First-order peak intensity variations

Figure 9. The first order peak intensity variations with temperature obtained during heating at a rate of I C/min for aligned samples of (a) Vector 4111 and (b) Sl-Cl.

The detailed variation in reaction rate with reactant pressures and surface composition has been examined at 200 and at 400 °C. The production of N 2 coincided quantitatively with the intensity of the AES N (390 V) peak the NO production rate correlated well with the intensity of the AES O (510 V) peak. At 200 °C the rate of nitrogen formation was first order in oxygen pressure but independent of NH3 pressure. Conversely at 400 °C the nitric oxide formation rate was first order in ammonia pressure above 4 x 10 Torr. Desorption experiments during the reaction proved the surface species were N atoms and O atoms respectively. 

Figure 4. The intensity variation of an N-layer ciystal (often referred to as an N-slit diffraction pattern). (A) The intensity, plotted as F]2/fo, is shown over a broad Q range for N = 32. (B) The first-order diffraction peak is shown in detail for N = 4, 8, 16, 32. In these units, the peak intensity varies as N2. (C) The same functional form, plotted on a logarithmic scale, shows both the bulk Bragg peak near Q = 2.1 and the continuously modulated intensity found between the bulk Bragg peaks.

Figure 7.10 Variation of the intensity (in arbitrary units) with time t of the first-order Bragg peaks of the L , Lp and Hg phases of 1 2 DMPC/myristic acid mixture (50 wt% in water) after a p-jump from 500 to 110 bar at 58°C that induces the transition from the Lp to the Hg/ Q2 coexistence range. Reproduced from Reference 43 with permission of VCH Verlagsgesellchaft mbH.

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