Contents vii
§37. Physical meaning of the solutions ψ1 and ψ2 164
§38. Scattering by a rectangular barrier 167
§39. Scattering by a potential center 169
§40. Motion of wave packets in a central force field 175
§41. The integral equation of scattering theory 181
§42. Derivation of a formula for the cross-section 183
§43. Abstract scattering theory 188
§44. Properties of commuting operators 197
§45. Representation of the state space with respect to a
complete set of observables 201
§46. Spin 203
§47. Spin of a system of two electrons 208
§48. Systems of many particles. The identity principle 212
§49. Symmetry of the coordinate wave functions of a system
of two electrons. The helium atom 215
§50. Multi-electronatoms. One-electronapproximation 217
§51. The self-consistent field equations 223
§52. Mendeleev’s periodic system of the elements 226
Appendix: Lagrangian Formulation of Classical Mechanics 231
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