Haas, Arthur Erich [key], 1884–1941, American physicist and educator, b. Bohemia. He was professor of physics at Vienna, Leipzig, London, and, from 1936, the Univ. of Notre Dame, South Bend, Ind. After first doing work in the history of science, he turned in 1909 to theoretical physics and made a number of proposals in the field of atomic physics, anticipating Bohr's theory of the atom. In 1920 he derived formulas for the isotope effect in rotational spectra. His writings include Wave Mechanics and the New Quantum Theory (1928).
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