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Surface spectroscopy surfaces

SIMS Secondary-ion mass spectroscopy [106, 166-168] (L-SIMS liquids) [169, 170] Ionized surface atoms are ejected by impact of -1 keV ions and analyzed by mass spectroscopy Surface composition... [Pg.316]

SANS Small-angle neutron scattering [175, 176] Thermal or cold neutrons are scattered elastically or inelastically Incident-Beam Spectroscopy Surface vibrational states, pore size distribution suspension structure... [Pg.316]

Analytical Atomic Spectroscopy Surface Analysis," Mnnual Book ofMSTM Standards, part 3.06, American Society for Testing and Matedals, Philadelphia, Pa., 1992. [Pg.213]

The data above were collected in UHV environment to achieve the most pristine surface. Spectroscopy in air is usually more difficult to interpret due to contamination with oxides and other species, as is the case with all surface-sensitive spectroscopies. [Pg.94]

Several features of ISS quantitative analysis should be noted. First of all, the relative sensitivities for the elements increase monotonically with mass. Essentially none of the other surface spectroscopies exhibit this simplicity. Because of this simple relationship, it is possible to mathematically manipulate the entire ISS spectrum such that the signal intensity is a direct quantitative representation of the surface. This is illustrated in Figure 5, which shows a depth profile of clean electrical connector pins. Atomic concentration can be read roughly as atomic percent direcdy from the approximate scale at the left. [Pg.520]

Sputter-Initiated Resonance Ionization Spectroscopy Surface Analysis by Resonant Ionization Spectroscopy Time-of-Flight Mass Spectrometer... [Pg.768]

Kolb and Franke have demonstrated how surface reconstruction phenomena can be studied in situ with the help of potential-induced surface states using electroreflectance (ER) spectroscopy.449,488,543,544 The optical properties of reconstructed and unreconstructed Au(100) have been found to be remarkably different. In recent model calculations it was shown that the accumulation of negative charges at a metal surface favors surface reconstruction because the increased sp-electron density at the surface gives rise to an increased compressive stress between surface atoms, forcing them into a densely packed structure.532... [Pg.86]

Some of the transition metal macrocycles adsorbed on electrode surfaces are of special Interest because of their high catalytic activity for dloxygen reduction. The Interaction of the adsorbed macrocycles with the substrate and their orientation are of Importance In understanding the factors controlling their catalytic activity. In situ spectroscopic techniques which have been used to examine these electrocatalytlc layers Include visible reflectance spectroscopy surface enhanced and resonant Raman and Mossbauer effect spectroscopy. This paper Is focused principally on the cobalt and Iron phthalocyanlnes on silver and carbon electrode substrates. [Pg.535]

Surface Spectroscopy of Platinum-Cadmium SuUide-PerfluorosuUbnate Polymer Systems... [Pg.566]

KAKUTA ET AL. Surface Spectroscopy of Pt-CdS-Perjluorosulfonaie Polymer 567 Experimental... [Pg.567]

Figure 1. Trimethylbenzene production from reduced Ti02 (001) surfaces. Production of trimethylbenzene quantified by monitoring m/e 105 using mass spectroscopy. Surface annealed to 530 K prior to experiment (P = 8x10 mbar, T = 400K). Figure 1. Trimethylbenzene production from reduced Ti02 (001) surfaces. Production of trimethylbenzene quantified by monitoring m/e 105 using mass spectroscopy. Surface annealed to 530 K prior to experiment (P = 8x10 mbar, T = 400K).
One major interest in vibrational surface spectroscopy is the ability to directly probe lipid layers. Similarly to the previous case, the structure of the alkyl chains of phospholipids is readily determined from the ratio of the magnitude of the CH2 and CH3 symmetrical stretching modes [136,137]. At the D2O-CCI4 interface, a layer of... [Pg.159]

J. W. Linnett. There were 11 papers with theoretical inputs but with more emphasis given to new developments in experimental methods including structural (LEED and electron microscopy) and surface spectroscopies. LEED provided crucial evidence for the role of surface steps at platinum single crystals in the dissociation of various diatomic molecules, while electron microscopy revealed the role of dislocations as sites of high reactivity of... [Pg.7]

In this chapter, we have chosen from the scientific literature accounts of symposia published at intervals during the period 1920 1990. They are personal choices illustrating what we believe reflect significant developments in experimental techniques and concepts during this time. Initially there was a dependence on gas-phase pressure measurements and the construction of adsorption isotherms, followed by the development of mass spectrometry for gas analysis, surface spectroscopies with infrared spectroscopy dominant, but soon to be followed by Auger and photoelectron spectroscopy, field emission, field ionisation and diffraction methods. [Pg.9]

Ammonia oxidation was a prototype system, but subsequently a number of other oxidation reactions were investigated by surface spectroscopies and high-resolution electron energy loss spectroscopy XPS and HREELS. In the case of ammonia oxidation at a Cu(110) surface, the reaction was studied under experimental conditions which simulated a catalytic reaction, albeit at low... [Pg.23]

Table 2.1 Surface chemistry mediated via oxygen transients evidence from surface spectroscopy. Table 2.1 Surface chemistry mediated via oxygen transients evidence from surface spectroscopy.
Oxygen activation of molecules at metal surfaces was first established in the 1970s by surface spectroscopies (XPS and UPS) over a wide temperature range (80-400 K). Furthermore, the distinction was made between the reactivity of partially covered surfaces and the relative inactivity of the oxide monolayer. [Pg.99]


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See also in sourсe #XX -- [ Pg.211 ]




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