Raman/infrared atlas

The Aldrich Library of Infrared Spectra , 3rd ed., Aldrich chemical Company, Milwaukee, WI, 1981, by Pouchert contains more than 12,000 IR spectra so arranged that the user can readily see the change that takes place in a given spectrum when a slight change is made in the structure of a molecule. The same company also publishes the Aldrich Library of FT-IR Spectra and the Aldrich Library of NMR Spectra , both also by Pouchert. A similar volume, which has ir and Raman spectra of about 1000 compounds, is Raman/Infrared Atlas of Organic Compounds , 2nd ed., VCH, New York, 1989, by Schrader. 

Schrader, B., Raman/Infrared Atlas of Organic Compounds, 2nd ed., Wiley-VCH, Weinheim, 1989, 1118. 

For nonabsorbing crystal powders, the 0° multiple reflection arrangement shown in Fig. 3.5-8 g has proven to be superior to other arrangements, because it combines a high intensity of the Raman radiation with the maximum ratio of Ram an/exciting radiation, Ir/Ip- All of the Raman spectra of crystal powders reproduced in the Raman/ Infrared Atlas (Schrader, 1989) have been recorded with an arrangement according to this principle. 

B. Schrader, Raman / Infrared Atlas of Organic Compounds, 2nd edn, VCH, Weinheim and New York, 1989. 

Schrader B (ed) (1989) Raman/Infrared Atlas of Organic Compounds. Weinheim VCH Verlagsgesellschaft. Schrader B and Moore DS (1997) Laser-based molecular spectroscopy for chemical analysis - Raman scattering processes (lUPAC Recommendations 1997). Pure and Applied Chemistry 69 1451-1468. 

J. B. Schrader, Raman/Infrared Atlas of Organic Compounds, 2nd ed., VCH Publishers, New York, 1989. 1118 pp. Raman and IR spectra plotted on the same scale for about 1000 compounds. The spectra are large they are vertical on the page, and each page has one pair of spectra. Very good. 

R.A. Nyquist, C.L. Putzig, M.A. Leugers, Infrared and Raman Spectral Atlas of Inorganic Compounds and Organic Salts Text and Explanations (Academic Press, San Diego, 1996)... 

In this section of the present book a general survey of characteristic vibrations in organic molecules is given. By a specific discussion of typical features of the characteristic vibrations of distinct groups and of typical classes of compounds, their inherent dependence on bond properties, symmetry, structural characteristics and their environment is demonstrated. Since infrared and Raman spectra supply complementary images of a vibration, both spectra are discussed simultaneously and combined infrared and Raman spectra are reproduced as examples. They are taken from the atlas published by Schrader (1989). 

Typical features of the spectra of polymers are the changes introduced when the polymer chains are oriented by strain. When observed with polarized radiation the changing orientation of the molecular chains is visible by pleochromism of the infrared bands or the changes of the polarizability in the Raman spectra. Stress relaxation and the effects of fatigue and fracture may be observed, especially when the spectral subtraction technique is applied. These methods are well described by Siesler and Holland-Moritz (1980). In the Atlas of polymer and plastics analysis by Hummel and Scholl (1991) the methods of polymer analysis are described exhaustively and the spectra of plastic material and its constituents are collected. 

Infrared and Raman spectra, both scaled to the most intensive bands, are presented as stack-plots in the region 4000-100 cm. The absorbance scale is more suitable for comparison of relative band intensities in the IR and Raman spectra. On the other hand, in most IR atlases the spectra are presented using the transmittance scale this includes the only atlas of combined IR and Raman spectra [59] which uses the central part of the page, between the spectra, for chemical structure representation. Thus the conventional transmittance scale was chosen as it is more suitable for rational distribution of information in the combined figure and for an easier comparison by the reader of presented IR spectra with other well-known reference collections. 

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