IR absorbance spectra

Figure 12 (a) Mid-IR absorbance spectra recorded from the thermal degradation of PMMA... 

Figure 15 IR absorbance spectra of PP films after ageing in air at 70°C (dashed curve) and after ageing at 70°C and re-processing (solid curve). Reprinted from Jansson et al. [42]. Copyright 2004, with permission from Elsevier.

Figure 3. IR absorbance spectra of CH4-derived products (A) HCHO (B) CH3OH (Q CH3OOH and (D) CH3OOCH3.

Figure 4. IR absorbance spectra of RN02, RONO, RON02> and ROON02...

Figure 5. IR absorbance spectra of 12C- and 13C-labeled formaldehyde in the frequency regions of 1600-1850 and 2600-3050cm-1.

Figure 6. IR absorbance spectra of12C- and 13C-labeIed formic acid in the frequency regions of 1025-1175 and 1675-1825cm-1.

Figure 11. IR absorbance spectra of isotope-labeled PAN CH3C(0)0014N02 and CH3C(0)0015N02 in the frequency region of 500-2000 cm. Values in parentheses in (C) are approximate frequency shifts in cm-1 for 15N-labeled PAN. Band assignments taken from Ref. 95.

Figure 12. IR absorbance spectra of CH3OOH, CH3C(0)OH and CH3C(0)00H in the frequency region of 600-3700cm-1.

Figure 21. IR absorbance spectra of CH3C(0)X (X = CHO, CH2OH, and OCH3) and isobuteneozonide. Approximate frequencies are indicated for the characteristic bands of each X group.

IR absorbance spectra of products from, 81 methanol from, 81 peroxyalkyl nitrates from, 84 Atmospheric oxidation of peroxyacetyl radical, 96... 

Time-resolved polarized IR absorbance spectra of photolyzed MbCO are shown in Fig. 7. The A-state spectra reveal two overlapping features, denoted A and A3 after Ormos et al. (17), with Ai blue-shifted relative to A3. The ratio of the polarized absorbance, AA /AA11, is nearly constant... 

Experimental IR absorbance spectra, measured during the cycloaddition of 1 and 3 in CH2CI2 solution at 60 °C and 1500 bar, are shown in Fig. 6.7-16. Absorptions attributed to the solvent and to vibrational modes, which do not change during the reaction, are easily eliminated by subtracting the first spectrum, which is recorded after the system has reached the experimental temperature and pressure, from all subsequently measured spectra. The spectra shown in Fig. 6.7-16 are thus transformed into the spectroscopic data... 

F re 5.9 Infrared (IR) absorbance spectra at various locations of a Knoop indentation mark made undo" various liquids. (From Ref. (4).)... 

Fig. 30 Difference in the IR absorbance spectra of n-hexane (upper spectrum) and neopentane (lower spectrum) in H-ZSM-5...

A fundamental property of chemical bonds is that they exhibit vibrations at distinct frequencies. The vibrational frequency of a given chemical bond is intrinsic to the chemical bond of interest [6]. The characteristic frequencies of a given molecule are called a vibrational spectrum. There are many methods for the investigation of vibrational spectra. The most basic measurement technique for molecular vibrations is IR absorbance spectroscopy. In practice IR absorbance spectra are measured by FT methods, which are described later in this chapter. The vibrations measured by an FT-IR are often enough to uniquely chemically identify small amounts of... 

Scanning electron micrograph of a [Chi(HAP)/PAA]2 bilayer film with the hydroxyapatite nanoparticles, which are interwoven in the multilayer architecture and complexed to chitosan (g) IR absorbance spectra of the different components of the osteoconductive layer (i) chitosan, (ii) hydroxyapatite, (iii) poly(acrylic acid), (iv) [Chitosan/HAP]j, (v) [Chitosan/ PAA]j , and (vi) [Chi(HAP)/PAA] . 

