SIMILARITY OF WIGNERS DELAY TIME TO THE VIRIAL THEOREM FOR SCATTERING BY A CENTRAL FIELD

The quantum-mechanical virial theorem for scattering of a particle by a central force is expressed in terms of Wigner's definition of time delay, τ=2dηdE. By using semiclassical approximations, the quantum-mechanical virial is transformed into the classical virial and τ becomes exactly the classical delay time. © 1979 The American Physical Society.