Light, modern theory properties

Discussion of the H bond theory is divided into two portions in this chapter. First, the nature of the bond itself is considered, together with the relevant and informative data. Second, theoretical treatments of individual properties of H bonded systems (such as heat of formation, vibrational perturbations, NMR shifts, dielectric effects) are considered in the light of the first part. Before proceeding with the discussion, however, it will be helpful to review certain aspects of modern theory of the chemical bond. 

The answers to the above questions, not all of which need he presented here, were formulated between 1925 and 1926, in the revolution of modern quantum theory, which shook the foundations of physics and philosophy. Remarkably, the central theme of quantum theory was the nature of light, and what came to be called the wave-particle duality. But other broader implications of the new theory existed, and the first inkling of this was given in 1924 by Louis de Broglie (Fig. 3.26) in his doctoral dissertation. He postulated that particles may also possess wavelike properties and that these wavelike properties would manifest themselves only in phenomena occurring on an atomic scale, as dictated by Planck s constant. He also postulated that the wavelength of these matter waves, for a given particle such as an electron or proton, would be inversely proportional to the particle s momentum p, which is a product of its mass m and speed... 

Poly(phenylenevinylene) has been considered for many different applications due to its importance in nanoscale electronic devices. One such application is the search for efficient light emitting diodes. This property is the result of the electrooptical effect and constitutes an important area of modern research in theory as well as experiment. The efficiency of the nonradiative... 

Chapter 10 (Modern Atomic Theory) In Chapter 10 we have expanded our treatment of the atom by adding a section on the historical development of the structure of the atom. This material on Rutherford s work will give students a better perspective on how the current model of the atom was conceived. We have also greatly expanded our treatment of light with new emphasis on the properties of waves and the dual nature of light. 

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