The man who gave quantum chemistry its own mathematical language
In short: Before the 1960s, quantum mechanics was a tool used by chemists, not a distinct discipline. Per-Olov Löwdin changed that by establishing the rigorous mathematical framework and educational infrastructure required to turn complex physics into a structured field of chemical science.
Löwdin is often credited with transforming quantum chemistry from a collection of cross-disciplinary applications into an independent province of science. Uppsala University granted him its initial quantum chemistry Lehrstuhl during 1960. To establish this new field, he formulated its core goals and fundamental concepts, including correlation energy, configuration interaction, reduced density matrices, and natural spin orbitals. He provided the mathematical rigor necessary for the interpretative organization of the discipline through his work on partitioning techniques and perturbation theory.
His technical contributions remain foundational to modern computational chemistry. Löwdin developed a symmetric orthogonalisation framework for molecular and atomic orbital maths in 1950; this streamlined tight-binding techniques and served as the foundation for semiempirical theories' zero-differential overlap (ZDO) approximation. By 1956, he introduced the canonical orthogonalization scheme, a method still widely used today to eliminate approximate linear dependencies in basis sets.
Beyond equations, Löwdin was a pioneer of scientific infrastructure and pedagogy. He anticipated the significance of computers for chemistry, bringing the first computer to Uppsala University. He founded the International Journal of Quantum Chemistry and the book series Advances in Quantum Chemistry. Perhaps most significantly, he educated two generations of faculty through his Summer Schools in the Scandinavian Mountains and Winter Institutes at Sanibel Island, which initiated hundreds of young scientists into the field.
While often associated with 'Löwdin's pairing theorem,' he clarified that while he provided an informal suggestion, the formal proposition was made by George G. Hall and King.
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Sources
- Summary by Intellect · source: Per-Olov Löwdin
- Also: Per-Olov Löwdin – father of quantum chemistry
- Also: International Journal of Quantum Chemistry — Per‐Olov Löwdin curriculum vitae · CC0 (metadata)
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