1 The Hanle Effect and Level-Crossing Spectroscopy-An
Introduction.- 1. Historical Survey.- 2. Classical Interpretation
of the Hanle Effect.- 3. Quantum Mechanical Interpretation of the
Hanle Effect.- 4. The Density Matrix Formalism for the Hanle Effect
(Broad-Band Excitation).- 5. Laser Excitation and Pressure-Induced
Coherences.- 6. Nonzero-Field Level Crossing.- 7. Conclusions.-
References.- Appendix. Magnetic Effects on the Polarization of
Resonance Fluorescence (original work by Wilhelm Hanle, translated
by G. Moruzzi).- 2 The Hanle Effect and Atomic Physics.- 1.
Introduction.- 1.1. General Expression for the Hanle Signal in
Terms of the Density Matrix.- 2. Spectroscopic Applications.- 2.1.
Determination of Atomic Constants.- 2.2. Measurements of
Laser-Level Populations.- 2.3. Increasing Resolution, Subnatural
Linewidth Effects.- 2.4. Forward Scattering, Line Crossing.- 2.5.
Technical Applications.- 3. Collisions.- 3.1. Hanle Effect with
Collisional Excitation.- 3.2. Hanle Effect and Optogalvanic
Detection.- 3.3. Collision-Induced Hanle Resonances.- 3.4.
Fluctuation-Induced Hanle Resonances.- 4. Hanle Effect in Strong
Laser Fields.- 4.1. General Characteristic.- 4.2. Specific
Situations.- 4.3. Hanle Effect and Nonlinear Optics.- 5. Hanle
Effect in Quantum Optics.- 5.1. Dressed-Atom Model.- 5.2. Hanle
Effect with Fluctuating Fields.- 5.3. Squeezing in the Hanle
Effect.- References.- 3 The Hanle Effect and Level-Crossing
Spectroscopy on Molecules.- 1. Introduction.- 2. Molecular
Level-Crossing Signal.- 3. Comparison with Quantum Beat
Experiments.- 4. Excitation of Molecules.- 5. Lifetime
Investigations.- 6. Lande g-Factors.- 7. Electric-Field Level
Crossing.- 8. Stark-Zeeman Recrossing and High-Field Level
Crossing.- 9. Hanle Effect on NO2.- 9.1. The Influence of Detection
Geometry.- 9.2. Details of the Hanle-Effect Signal.- 9.3.
Collisions.- 9.4. Discussion of Hanle-Effect Experiments on NO2.-
10. Conclusion.- References.- 4 The Nonlinear Hanle Effect and Its
Applications to Laser Physics.- 1. The Nonlinear Hanle Effect and
Its Experimental Observation.- 2. Saturation Intensity and
Saturated Linewidth.- 3. The Three-Level Case: Homogeneously
Broadened Lines.- 4. The Three-Level Case: Doppler-Broadened Lines
and the Rate Equations.- 5. The General Case.- 6. The Rate-Equation
Approach to the Nonlinear Hanle Effect in Inhomogeneously Broadened
Transitions.- 7. The Nonlinear Hanle Effect with a Gaussian Laser
Beam.- 8. The Nonlinear Hanle Effect in Absorption.- 9. The
Nonlinear Hanle Effect in Laser-Active Media.- 9.1. The He-Ne
Laser.- 9.2. The Xe Laser.- 9.3. The He-CdII and He-ZnII Lasers.-
9.4. The Noble-Gas Ion Lasers.- 9.5. Optically Pumped Far-Infrared
Lasers.- 9.6. Other Lasers.- 9.7. Conclusions.- References.- 5
Applications of the Hanle Effect in Solar Physics.- 1.
Introduction.- 2. Brief Review of the Properties of Solar Magnetic
Fields.- 3. Overview of the Diagnostic Possibilities and
Limitations of the Hanle Effect.- 4. Basic Theoretical Concepts for
Applications in Astrophysics.- 5. Diagnostics of Magnetic Fields in
Solar Prominences.- 6. Survey of Scattering Polarization on the
Solar Disk.- 7. Diagnostics of Turbulent Magnetic Fields.- 8.
Diagnostics of Magnetic Fields in the Chromosphere-Corona
Transition Region and Above.- 9. Concluding Remarks.- References.-
6 Applications of the Hanle Effect in Solid State Physics.- 1.
Introduction.- 2. The Hanle Effect on Free Electrons.- 2.1. Optical
Orientation of Electron Spins.- 2.2. Occurrence of Electron-Nucleus
Interaction in Polarized Luminescence.- 2.3. Optical Alignment of
Electron Momenta in a Magnetic Field.- 3. The Hanle Effect on
Excitons.- 3.1. The ?8 x ?6 and ?7 x ?6 Excitons in Cubic
Crystals.- 3.2. The ?9 x ?7 and ?7 x ?7 Excitons in Hexagonal II-VI
Crystals with Wurtzite Structure.- 3.3. The ?7 x ?8 Excitons in
III-VI Crystals with Symmetry Class D3h.- 3.4. The Influence of
Reemission on the Hanle Effect.- 3.5. Hot Excitons and Polaritons.-
4. The H
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