Reflection infrared spectra

Figure 3. Reflection infrared spectra (ATR-IR) of a polypropylene-j surface before (A) and after (B) grafting with acrylamide (AM) by the vapor phase process (above). ESCA spectra of the same surface before (dotted lines) and after (full lines) the surface grafting (below).

NO reactions, 383-384 oxidation products, identification, 376-377 SF reactions, 381 S02 reactions, 378,381 Polypropylene films, reflection infrared spectra, 179/... 

Figure 2. Reflection infrared spectra of thiophene films (a) thiophene adsorbed on Ni(111) at 170 K (b) thiophene adsorbed on Ni(111) at 170 K heated to 320 K (c) electrochemically grown poly(thiophene) on Pt...

Figure 4. Reflection infrared spectra of aniline films (a) aniline multilayer adsorbed on Ni(111) at 165 K (b) poly(aniline) monolayer on Ni(111) at 400 K (c) electrochemically grown poly(aniline) on Pt oxidized at 0.8 V vs. Ag/AgCI(1M) (d) electrochemically grown poly(aniline) on Pt reduced at 0.35 V vs. Ag/AgCI(1M) (e) electrochemically grown poly(aniline) on Pt reduced at 0.0 V vs. Ag/AgCI(1M)...

Diffuse reflectance infrared spectra were acquired for the sorbitol samples. As shown in Figure 7, identical IR spectra were observed for all materials. The IR spectral band assignments are presented in Table 9, and the measured absorbance bands are consistent with the structure of sorbitol. 

Fig. 8.8 Diffuse reflectance infrared spectra of an MgO-supported mononuclear gold compound, dimethyl gold acetyl acetonate, along with spectra of several reference compounds in the O—H and C—H stretch and the fingerprint region. Detailed assignments are shown in Table 8.3. (Adapted from [29]).

Internal reflection infrared spectra measured in situ during etching of silicon in HF solutions exhibit characteristic Si - H modes, although the Si - H spectrum is broad because of interaction of the surface Si-H groups with the electrolyte. No electrochemical or chemical intermediate species have been detected [112]. Infrared spectra of porous silicon layers after drying reveal characteristic Si-H and Si-H2 peaks similar to the spectra obtained for hydrogen on Si(lOO) 2x1 surfaces [112]. 

Isolation of two trimeric compounds with lactone ring. Holzforschung 35 183-187 Yeboah SA, Wang S-H, Griffiths PR (1984) Effect of pressure on diffuse reflectance infrared spectra of compressed powders. Appl Spectrosc 38 259-264 Zavarin E, Nguyen C, Romero E (1982) Preparation of enzymatically liberated lignin from naturally brown-rotted wood. J Wood Chem Technol 2 343-37... 

Brimmer, P.J. Griffiths, P.R. Harrick, N.J. Angular dependence of diffuse reflectance infrared spectra. I. FT-IR spec-trogoniophotometer. Appl. Spectrosc. 1986, 40, 258-265. 

Boolaamphiphiles with two reactive head groups at both ends may bind in a linear or bent fashion to metal surfaces. The only example of a folded bolaamphiphiles on solid surfaces is provided by HOOC—(CH2)3o—COOH on silver. Ellipsometry yielded a surface film thickness of 20 2 A. In the reflection infrared spectra, the 2928 cm shoulder, as well as the lack of sharp bands between 1150 and 1350 cm for the progression of wagging modes indicated that the all-trans sequence length in the surface film should be much less than for the fully extended chain in the KBr pressed disk sample (Figure 6.23) . 

Since the interaction of tt)-epoxysiIanes with oxide surfaces at elevated temperatures exclusively leads to the loss of the epoxy fiinction, additional silylation experiments were carried out under ambient conditions. Fig.4 shows some diffuse reflectance infrared spectra of the silica material In all cases, an additional absorption band around 3046 cm characteristic of the intact oxirane fragment is detected. 

In view of the discussed above discrepancies, some spectroscopic evidence of particular surface species used in the MUSIC model would be much desired. Connor et al. [51] studied internal reflection infrared spectra of Ti02 (amorphous + anatase) films, and obtained the following speciation. The (=Ti)20H species is formed at pH < 4.3, and =TiOH2 at pH < 5. The =TiOH species was detected at pH 4.3-10.7 (maximum abundance at pH 8) and =TiOH2 species at pH < 10.7. 

Attenuated total reflectance Infrared spectra were obtained on the oriented polystyrene sample (Figure 1) and on the two SMA copolymers selected for investigation (Figure 2,3). 

Nanzyo, M., Diffuse reflectance infrared spectra of phosphate sorbed on alumina gel, J. Soil Sci., 35, 63, 1984. 

