Arnold Johannes Wilhelm Sommerfeld, was a German theoretical physicist who pioneered developments in atomic and quantum physics, and also educated and mentored many students for the new era of theoretical physics. He served as doctoral supervisor for many Nobel Prize winners in physics and chemistry .
He introduced the second quantum number and the third quantum number . He also introduced the fine-structure constant and pioneered X-ray wave theory. Wikipedia
“If I knew something about it, I wouldn’t lecture on it!”
As quoted in: Cassidy, David C., Uncertainty: The Life and Science of Werner Heisenberg (W. H. Freeman and Company, 1992), p. 104.
As quoted in: J.Muller, Physical Chemistry in Depth (Springer Science & Business Media, 1992), p. 1. No primary source is given in that book.
Disputed
