Erich Armand Arthur Joseph Hückel was a German physicist and physical chemist. He is known for two major contributions:The Debye–Hückel theory of electrolytic solutions
The Hückel method of approximate molecular orbital (MO) calculations on π electron systems.
Erich Hückel in 1938
Above Rudolf Hilsch and Otto Scherzer, in front Erich Hückel, 1935 at Stuttgart
Peter Joseph William Debye was a Dutch-American physicist and physical chemist, and Nobel laureate in Chemistry.
Debye in 1912
Monument for Peter Debye in the Maastricht square that bears his name: Dipole moments (Felix van de Beek, 1998)