Microscopic atomic physics by Newtonian trajectories

by Luigi Galgani (Università di Milano )

Monday 18 May 2020, 14:00 → 16:00 Europe/Rome

Aula Conversi (Dipartimento di Fisica - Ed. G.Marconi)

IL SEMINARIO E' STATO RIMANDATO A DATA DA DESTINARSI.

(Il seminario sara` presentato in collaborazione con Andrea Carati, Univ. di Milano)
Original form of the correspondence principle challenged by Newtonian
trajectories which reproduce the phenomenology in deep quantum regimes; 
1) Infrared spectra of ionic crystals (model: ions with given effective
potentials), 
2) Chemical bond in H2 + ion (model: two protons and one
electron, purely Coulomb potentials).  Then we show why, in a classical
frame, electrons donât fall on nuclei and ions donât come to rest, by
radiation. Reason is Wheeler-Feynman identity, which was recently
proven. Application: Existence of polaritons (a bifurcation in dispersion
relations of ionic crystals, due to retardation), whose proof is not yet
available in a quantum frame.