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This collection of papers describes investigations of luminescence centers in II-VI crystal phosphors, ruby, and molecular crystals. These investigations were carried out using spec­troscopy in a wide range of wavelengths, electron paramagnetic resonance, and polarization methods. The relationship between the thermal and optical depths of electron traps is considered specifically. The articles in this collection should be of interest to all sc...

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Neutral Current Sheets in Plasmas in Space and in the Laboratory.- 1. Introduction.- 2. Production of a Quasisteady Neutral Sheet.- 3. The Neutral Sheet or Petschek Flow?.- 4. Decrease in the Plasma Density near a Neutral Sheet.- 5. Stability of a Neutral Sheet.- Literature Cited.- Hydrodynamic Plasma Flow in a Strong Magnetic Field.- I. Hydrodynamic Plasma Flow in a Strong Magnetic Field in the Absence of Null Lines.- 1. Existence of Continuo...

The rapid development of lasers in the past few decades has led to their application in almost every field of science and technology. The idea that it should be possible to convert the energy released in chemical reactions of chemical lasers directly into coherent radiation resulted in the advent in the 1960s. These first chemical lasers, however, consumed much more energy to initiate the reaction than they emitted. The search for more ef­ fic...

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This anthology is devoted to the theoretical and experimental study of coherent phenomena in quantum optics. Considerable attention is devoted to the investigation of cooperative effects in multilevel molecular and atomic systems. The theoretical analysis is based on a single approach, using the theory of groups, which makes it possible to present the results in a compact and physically elegant form. The results of a detailed experimental and ...

This volume contains the results of many years of investigations of pulse gas-discharge lasers carried out at the Optical Laboratory of the Lebedev Physics Institute in Moscow. The two papers report mainly experimental results obtained in studies of pulse lasers utilizing translations in metals (Isaev and Petrash) and electronic transitions in diatomic molecules (Kaslin and Petrash). Population inversion mechanisms and the principal properties...

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Stimulated Mandel¿ shtam ¿ Brillouin Scattering Lasers V. V. Ragul¿skii.- I Conditions for Obtaining Stationary Lasing with Stimulated Scattering of Light.- ¿ 1. Influence of Intensity, Energy Density, and Exciting-Radiation Pulse Duration on the Laser Operation.- ¿ 2. Experimental Verification of the Conditions for Stationary Lasing.- II Gains and Line Widths for SMBS in Gases.- III Single-Frequency SMBS Ring Laser.- ¿ 1. Feasibility of Effec...

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This anthology includes articles on experimental studies of the interaction of high-power electromag­ netic waves with collisionless plasmas and with electrons. The nonlinear interaction of waves with plasmas has been investigated both under free space conditions and in waveguides. A study of secondary-emission dis­ charges was made in order to ascertain their possible effect on measurements in waveguides. The results presented here on the int...

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This volume reports investigations which form part of a major series of theoretical and experimental studies being carried out in the Laboratory of Low-Temperature Plasma Optics at the Lebedev Physics Institute in Moscow. The papers give the results of systematic investigations of the chemical composition and of the electrical and optical properties of discharge plasmas, and also of populations of laser levels. Reliable and detailed informatio...

This collection contains survey articles dealing with the following topics: The Mach principle and its role in the general theory of relativity, the modern conception of the vacuum, new methods in the theory of Lie group representations, the coherent state method and its application to physical problems, and the Newman-Penrose method and its application to problems in general relativity theory.

This volume, which comprises a collection of papers by leading Soviet researchers, is devoted to topics in the luminescence of semiconductors. An experimental check is made on a series of predictions of the theory of ionization domains. A new low-voltage luminescence of zinc sulfide is described and investigated and is found to be due to a high-frequency electrical instability. A detailed study of the electrical properties of the instability a...

This volume examines a timely problem in solid state physics, the condensation of ex­ citons in semiconductors. The papers in this volume describe a new approach to the study of exciton condensation based on microwave-frequency conductivity and the breakdown of an ex­ citon gas in a microwave field, an effect discovered by the authors. These methods have been used in extensive studies of germanium and have produced important new data about the...

Radiation Emitted from Semiconductor Lasers in Strong Magnetic Fields and under High Hydrostatic Pressures.- I Influence of Magnetic Fields and High Pressures on Energy Spectra of Semiconductors.- ¿1. Influence of Magnetic Fields on Energy Structure of III¿V and IV¿VI Semiconductor Compounds.- ¿2. Influence of Pressure on Energy Structures of III¿V and IV¿VI Compounds.- ¿3. Characteristics of Semiconductor Laser Operation Affected by Variation...