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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