Region of stability

For a line OB (Figure 25.4) of smaller slope (smaller a/q or smaller U/V), an even greater range of m/z values will be transmitted through the quadrupole assembly. Conversely, for a line OC that passes through the apex (r) of the region of stability, no ions of any m/z value are transmitted. 

Fe/HjO system Figure 1.15 (top) is a simplified version of the Fe-H O potential-pH equilibrium diagram [the region of stability of magnetite (FesO ) is not included] and it is instructive to consider some of the more important equilibria involved ... 

There are three common ways by which nuclei can approach the region of stability (1) loss of alpha particles (a-decay) (2) loss of beta particles (/3-decay) (3) capture of an orbital electron. We have already encountered the first type of radioactivity, a-decay, in equation (/0). Emission of a helium nucleus, or alpha particle, is a common form of radioactivity among nuclei with charge greater than 82, since it provides a mechanism by which these nuclei can be converted to new nuclei of lower charge and mass which lie in the belt of stability. The actinides, in particular, are very likely to decay in this way. 

From the thermodynamic behavior of metals pertinent to gold leaching in cyanide solutions it may be observed that Au(CN) shows a large region of stability over the whole pH range, whilst metallic gold, which is usually stable in aqueous solutions under all condi-... 

One of the difficulties in working with miscible blends is that they are often very temperature-sensitive. The temperature sensitivity depends on the components of the blend, but once you pass the region of stability, the two components will separate and the material becomes an... 

Fig. 5 Regions of stability of either one or the other spin state as a function of the ligand-field strength. The region of spin crossover compounds is indicated by the shaded area. For the calculation, the values of the Racah parameters were taken to be 75% of the free ion values. This corresponds to a typical reduction for iron(II) coordination compounds of the type under consideration... 

The region of stability in the z plane can be found directly from the region of stability in the s plane by using the basic relationship between the complex variables s and z. [Equation (18.23).]... 

The limit of stability becomes the imaginary axis in the log-z plane and the region of stability is the left half of the log-z plane. This is analogous to the situation in the continuous s plane. 

Figure 5.5. Isotherms for CO2 taken from the work of Andrews [3]. The shaded area indicates the region of stability of a one-phase liquid system. Liquid and vapor exist together at equilibrium under the dashed curve. Above the critical isotherm, 31.1°C, no distinction exists between liquid and gas. Andrews suggested that the term vapor be used only to represent the region to the right of the dashed curve below the critical temperature. The dashed curve ABCD represents the van der Waals equation. (By permission, from J. R. Partington, An Advanced Treatise on Physical Chemistry, Vol. 1, Longman Group, Ltd., London, 1949,...

Figure 5. Regions of stability of isotropic and anisotropic solutions of 150 bp DNA, calculated according to Stigter 22L) The light band corresponds to the coexistence region for fully charged DNA, the dark band to DNA with 76% of charge neutralized by counterion condensation. The salt/DNA concentration regions where the gelation and ordinary-extraordinary transitions were studied are indicated by brackets.

Fig. 3.1 Regions of stability for the Cd-ammonia system for 0.1 M total Cd concentration and at room temperature. The hydroxide line separates conditions where Cd(OH)2 will (above the line) or will not (below the line) thermodynamically exist. The complex line gives the concentration of free Cd + at any pH valne (where the pH is determined only by the ammonia concentration and not, e.g., by added alkali). (Adapted from Ref. 34.)...

Fig. 8.13 The regions of stability of the ferromagnetic and antiferromagnetic states as a function of the normalized exchange integral l/W and d band filling Nd. The crosses mark plausible values of I/W across the 3d series. (From Pettifor (1980).)...

Fig. 45.—Regions of Stability of the Solid Phases in the Ternary System, H2S04 —Na2S04—HaO (P. Pascal and M. Ero).

The division of the parameter plane into regions of stability and instability is reproduced in Fig. 10.3. If pi and k lie within the closed region, the stationary state is unstable and spatially uniform oscillations exist. 

Fig.. 10.13. The regions of stability of different spatial forms in the pi-K parameter plane for...

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