Redhead

On setting dRIdt = 0 (and using Eq. XVIII-1), we obtain an equation due to Redhead [89] ... 

If the desorption rate is second-order, as is often the case for hydrogen on a metal surface, so that appears in Eq. XVIII-1, an equation analogous to Eq. XVIII-3 can be derived by the Redhead procedure. Derive this equation. In a particular case, H2 on Cu3Pt(III) surface, A was taken to be 1 x 10 cm /atom, the maximum desorption rate was at 225 K, 6 at the maximum was 0.5. Monolayer coverage was 4.2 x 10 atoms/cm, and = 5.5 K/sec. Calculate the desorption enthalpy (from Ref. 110). 

Redhead [89] gives the approximate equation EjRTm - ln(A7) //3)- 3.64. Check the usefulness of this equation by comparing with the answers to Problems 5 and 6. 

P. A. Redhead, J. P. Hobson, and E. V. Komelsen, The Physical Basis of Ultra High Vacuum, Chapman and Hall, London, 1968. 

P. A. Redhead, Vacuum Science and Technology Pioneers of the 20th Century, History of Vacuum Science and Technology, Vol. 2, AIP Press for the American Vacuum Society, New York, 1994. 

An early account of UHV and its requirements is by Redhead et al. (1962) an even earlier summary of progress in vacuum technology, with perhaps the first tentative account of UHV, was by Pollard (1959). A lively popular account is by... 

Steinherz and Redhead (1962), while advances in vacuum techniques from a specifically chemical viewpoint were discussed by Roberts (1960). 

I restrict my attention to non-relativistic pioneer quantum mechanics of 1925-6, and even further to the time independent formulation. Numerous other developments have taken place in quantum theory, such as Dirac s relativistic treatment of the hydrogen atom (Dirac [1928]) and various modern quantum field theories have been constructed (Redhead [1986]). Also, much work has been done in the philosophy of quantum theory such as the question of E.P.R. correlations (Bell [1966]). However, it seems fair to say that no fundamental change has occurred in quantum mechanics since the pioneer version was established. The version of quantum mechanics used on a day-to-day basis by most chemists and physicists remains as the 1925-6 version (Heisenberg [1925], Schrodinger [1926]). 

Redhead, M. L. G. [1986] A philosopher looks at quantum field theory in H. R. Brown and R. Harre (eds), Conceptual Foundations of Quantum Field Theory, Oxford University Press, Oxford. 

Mill s remark is from Mill (1843). For the more recent controversy see, for example, Campbell and Vinei (1983), Howson (1984), Giere (1984), Redhead (1986) and Mayo (1996), Bayesians in particular have been divided on the issue—the debate within the Bayesian camp revolving round the so-called Problem of Old Evidence (see Earman and Glymour, 1980),... 

For further development of the quantitative treatment of the desorption kinetics, the work of Redhead (31) and of Carter (32) is of great impor-... 

Previous attempts at treating the linear schedule are presented by Ehrlich (29) and Redhead (31), and the exponential schedule by Carter et al. (79). 

In estimating the value of Ed by means of the transcendental equations (28), the circumstance utilized is that the variation of em for a given change in Tm is much less than the variation of exp(em) (31). Until now, only particular solutions have been available for the hyperbolic and linear heating schedules and for the first-order and second-order desorptions. They can be found for example in the fundamental papers by Redhead (31) and Carter (32) or in the review by Contour and Proud homme (106), and therefore will not be repeated here. Recently, a universal procedure for the... 

Figure 4.47. Effect of catalyst potential on the desorption activation energy of 02 from Pt/YSZ calculated from the modified Redhead analysis ( ) and from the initial slope of the TPD spectra (O).30 Reprinted with permission from Academic Press.

One can then use the standard Redhead analysis to the data of Fig. 5.24. To this end one uses the Redhead equation in its generalized form derived by Falconer and Madix 48... 

Figure 5.25. Redhead plot for oxygen desorption from a Pt film deposited on YSZ for various catalyst film potentials vs Au reference electrode. The slope of each line is equal to Ed/R.7 Reprinted with permission from Academic Press.

Figure 5.26. Effect of catalyst potential on the oxygen desorption activation energy, Ed, calculated from the modified Redhead analysis for Pt, Ag and Au electrodes deposited on YSZ.44,46 Reprinted from ref. 44 with permission from the Institute for Ionics.

Figure 8,16. Activation energy of desorption, Ed, of 02 from Ru02 as a function of the applied potential21,25 as extracted from TPD and the modified Redhead equation of Falconer and Madix.25,26 Reprinted from ref. 21 with permission from Elsevier Science.

Direct entry of alumina adjuvants through the skin may occur by the use of therapeutic vaccines, with a resultant transient uptake of aluminium in the brain (Redhead et al., 1992). The injection of talc (magnesium silicate)-containing drugs intended for oral consumption has been shown to induce progressive pulmonary fibrosis in drug abusers (Pare etal., 1989). 

Redhead, K., Quinlan, G.J., Das, R.G. and Gutteridgp, J.M.C. (1992). Aluminium-adjuvanted vaccines transiently increase aluminium levels in murine brain tissue. Pharmacol. Toxicol. 70, 278-280. 

In Kentucky, the acetate of (2S,3S,7S)-3,7-dimethylpentadecan-2-ol 1 was used to assess the population density and flight activity of the European pine sawfly, N. sertifer, amongst the loblolly pine sawfly, N. taedae linearis, and the redheaded pine sawfly, N. lecontei. [28]. The results indicated that, although present, N. sertifer was a minor participant in sawfly populations. 

Hammer, B. T., Fogel, M. L. and Hoering, T. C. (1998) Stable carbon isotope ratios of fatty acids in seagrass and redhead ducks. Chemical Geology 152, 29 41. 

Redhead, Aythya americana-, Louisiana and Texas 1987-88 liver 7.3 (3.9-11.5) DW 68... 

Michot, T.C., T.W. Custer, A.J. Nault, and C.A. Mitchell. 1994. Environmental contaminants in redheads wintering in coastal Louisiana and Texas. Arch. Environ. Contam. Toxicol. 26 425-434. 

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