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- 1.
I took these values from the lecture notes of Professor Klaus Schulten on the web site http://www.ks.uiuc.edu/Services/Class/PHYS480/.
- 2.
L.F. Barrágan-Gil and A. Camacho, Modern Physics Letters 22, 2675–2687 (2007) prove that a lower bound to the ground state energy can be obtained using WKB considerations for potentials that vary as x q for x > 0 and are infinite for x < 0, provided 1 < q < 5/2. However the lower bound they obtain is lower than that which would be calculated using the WKB quantization condition.
- 3.
See H. Friedtich and J. Trost, Nonintegral Maslov indices, Physical Review A 54, 1136–1145 (1996). I thank R. Shakeshaft for pointing out this reference to me.
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Berman, P.R. (2018). WKB Approximation. In: Introductory Quantum Mechanics. UNITEXT for Physics. Springer, Cham. https://doi.org/10.1007/978-3-319-68598-4_16
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