use the diffuse reflectance Fourier transform (DRIFT) technique, whereby a few milligrams of compound is dispersed in approximately 250 mg of KBr and the spectrum obtained by reflection from the surface. [Pg.73]

Discussions of old and new techniques used to study the surface of silica, including diffuse reflectance Fourier transform (DRIFT) infrared spectroscopy, 29Si cross polarization magic-angle nuclear magnetic resonance (CP MAS NMR) spectroscopy, as pioneered by Maciel and Sindorf... [Pg.34]

The samples were characterized by X-ray diffraction (XRD) transmission and high-resolution electron microscopy (TEM and HREM) microelectrophoresis X-ray photoelectron spectroscopy (XPS), also known as electron spectroscopy for chemical analysis (ESCA) secondary ion mass spectrometry (SIMS) and diffuse reflectance Fourier transform (DRIFT) infrared absorption spectroscopy. [Pg.544]

Diffuse Reflectance Fourier Transform Infrared Spectroscopy (DRIFT)... [Pg.114]

Both chemical and physical processes take place during calcination and activation. Ligand decomposition from the metal complex can be monitored with in situ vibrational spectroscopy, for example, using diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS). In the case of a transition metal ion, the metal oxidation state can be tracked as a function of time and temperature using in situ UV-vis spectroscopy. Finally, the formation of metal clusters and nanoparticles can be monitored using XRD, similar to that described for the synthesis of silicalite-1. [Pg.377]

Deposition of analytes in solvent-elimination LC-FTIR is performed on powdered substrates, mirrors, or IR-transparent windows. Correspondingly, diffuse reflection Fourier-transform infrared (DRIFT) detection, reflection-absorption (R-A) spectroscopy, or transmission measurements are applied to investigate the analyte deposits. [Pg.2653]

The second group of techniques are the spectroscopic techniques that provide elemental and chemical analysis. These are diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS), XPS, and SIMS. XPS and SIMS probe the first few nanometres of the surface whereas DRIFTS probes an order of magnitude deeper. These techniques are discussed in Section 3.5. [Pg.108]

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