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Before the explosion of computational physics and the widespread availability of numerical solvers, theoretical physicists relied on rigorous analytic methods. Charles J. Joachain, a Belgian theoretical physicist known for his work on atomic collisions and the electron-atom scattering problem, identified a critical gap in the 1970s literature. quantum collision theory joachain pdf
At the time, there were excellent books on non-relativistic quantum mechanics (like Schiff or Messiah) and specialized texts on field theory. However, scattering theory—the formal framework for collisions between electrons, protons, neutrons, or photons—was scattered across disparate journal articles. Joachain set out to unify this field. A Google search for "quantum collision theory joachain
The result, Quantum Collision Theory (North-Holland, 1983; later reprinted by Elsevier), is a towering achievement. It bridges the gap between the abstract formalism of scattering theory and the practical calculations needed to predict experimental outcomes. Before the explosion of computational physics and the