C Is spectra

Figure 8.15 shows the C Is spectra of ftiran, pyrrole and thiophene. Owing to the decreasing electronegativity of the order O > N > S the C Is line is shifted to low ionization... 

Figure 2.41. X-ray photoemission spectra of Fe foil after CO hydrogenation at 548 K in CO/H2=1 20 at 1 bar total pressure and varying reaction times, (a) C Is spectra from K-free Fe. (b) K 2p and C Is spectra from K-covered Fe, Ok -OA 28 Reprinted with permission of the American Chemical Society.

ESCA analyses were performed nsing a Physical Electronics PHI 5600 ci spectrometer eqnipped with an aluminum monochromatic x-ray sonrce. Hydrogen reduction at 75°C and 150°C was performed in situ in a reaction chamber attached to the main ESCA analytical chamber. Gas mixtnre of 80/20 N2/H2 was nsed for the hydrogen rednction. Charge correction was performed shifting the C-(C,H) peak in C Is spectra to 284.8 eV. PHI MultiPak software version 6.0A was nsed for data analysis. 

Figure 54. Peculiar surface chemistry of BOB anion on graphitic anode material XPS C Is spectra for a graphitic anode surface cycled in LiBOB- and LiPF6-based electrolytes. The peaks were resolved into three major contributions representing (1) hydrocarbon at 284.5 eV, (2) oligo-ether linkages at 286.5 eV, and (3) lithium alkyl carbonates at 289.37 eV, respectively. (Reproduced with permission from ref 489 (Figure 3). Copyright 2003 The Electrochemical Society.)...

Figure 2. XPS C Is spectra for oligourethane based coatings (a) untested oligomer coating surface (b) interfacial coating surface after mechanically induced adhesion loss (c) interfacial coating surface after humidity induced adhesion loss. Spectral components A, B, C, and D attributed to methyl/methylene, ether, melamine, and urethane carbonyl carbons, respectively. Reproduced from Ref. 19, copyright 1984, American Chemical Society.

Figure 25.2 C Is spectra recorded (dots) at three different photon energies from VC(100). The solid curves represent the results of a curve fitting procedure.

A survey and carbon Is spectrum from untreated white pine is shown in Figure 36. Survey spectra and chlorine 2p as well as carbon Is spectra are shown in Figure 37 taken from white pine treated with hydrogen peroxide, HCL, and acetic acid with heating. This oxidative treatment has oxidized carbon as evidenced by shoulders in the C Is spectra at higher binding energies and introduced carbon chlorine bonds on the surface as evidenced by the chlorine 2p line around 200 eV. 

Figure 14.11 XPS C Is spectra for APTS modified hydrated silica upon treatment under Ar (a) after modification (b) treated at 1273 K.

Figure 7 follows the interface formation between Cr and polyimide, both in the case of Cr on polyimide and polyimide (initially polyamic acid) on Cr. The C Is spectra show significant changes as the interface developes. There is actually a remarkable correspondence between the two types of interfaces (48). N Is and 01s spectra also exhibit similar striking correspondence. These results tend to support the reaction via the carbonyl moiety (32) than the delocalized Cr arene complex formation interpretation (30). 

Figure 7. C Is spectra from polyamic acid on Cr, cured polyamic acid on Cr (Reproduced from Ref. 48. Copyright 1989 American Chemical Society.) and Cr on polyimide Interfaces. (Reproduced with permission from Ref. 32. Copyright 1987 American Physical Society.)...

Figure 14. C Is spectra from a thick and a thin PMDA film.

Figure 5. (a) XPS C Is spectra for PTFE film before (solid line)... 

For all cured, non-modified polyimide films studied, the C Is spectra showed extremely weak satellite features centered about 292.8 0.3 eV. To date, we have not studied these shake up structures extensively. We have noted, however, that they frequently do not exist in the C Is spectra of the polyamic acid films. These low intensity features appear resolvable into two Gaussian components of unequal intensity. Their chemical shifts are consistent with assignments given to n ntransitions e.g., D.T. Clark et al, J. Electron. Spectrosc. Relat. Phenom., 51... 

Figure 5.6 depicts the temperature dependence of deposition rate for the plasma polymerization of PFBTHF shown as plots of k versus T. The XPS C Is spectra of polymers deposited at different temperatures under different energy input levels are shown in Figure 5.7. Table 5.3 depicts the details of XPS C Is spectra shown in Figure 5.7. The important aspects of the results are as follows ...

Figure 5.7 ESCA C Is spectra of plasma polymers of perfluoro-2-butyltetraliydrofuran obtained at different WjFM and substrate temperature.

Figure 10.12 FIs and C Is spectra from both alloy panels and Si wafer pieces attached to them. Top figure panels are from samples exposed to the evacuation process and bottom panels are from samples exposed to the O2 plasma cleaning process. The third trace in each of the bottom panels is from an alloy panel that was O2 plasma cleaned in a new reactor with minimal fluorine contamination, indicating that the high binding energy C Is peak is not associated with fluorocarbon bonding.

As the WjFM value decreases to the energy-deficient domain, the composition and the structure are changed according to the operating conditions. This could be seen in the F/C ratios and C Is spectra in the medium reactor at a low WjFM level in Figures 19.6 and 19.7b. In addition, the composition and structures of the polymer prepared far from the electrodes also show this pattern. The F/C ratios and C Is spectra of the polymers prepared at 15 cm downstream are shown in Figures 19.8, and 19.9, and 15 cm upstream positions are illustrated in Figures 19.10, and 19.11. These data clearly demonstrate that the size of reactor affects the deposition kinetics and the polymer characteristics under otherwise identical operational conditions. 

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