The Valence Bond Approximation in Crystals — Application to an Analysis of the Ultraviolet Spectrum in Quartz

Chapters in this book

1. Frontmatter I
2. Contents 449
3. Review Article
4. Diffusion Mechanisms and Point Defects in Silicon and Germanium 455
5. Original Papers
6. Stability of the Dislocation Dipole in Half-Space 543
7. An Infrared Spectrophotometric Study of Yitreous Selenium Doped with Selenium Dioxide 551
8. Anisotropy of High-Field Helicon Propagation in PbTe 559
9. Dislocation Mobility in the {1122} <1123> Slip System of Zinc Single Crystals 569
10. Hyperfine and Quadrupole Interactions of the F-Centre in KCl as Measured by ENDOR 575
11. One-Phonon Relaxation of Hydroxyl Ions in Alkali Halide Crystals 587
12. PEM Effect with Short-Circuited Dember Yoltage 597
13. The Valence Bond Approximation in Crystals — Application to an Analysis of the Ultraviolet Spectrum in Quartz 605
14. Low-Temperature Elastic Constants and Specific Heats of F.C.C. Nickel-Iron Alloys 617
15. Herstellung dünner Bor-Folien und elektronenmikroskopische Beobachtung ihrer Baufehler 627
16. Vibrational Spectra of U₁-Centres in KI 639
17. Nonlinear Magnetooptical Phenomena in Semiconductors (I) 645
18. Contrast Asymmetries in Lang Topographs of Crystals Strained by Thin Films 653
19. Surface Layers of Triglycine Sulfate Single Crystals 669
20. The Study of Deformation of Thin Foils of Mo under the Electron Microscope 675
21. The Study of Slip Bands on the Surface of Mo Single Crystals 685
22. High Resolution Study of Crystal Field Lines in the Far Infra-Red 697
23. Phonon-Assisted Exciton Transitions in A^IIB^VI Semiconductors 707
24. Temperature Dependence of Laser Threshold Current Density and Emission Spectra in Electron-Beam Pumped Gallium Arsenide Lasers 715
25. Observations de sources et de réactions entre dislocations partielles de macle sur des topographies aux rayons X 725
26. Phonon-Induced Hyperfine Coupling of V ²⁺ Ion in Cubic Crystalline Fields 737
27. The Low-Temperature Thermoelectric Power and Thermal Conductivity of GeTe and of Some GeTe-MnTe Alloys 743
28. Scattering Effects with Channeled Ions 755
29. Exoemission of Electrons without Photostimulation 761
30. Die kritische Schubspannung mit zweiwertigen Kationen dotierter Alkalihalogenide 767
31. The Measurement of the Anisotropy Constant of Antiferromagnetic FeP04 by Means of the Mössbauer Effect 781
32. Effect of Heat Treatments on GaAs Luminescence 793
33. Mainly on the Fresnel Mode in Lorentz Microscopy 799
34. Conduction Bands of GaSlb-InSb Mixed Crystals with a Low Concentration of InSb 807
35. Energy Band Structure of Zn_xHg _1-x Te Solid Solutions 813
36. Low-Temperature Neutron Radiation Damage and Recovery in Beryllium 819
37. Magnetic Properties of Some Co-Rich Erbium Cobalt Intermetallic Compounds 825
38. On the Nature of the Colour Centres of Ruby 831
39. Temperature Dependence of Hyperfine Interactions in Near-Stoichiometric FeS 837
40. Optical Absorption of Mn ²⁺ -Doped Alkali Halides 847
41. Polymorphism of Rubidium Nitrate 859
42. Calculation of the Generalized Grüneisen Parameters for Acoustic Waves in Uniaxial Crystals from the Third Order Elastic Constants 865
43. Fault Structures in Ti₂O 873
44. Erratum 891
45. Short Notes
46. Induced Impurity Breakdown Oscillations and Observation of Traps Lying Higher than the Indirect Band Edge in GaP 899
47. Electron Microprobe and Scanning Electron Microscope Investigations on Plate-Shaped CdS Single Crystals 903
48. Double Diffraction in Epitaxially Grown Nickel Polycrystalline Films 905
49. Grain Growth in Thin Films of TbO₂, NpO₂, and PuO₂ 909
50. Mossbauer Effect Study in Chalcopyrite 913
51. Magnetic Field Influence on the Low-Frequency Oscillations of Gunn Diodes 917
52. Growth and Bleach of F-Centers in KCl with Interstitial Cobalt 921
53. On the Determination of Impurity Concentration in the Alloyed Region of a Tunnel Diode 925
54. On the Internal Barkhausen Effect 931
55. Effects of Fission Fragments on Electric Properties of the UO₂ -SiO₂ System 933
56. Messung der Aktivierungsenergien der Versetzungsverankerung in Kupfer nach Elektronenbestrahlungen bei 78 °K 937
57. Défauts d'irradiation dans l'uranium ou et règle de Matthlessen 941
58. Self-Vibrations of Parallel Edge PiBlocations 947
59. On the Kinetics of Clustering in a Magnesium-3%Zinc Alloy 951
60. Indentation Creep in Crystals 955
61. On the Relation between Microhardness and Point Defects of Crystals 959
62. Thermocurrents in Paraselectric BaTiO₃ 963
63. Photocurrent Amplification by a Magnetic Field 967
64. Determination of Integrated Absorption in ESR Measurements 971
65. Piezoelektrisches und elektrisches Verhalten von Lithiumjodat 973
66. Investigation of Non-Conductive Second Phases by Means of the Shape Factor of Electrical Resistance 977
67. On the Conduction Mechanism in the Instable Range of a Double Injection Diode 981
68. Temperature Dependence of the Magnetic Ordering in Gd-GdFe₂ Phase Mixtures 985
69. The Influence of External Optical Coupling on the Threshold Current Density of GaAs Injection Lasers 989
70. Point Defects in Iron-Carbon Solid Solution Studied by Magnetic After-Effect Measurements 993
71. Optical Constants of Crystalline CaB₆ 997
72. Pre-printed Titles 1001