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Thank you for the Quantum Theory PDF link atyy, this is quite interesting.
The only missing information is the experimental basis for Einstein's conclusion
that the Helium atom is a classically non-integrable system.
"In 1917, Albert Einstein pointed out that the Bohr–Sommerfeld...
Hello,
As a science writer, I've tasked myself with acquiring a thorough theoretical and historical understanding
of Quantum Mechanics.
It would be interesting to know if there has ever been any experimental verification of Laplace's
spherical harmonics, relating to the quantum mechanical...