Van Vleck developed during the early 1930s the first fully articulated
quantum mechanical theory of magnetism. Later he was a chief architect
of the ligand field theory of molecular bonding. He contributed also
to studies of the spectra of free molecules, of paramagnetic relaxation,
and other topics. His publications include Quantum Principles and Line
Spectra (1926) and The Theory of Electric and Magnetic Susceptibilities
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