Summary
We show, by means of an example, that good estimates can be obtained for the energy levels of one-dimensional quantum systems where the potential has all bound states. The calculation uses a semi-classical expression to determine the energy levels where the classical periodic states are evaluated using the method of harmonic balance.
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Mickens, R.E. Semi-classical quantization using the method of harmonic balance. Nuov Cim B 101, 359–365 (1988). https://doi.org/10.1007/BF02828714
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DOI: https://doi.org/10.1007/BF02828714