Scattering recommended references

The International Union of Pure and Applied Chemistry recommends that the definition should now be based on the ratio of the radiant power of incident radiation (Pq) to the radiant power of transmitted radiation (P). Thus, A = log(Po/P) = log T. In solution, Pq would refer to the radiant power of light transmitted through the reference sample. T is referred to as the transmittance. If natural logarithms are used, the quantity, symbolized by P, is referred to as the Napierian absorbance. Thus, B = ln(Po/P). The definition assumes that light reflection and light scattering are negligible. If not, the appropriate term for log(Po/P) is attenuance. See Beer-Lambert Law Absorption Coefficient Absorption Spectroscopy... 

Explicit expressions for the T matrix can be obtained by casting the scattering problem in integral rather than differential form. Details are given in the references cited above. We also recommend an expository article by Strom (1975). 

The fourth volume of Landau and Lifshitz s famous course on Theoretical Physics is devoted to quantum electrodynamics. It also covers the problem of electron-electron scattering and the two-electron boimd state problem (Breit equation) from this point of view. Since om presentation of QED was rather brief in this chapter, we recommend the volume from Landau and Lifshitz s course for further reference. 

The available experimental data for binary and ternary systems can be used as primary reference data, or as the initial values for further refinement, in order to obtain recommended values, particularly, the internally consistent values that are used for thermodynamic calculations and modelling of multicomponent equilibria and reactions. However, the recommended values are derivatives and largely depend on the method of treatment based on more or less rigorous and varying models. Thus, a collection of experimental data not only incorporates original information from widely scattered scientific pubhcations, it is fundamental and provides the foundation for modem and future databases, and recommended values. 

Tauscher [1.63] used the comparative version of the nonfixed method of heated platinum filament. The diameter of the thread at both probes was 20 p.m, and the length was 50 mm. Highly viscous silicone oil was used as the reference liquid, the X of which was determined during control tests for toluene. Control tests were conducted after each series of measurements. Thermal conductivity values of toluene recommended in Ziebland s work [2.40] were taken as reference points. The scatter in Tauscher s experimental points, as shown by the results of the control tests with toluene, is about 3-4%. At the same time, the experimental data for thermal conductivity of Freon-21 agree fairly well with the results of much later investigations [2.5, 2.7]. 

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