Phosphorus photoelectron spectrum

The photoelectron spectrum of (CH3) 3ASCH2 shows an energy of only 6.72 eV for the highest occupied molecular orbital, which is predominantly a lone pair localized at the carbanion (69). This energy is lower than in the phosphorus compound (6.81 eV). This result is at least qualitatively in agreement with the picture drawn above. 

Photoelectron.—n-Orbital energies appear to be unsuitable to discern the aromatic nature of phospholes (120) due to combined nn and ttn interactions. It is concluded that n conjugative and P-Cw hyperconjugative interactions stabilize the phos-phole system relative to the interrupted cw-butadiene and phosphorus subunits, and that the p.e. spectrum can be interpreted in favour of an aromatic phosphole ring.143 Other workers have discussed144 and reviewed145 this aromaticity problem, and there has been a quantum-chemical study of the aromatic nature of phosphorus hetero-cycles.144 The p.e. spectrum of the ylide (121) contains peaks at 6.19, 8.32, and... 

Figure 3 Absorption spectrum of the DNA film around the K-shell absorption edge of phosphorus [18]. Dotted line is the total photoelectron yield of KH2PO4. Three vertical arrows indicate the X-ray energies used for the irradiation experiments shown in Fig. 4.

Fig. 4.7. X-Ray photoelectron (XPS) phosphorus (P) 2p spectrum and (P) L-edge XANES spectrum of sodium metaphosphate (Kasrai et al., 1995)...

The smv ey XPS spectrum of PAO membrane plotted in Figure 1 shows the photoelectron peaks of carbon, oxygen and nitrogen, the characteristic polyamide elements, but sodium and chlorine were also observed in some samples with AC < 0.5 % moreover, a small amount of phosphorus atoms was also detected on the surface of PAO, but no other elements were found. These results support the homogeneity and thickness of the dense polyamide layer, which is high enough to hidden the polysulfone support. 

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