T emperature-programmed desorption (TPD) of ammonia and infrared spectroscopy (IR) of adsorbed pyridine are probably the most extensively used methods for characterising acidity (number, strength and nature of acid sites) in zeolites [17,18]. Fig. 1 shows the diffuse-reflectance infrared spectra of pyridine adsorbed on H-Y, H-Y(d5o%) and H-Y(d64%) samples at... 

Figure 2. Transmission and diffuse reflectance Infrared spectra of a clear melamine formaldehyde crossllnked acrylic copolymer coating.

Fig. 47. Diffuse reflectance infrared spectra (DRIFT) of hydrogen adsorbed on H-ZSM-5 at 77 K a, b, c after heat-pretreatment in high vacuum at 770,970 and 1220 K, respectively spectrum d after deep-bed treatment at 770 K abscissa linear in wavelength important bands indicated by wavenumbers in cm" (adopted from [713])...

Diffuse reflectance, infrared, spectra of H-ZSM-5 (after Kazansky et a(. 1965) (41). 

Ghosh, S. N., Chatterjee, A. K "Absorption and reflection infrared spectra of major cement minerals, ckinkers and cements" Journal of Materials Science 9(10) 1577-1584,1974. 

G. Janatsch, J.D. Kruse-Jarres, R. Marbach, H.M. Heise, Multivariate CaUbration for Assays in Clinical Chemistry using Attenuated Total Reflection Infrared Spectra of Human Blood Plasma , Anal. Chem., 61, 2016-2023 (1989). 

Diaz, G., R.E. Clavijo, M.M. Campos-VaUette, M. Saavedra, S. Diez, L. Lopez, and R. Munoz (1997). Specular reflectance infrared spectra of the macrocycles cyclam and cyclamdione and their Cu(II) complexes deposited onto a smooth copper surface. Vib. Spectrosc. 15, 201. 

Figure 8.6 Diffuse reflectance infrared spectra of (a) form I and (b) form II of cortisone acetate [4]. Reprinted from Spectrochim. Acta, 47A, Deeley, C. M., Spragg, R. A. and Threlfall, T. L., A comparison of Fourier transform infrared and near-infrared Fourier transform Raman spectroscopy for quantitative measurements an application in polymorphism , 1217-1223, Copyright (1991), with permission from Elsevier.

Figure 8.9 Carbonyl regions of the diffuse reflectance infrared spectra of two polymorphs of an anti-inflammatory drug (a) pol3miorph I (b) polymorph II (cf. SAQ 8.2) [5]. Reprinted from J. Pharmaceut. Biomed. Anal, 11, Roston, D. A., Walters, M. C., Rhinebarger, R. R. and Foto, L. J., Characterization of polymorphs of a new antiinflammatory drug , 293-300, Cop3night (1993), with permission from Elsevier.

Figure 10 External reflection infrared spectra of behenic acid methyl ester monolayers on water, measured with s-polarized and p-polarized light at different incidence angles. (Reprinted with permission from Flach CR, Gericke A, and Mendelsohn R (1997) Quantitative determination of molecular chain tilt angles in mono-layer films at the air/water interface infrared reflection/absorption spectroscopy of behenic acid methyl ester. Journal of Physical Chemistry B101 58-65 American Chemical Society.)...

Fig. 8 Second derivative reflectance infrared spectra at source incidence angle 60° of thin films prepared using buffers from pH 4 to 7 and cast onto vapor deposited Al (a) Mb film (b) Mb-DMPC film (adapted from Ref. [33])...

Fig. 30. (Top) Surface pressure-area isotherms for poly(/6-benzyl-L-aspartate) films spread on water containing small concentrations of 2-propanol (1) 0 vol% (2) 0.4 vol% (3) 0.5 vol% (4) 0.85 vol% and (5) 1.0 vol%. (Bottom) External reflection infrared spectra obtained at 40 mN/m from these films.

Fig. 32. Scaled external reflectance infrared spectra of the Vas band for polydimethylsiloxane film spread on water at several concentrations between Fi and F2.

Figure 4.4 Internal reflectance infrared spectra of polymers (a) polypropylyene, (b) and (c) polyethylene terephthalate. Source Author s own files)...

When neither transmission nor reflection infrared spectra are satisfactory, spectra can generally be obtained by photoacoustic spectroscopy. The IR spectrum that is obtained is ratioed against an IR spectrum of carbon-black. PAS spectra resemble normal IR spectra with the same absorbance peak wavenumber locations as classic transmission spectra. Because the signal-to-noise ratio of PAS is very low, several thousand scans are needed to obtain a spectrum. The nature and interpretation of the spectra are markedly influenced by the thermal and acoustic properties of the sample. 

Boulet-Audet, M. et aL (2010) Quantitative determination of band distortions in diamond attenuated total reflectance infrared spectra. J. Phys. Chem. B, 114 (24), 8255-8261. 

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