Coverage determination

Figure 4. Left, copper TPD from a Ru(0001) surface at copper coverages corresponding to a, 0.6 ML, b, 1.5 ML, c, 2.5 ML, and d, 5.2 ML. (Data from ref. 3.) Right, electrochemical stripping curves as a function of Cu coverage (determined by AES) for vacuum deposited Cu on Ru(0001). (Data from ref. 16.)...

How could the sensor detection process be modeled and how is the sensing coverage determined ... 

Fig. 17. The CHjO coverage determined from the C—O vibration frequency as function of CHjOH dose at a substrate temperature of200 K (solid circles) and 300 K (open circles). The reaction probability in Eq. (4) at a certain CH3O coverage is the derivative of the curve at that point. (Reproduced by permissionfrom Ryfcerp .)...

FIG. 18. Graphs of total coverage determined coulometrically as a function of the number of cycles (A) ZnS, (B) ZnSe, and (C) ZnTe. 

The number of polymer chains per unit surface area (i.e., the density of surface coverage) determines whether or not interactions between the neighboring chains will have an influence on the extension of the chains from the surfaces. The affinity or the lack of affinity between the neighboring chains also affect the interaction forces. 

Fig. 12.20. Electrosorption of Br and I" on polycrystalline gold. Plot of charge passed vs. coverage determined by EQCM. Slope is the electrosorption valency (from Ref. 60 with permission).

Lithium coverages are reported throughout in terms of percent of AES signal (%Li) defined as (Iu/Su)/(Iu/Su + hudSsub), where / and St are the peak-to-peak amplitude and sensitivity factor of (one of) the most prominent AES features of element i, respectively [14], and the subscript sub represents the metal substrate. For example, in the case of Ag, the peak at 351 eV was used as a reference for Li coverage determinations. 

The area occupied by each adsorbed emulsifier molecule at the polymer-water interface (A ) was estimated from the mean particle size of the latices, determined by the analytical centrifuge, and the amount of emulsifier adsorbed at the interface corresponding to full coverage, determined by adsorption titration. 

Fig. 17. Plot of the values of the resonant amplitude An ( ) and the meiximum value of the resonant part of the SFG intensity (B), Fsfg( co)i derived from the SFG spectra depicted in Fig. 16(a), versus the relative coverage determined from the corresponding TPD spectra of Fig. 16(b). The values of Ar and /sfg( uco) were normalized to unity at saturation coverage.

Figure 5. First and second layer composition in the Cu 100 /Pd surface alloy system as a fimction of Pd coverage determined by combined He /LT LEISS [19],...

Figure 7 IR spectra of the stretching vibration of a partial CO coverage on a polycrystalline Pt electrode. The partially filled CO layer is created in a potential sweep of lOOmV/s with varying positive potential limits. All spectra are recorded at SOmVRHE- Spectrum 1 corresponds to a measurement without potential changes. Spectra 2-14 correspond to measurements after a potentiodynamic cycle with changing positive limits from 255 mV to 675 mV. Inset Dependence of the vibrational peak frequency co on the CO coverage. Determination of the singleton frequency cOs by extrapolating to zero CO coverage. (From Ref. 84.)...

Centers for Medicare Medicaid Services. National Coverage Determination for Magnetic Resonance Spectroscopy (220.2.1). September 2004. http //www.cms.hhs.gov... 

This process gives sharp voltammetric peaks that offer e.g. preeise surface coverage determination at well-defined surfaees. Use of single-erystal, say Au(lll)-surfaees has substantiated that densely paeked thiolated oligonucleotide monolayers, almost resembling a moleeular brush , ef section 4 are formed.A similar conclusion was reported by Palacek and associates who exploited the intrinsically atomically planar nature of a liquid mercury electrode surfaee. The notion of two-dimensional condensation has been invoked for sueh phenomena. 

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