Scans polarization

Figure 2 Experimental data from an early stage of CO adsorbed on Fe (001) known as the GC3 state polar scans (a) of the C 1s-0 Is Intansity ratio taken in two Fe (001) azimuthal planes, the (100) and the (ITO) (the C Is and O Is electron kinetic energies are 1202 aV and 955 aV, respectively) C Is azimuthal scan (b) taken at the polar angle of maximum intensity in (a) and geometry (c) deduced from the data.

Figure 16 Effect of X on the ratio of the 200/020 integrated intensities measured in the polar scans for a drawn ultra-high molecular weight PE film. Reproduced with permission from Lafrance et al. [82]. Reprinted with permission of John Wiley 8t Sons, Inc.

The potential-independent CPT determined by the potentiodynamic method is defined as the lowest temperature at which pitting initiation occurs during a dynamic anodic polarization scan. ... 

Spin-Polarized Scanning Tunneling Microscopy/Spectroscopy. 297... 

An additional interpretation issue involves the presence of oxidation reactions that are not metal dissolution. Figure 28 shows polarization curves generated for platinum and iron in an alkaline sulfide solution (21). The platinum data show the electrochemistry of the solution species sulfide is oxidized above -0.8 V(SCE). Sulfide is also oxidized on the iron surface, its oxidation dominating the anodic current density on iron above a potential of approximately -0.7 V(SCE). Without the data from the platinum polarization scan, the increase in current on the iron could be mistakenly interpreted as increased iron dissolution. The more complex the solution in which the corrosion occurs, the more likely that it contains one or more electroactive species. Polarization scans on platinum can be invaluable in this regard. 

The direct electrochemical measurement of such low corrosion rates is difficult and limited in accuracy. However, electrochemical techniques can be used to establish a database against which to validate rates determined by more conventional methods (such as weight change measurements) applied after long exposure times. Blackwood et al. (29) used a combination of anodic polarization scans and open circuit potential measurements to determine the dissolution rates of passive films on titanium in acidic and alkaline solutions. An oxide film was first grown by applying an anodic potential scan to a preset anodic limit (generally 3.0 V), Fig. 24, curve 1. Subsequently, the electrode was switched to open-circuit and a portion of the oxide allowed to chemically dissolve. Then a second anodic... 

Figure 24 Schematic polarization curve showing the anodic film reformation technique for determining passive oxide dissolution rates (1) original anodic polarization scan to grow the oxide film (2) second anodic polarization scan to regrow the oxide dissolved on open circuit. Qv is the charge lost in open-circuit dissolution between the two scans.

Figure 27 Anodic polarization scan recorded on a creviced specimen of the Ni-Cr-Mo alloy C276 in 0.59 mol dnT3 NaCl at 150°C at a scan rate of 0.8 mV s-1.

Figure 38 Cathodic polarization scans for rotating disk electrode experiment.

Laiho, R., et al. (1997), Spin-polarized scanning tunnelling microscopy with detection of polarized luminescence emerging from a semiconductor tip,/. Phys. Condens. Matter, 9, 5697-5707. 

Scan the Stokes Raman spectrum of CCI4 for shifts of 150 to 1000 cm from the exciting line.t Note that the frequency in wavenumbers is given by v (cm ) = 1/A = vie, where c is the speed of light in cm s Record both parallel and perpendicular polarization scans so that you can determine the depolarization ratio of aU bands. Indicate the spectrometer wavelength or wavenumber reading on the chart at several points in the scan to provide reference points for the determination of the Raman shifts for all bands. 

Figure 7 (a) ALISS polar scan for an fee Pt(l 11) crystal along the [—211] azimuth. The peak... 

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