By Linus Pauling

Thorough dialogue of many of the kinds of bonds, their relative natures, and the constitution of molecules and crystals.

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Extra info for The nature of the chemical bond and the structure of molecules and crystals : an introduction to modern structural chemistry.

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The hypochromicity phenomenon and relevant theories are discussed in detail in a recent monograph [42]. Fig. 15 Thermal denaturation of DNA (E. coli). Relative absorbance at 260 nm vs. temperature at various concentrations of KCl (given in the graph in units of mol L–1). Adapted from Marmur et al. [41] with permission from Elsevier. 2). Regarding polypeptides, proteins, and nucleic acids, it is a powerful tool for analyzing secondary and tertiary structures and for monitoring conformational changes.

Spectral narrowing has been observed for thin polymer films (200–300 nm thick) on planar glass substrates. The films act as wave guides since the refractive index of the polymer is larger than that of the surrounding air or the glass substrate. Immediately after absorption of a light pulse, some photons are spontaneously emitted from certain excited sites. These photons are coupled into the guided-wave mode and stimulate radiative deactivation processes of other excited sites upon propagation through the film, a process denoted as amplified spontaneous emission.

W. Meijer, Adv. Mater. 7 (1995) 385. J. Li, G. B. -S. Cheon, M. M. Green, J. V. Selinger, J. Am. Chem. Soc. 122 (2000) 2603. B. Chae, S. W. Lee, M. Ree, S. B. Kim, Vibrational Spectrosc. 29 (2002) 69. W. Klöpffer, Introduction to Polymer Spectroscopy, Springer, Berlin (1984). D. O. Hummel, Atlas of Polymer and Plastics Analysis, 3rd Edition, Wiley-VCH, Weinheim (2005). A. Elliott, Infrared Spectra and Structure of Organic Long-Chain Polymers, Arnold, London (1969). M. Claybourn, Infrared Reflectance Spectroscopy of Polymers.

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