Figure 5.29. IR absorbance spectra of as-deposited 84-nm Ta205 film on Si wafer measured at normal incidence (dashed line) and 65° angle of incidence (solid line). Reprinted, by permission, from R. A. B. Devine, Appl. Phys. Lett. 68,1924 (1996). Copyright 1996 American Institute of Physics.

Figure 6.16. IR absorbance spectra of SOI structures made by (a) SIMOX and (b) SIA processes. Reprinted, by permission, from A. Perez, J. Samitier, A. Comet, J. R. Morante, P. L. F. Flemment, and K. P. Homewood, Appl. Phys. Lett. 57, 2443 (1990). Copyright 1990 American Institute of Physics.

Figure 16.4. IR absorbance spectra of a series of increasing chain length methyl substituted oligoazines. All spectra were normalized to the intense and invariant peak at 1358 cm" and offset on the absorbance scale for clarity.

Figure 12 IR absorbance spectra of three similar dearcoat resins. These spectra are indistinguishable but addition of a second analytical tedmique as shown in the next figure, can facilitate discrimination. Reproduced with permission from Ryland. S. G., etal., Discrimination of the 1990s Original Automobile Paint Systems A Collaborative Study of Black Nonmetallic Base CoatIClear Coat Finishes Using Infrared Spectroscopy." Journal of Forensic Sciences 46 (2001), 31-45. Copyright 2001ASTM International.

Figure 3.12 IR absorbance spectra (after vector normalization and in arbitrary units) obtained via SR (in red) or conventional source (in blue) from a single cell area of 5 gm x 5 gm. Experiment performed at Diamond beamline B22 in reflection mode using the 74 x objective, resolution 4cm and 128 scans.

Figure 10.4 Overlaid SRS FT-IR absorbance spectra recorded from the 15 lOpmxlOpm areas marked on Figure 10.3(b).

Figure 10.5 Pre-processed SRS FT-IR absorbance spectra over the range 1806 to 938 cm recorded from the 15 lOiamxlOiam areas marked on Figure 10.3(b), and used as input data for multivariate analysis using Pirouette software. (The abscissa scale reversal is a consequence of loading the data into the Pirouette software for multivariate analysis.)...

Figure 10.7 Overlaid normalized SRS FT-IR absorbance spectra of the average spectrum recorded within each of the three regions shown in Figure 10.3(b). The two average spectra of the tumour regions, solid lines, (the means of spectra 1-5 and spectra 11-15) are closely overlaid, but the average spectrum (mean of spectra 6-10) from the stroma region, dashed line, shows significant differences.

Figure 10.8 Dendrogram from an HCA of pre-processed mid-IR absorbance spectra...

Figure 10.11 Overlaid, normalized SRS FT-IR absorbance spectra of the average spectrum recorded from within in each of the three regions shown in...

Figure 4.6 Quantitative analysis by FTIR of propylene/ethylene (P/E) copolymers I IR absorbance spectrum of P/E with mainly isolated E groups II IR absorbance spectrum of P/E copolymer with mainly adjacent E units III IR absorbance spectra of blend of polypropylene and linear polyethylene a represents spectra at room temperature b represents spectra of melt , i.e. at 145°C c represents resolution enhanced melt spectra IV band area per unit thickness measurements of 720 cm and 733 cm absorption bands versus wt% of -CH2- as-(CH2)/i- ( 5) and -(CH2)3- determined from C-NMR data. V quantitative determination of -(CH2)3- groups as a proportion of the total combined ethylene content of P/E copolymers—correlation of absorbance ratio 733cm V(720cm + 733cm ) with C-NMR data. Note in IV, IR absorbance per methylene appears essentially independent of the length of the E sequence. Reproduced from refs. 96 and 97 by permission of Springer-Verlag, New York, and The Royal Society of Chemistry, London,...

Figure 3. IR absorbance spectra of irradiated EVA (Tq/so), unirradiated EVA/TMPTMA blend (T5/0), unirradiated EVA/TMPTMA blend (T5/20). unirradiated EVA/TAC blend (T5/20),...

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