Optical Studies in Liquids and Solids

✍ Scribed by Academician D. V. Skobel’tsyn (auth.), Academician D. V. Skobel’tsyn (eds.)

• Publisher: Springer US
• Year: 1969
• Tongue: English
• Leaves: 269
• Series: The Lebedev Physics Institute Series 39
• Edition: 1
• Category: Library

✦ Synopsis

The study of the vibrations of polyatomic molecules has recently turned into one of the most widespread and powerful methods of studying molecular structure. These vibrations ap­ pear directly in the infrared absorption spectra and Raman spectra of gases, liquids, and solids. A measurement of the number of bands in addition to their positions (frequencies or wavelengths) offers the possibility of obtaining a great deal of important information regarding the geometric and mechanical properties of the molecules, the types of chemical bonds, and so forth. It is now quite difficult to list the vast number of specific problems solved by measuring vibrational fre­ quencies. As a result of the successful development of research methods and the widespread applica­ tion of vibrational spectra in analyzing the structures of molecules and the constitution of ma­ terials, it now becomes necessary to develop the theory of molecular vibrations further. Existing theory, of course, is based on the assumption of the harmonicity of molecular vi­ brations, which, strictly speaking, is not justified experimentally. The anharmonicity of the molecular vibrations has therefore to be taken into account by introducing appropriate approxi­ mations. Thus, in carrying out calculations on the vibrations of polyatomic molecules, one uses the force constants calculated from the observed frequency values. However, as a result of the anharmonicity of the vibrations, the values of the observed frequencies differ from the harmonic values, and the force constants used therefore differ from the true ones, i. e.

✦ Table of Contents

Front Matter....Pages i-ix
Front Matter....Pages 1-4
Review of Literature and Presentation of the Problem....Pages 5-7
Experimental Method....Pages 8-13
Experimental Results....Pages 14-34
Discussion of Results and General Conclusions....Pages 35-42
Front Matter....Pages 49-51
Review of Literature....Pages 52-58
Methods of Obtaining and Analyzing Low-Frequency Raman Spectra....Pages 59-61
Appearance of the Rotional Oscillations of Methyl Groups in Low-Frequency Raman Spectra....Pages 62-70
Appearance of the Rotational Oscillations of Ethyl and Heavier Groups in the Low-Frequency Raman Spectra....Pages 71-82
Front Matter....Pages 87-90
Theoretical Study of the Optical Properties of Metals....Pages 91-95
Measuring Method....Pages 96-111
Results of the Measurements....Pages 112-120
Analysis of Experimental Results....Pages 121-140
Front Matter....Pages 147-151
State of Theoretical and Experimental Knowledge Regarding the Spectral Composition of the Molecular Scattering of Light....Pages 152-160
Theory of the Spectral Composition of the Depolarized Scattering of Light in Liquids....Pages 161-173
Methods of Studying the Spectral Composition of Scattered Light....Pages 174-183
Results of an Experimental Study of the Spectrum of Depolarized Scattered Light in Low-Viscosity Liquids....Pages 184-192
Determination of the Velocity and Absorption of Hypersound in Liquids from the Width of and Spacing between the Mandelshtam-Brillouin Components....Pages 193-205
Stimulated Molecular Scattering of Light....Pages 206-213
Front Matter....Pages 217-217
Presentation of the Problems....Pages 219-221
Study of γ-Luminescence in Alkali Iodides....Pages 222-234
Front Matter....Pages 217-217
Study of the Spectral Characteristics of the Photoexcitation of Phosphors Based on Alkali Iodides....Pages 235-245
Concentration Dependence of the Time Characteristics of the Phosphors CsI-Tl and KI-Tl....Pages 246-253
Discussion of Results....Pages 254-261

✦ Subjects

Atomic, Molecular, Optical and Plasma Physics