Infrared reflectance spectra

Lucovsky G, White RM, Benda JA, ReveUi JE (1973) Infrared-reflectance spectra of layered Group-IV and Group-VI transition-metal dichalcogenides. Phys Rev B 7 3859-3870 Cordes H, Schmid-Fetzer R (1994) Phase equilibria in the U-Te system. J AUoy Compd 216 197-206... 

These conclusions from the infrared reflectance spectra recorded with Pt and Pt-Ru bulk alloys were confirmed in electrocatalysis studies on small bimetallic particles dispersed on high surface area carbon powders.Concerning the structure of bimetallic Pt-Ru particles, in situ Extended X-Ray Absorption Fine Structure (EXAFS>XANES experiments showed that the particle is a true alloy. For practical application, it is very important to determine the optimum composition of the R-Ru alloys. Even if there are still some discrepancies, several recent studies have concluded that an optimum composition about 15 to 20 at.% in ruthenium gives the best results for the oxidation of methanol. This composition is different from that for the oxidation of dissolved CO (about 50 at.% Ru), confirming a different spatial distribution of the adsorbed species. 

W.R. Hruschka, Data analysis wavelength selection methods, pp. 35-55 in P.C. Williams and K. Norris, eds. Near-infrared Reflectance Spectroscopy. Am. Cereal Assoc., St. Paul MI, 1987. P. Geladi, D. McDougall and H. Martens, Linearization and scatter-correction for near-infrared reflectance spectra of meat. Appl. Spectrosc., 39 (1985) 491-500. 

The analysis of near infrared reflectance spectra of foods. 

P. Geladi, D. MacDougall and H. Martens, Linearization and scatter correction for near-infrared reflectance spectra of meat, Appl. Spectrosc., 39, 491 (1985). 

N.B. Gallagher, T.A. Blake, P.L. Gassman, Application of extended inverse scatter correction to mid-infrared reflectance spectra of soil, J. Chemom., 19, 271 (2005). 

P.J. Gemperline and L.D. Webber, Raw materials testing using soft independent modeling of class analogy analysis of near infrared reflectance spectra, Anal. Chem., 61, 138-144 (1989). 

Y. Woo, H. Kim and J. Cho, Identification of herbal medicines nsing pattern recognition techniques with near-infrared reflectance spectra, Microchem. J., 63, 61-70 (1999). 

Besides the peaks of the local proton modes typical for hydrogen bond, a sharp peak at 28 meV was observed in KDP [34] and attracted much attention [34,38,39]. This peak exists in DKDP at somewhat higher frequency its intensity decreases in both crystals and its width decreases upon the transition from the FE to the PE phase, without any softening of its frequency [38]. Hence, it is concluded that this mode is connected with the phase transition dynamics, i.e., coupled to the polarization fluctuations. This mode is not the tunneling mode or any local mode of proton or deuteron, but rather some collective optical mode of the lattice that involves substantial proton or deuteron displacement. It has been suggested [38] that this mode corresponds to the mode that has a peak at about 200 cm (25 meV) in Raman scattering and infrared reflectivity spectra, and that it is coupled to the soft mode and usually... 

Figure 3.23. Near-infrared reflectance spectra with second-derivative preprocessing before (a) and after (b) region selection. 

Figure 4.18, Near-infrared reflectance spectra of the 29 recycle plastic containers, baseline corrected at 1600 nm.

Figure 3.2. Second derivative near-infrared reflectance spectra of recycle polyethylene containers before (a) and after b) normalization to unit area.

Infrared Reflectance Spectra of Cu-TCNQ Semiconducting Films... 

To investigate the formal charge of TCNQ in the semiconducting films of Cu-TCNQ, the infrared reflectance spectra was recorded at room temperature for crystalline Cu-TCNQ films before and after an external electric field was applied to the sample. 

The infrared reflection spectra of liquid Si02 has also been studied up to 2000°C (4%)- The room temperature 1120 cm 1 band of vitreous Si02 was found to have shifted to 1054 cm 1 at 2000°C and with greatly reduced intensity. No direct interpretation was made. 

Figure 13.6 In situ infrared reflectance spectra of polyaniline-modified electrodes in solution containing 0.10 M HC1. Spectra collected at applied potentials indicated at right of curves, and normalized according to Eq. 13.12 using R0 collected at -0.1 V. Potentials measured against saturated calomel electrode. [From Ref. 54.]...

NIR spectra are acquired using dried tissue, either whole or ground. The reflectance is measured relative to a so-called white reference, which is a highly reflective surface, such as Gore-Tex or white ceramic. Near-infrared reflectance spectra, or absorbance spectra, defined as log(l/R), with R being the reflectance, look rather flat. For analysis purposes the second derivative of the spectra is often used, because it enhances certain spectral features. 

Figure 10 Near-infrared reflectance spectra of intermediate products at four times in the same run.

Geladi, P., MacDougall, D. and Martens, H., Linearization and Scatter Correction for Near-Infrared Reflectance Spectra of Meat Appl. Spectrosc. 1985, 39, 491-500. 

Shah, N.K. and Gemperline, P.J. (1990) Combination of the Mahalanobis distance and residual variance pattern recognition techniques for classification of near-infrared reflectance spectra Anal. Chem. 62, 465-470. 

Murray, I, Aucott, L. S. and Pike, I. H. (2001) Use of discriminant analysis on visible and near infrared reflectance spectra to detect adulteration of fish meal with meat and bone meal. 

The aim of this article is to show that the new quasi-two-dimensional organic conductor p -(BEDO-TTF)5[CsHg(SCN)4]2 [hereafter called (BEDO)CsHg] (BEDO-TTF - bis-(ethylenedioxy)tetrathiafulvalene) which contains closed and open orbits displays rather complicated oscillatory spectra associated with magnetic breakdown (MB) and quantum interference (QI) effects. Tight binding band structure calculations for this compound are proposed to characterise its Fermi surface. The aim of the article includes also an investigation of the optical conductivity anisotropy with polarized infrared reflectance spectra. 

The electron-phonon interaction has been studied also in a LiTnJA crystal by Kupchikov et al. (1982). They have measured Raman and infrared reflection spectra under pressures up to 1.2 GPa and at temperatures ranging from 4.2 K to 300 K. The interaction of optical phonons with electronic excitations in this system of rare-earth ions was detected by anomalous tem-... 

The considerable electrical anisotropy of this salt is made still more evident on the room-temperature polarized infrared reflection spectra [30] (see also Chapter 6 and Fig. 1 of this chapter). In addition, these reflection spectra give a remarkably clear information on the existence of strong coupling between the quasi-one-dimensional electronic system and the symmetric ag vibrational modes of the TCNQ molecules. More precisely, under the effect of this coupling, these particular modes, which are normally Raman active but infrared nonactive, acquire an anomalous intense infrared activity together with an anomalous polarization [20,30,31]. 

Figure 11. Infrared reflectance spectra (EMIRS) of the adsorbed species resulting from the chemisorption of methanol on a platinum polycrystalline electrode in acid medium (10 M CH3OH in 0.5 M HCIO4, room temperature).

FIGURE 22.5 Infrared reflectivity spectra of (Pbo5Cao5)(Fco5Tao5)03 specimen sintered at 1250°C for 30 min. 

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