Titlebook: Quantum Mechanics; An Introduction Walter Greiner Textbook 2001Latest edition Springer-Verlag Berlin Heidelberg 2001 curvilinear coordinate

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The Radiation Laws,yleigh-Jeans radiation law accounted for experiments in the region of longwave radiation; Wien’s law for those in the region of short-wave radiation. By introducing a new constant ., Planck was successful in finding an interpolation between the two laws.

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The Harmonic Oscillator,that such a potential is of greater importance, because many complicated potentials can be approximated in the vicinity of their equilibrium points by a harmonic oscillator. Expanding a potential .(.) in one dimension in a Taylor series yields

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Perturbation Theory,rturbation theory is applied to those cases in which the real system can be described by a small change in an easily solvable, idealized system. The Hamiltonian of the system is then of the form . where . and . do not differ very much from each other. . is called the .; the perturbation . (i.e. the

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