"For Schrödinger, the atom was an oscillating system -- like the string of a musical instrument -- for which there exist a number of modes of oscillation (fundamentals and overtones) which are interpreted as the atom's energy states. Schrödinger's wave equation impressively provided -- without any additional assumptions -- the right values for spectral lines of the hydrogen atom."
Armin Hermann. Werner Heisenberg 1901-1976, pg. 36. 1976.

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