This e-book has advanced from lectures dedicated to functions of the Wentzel - Kramers – Brillouin- (WKB or quasi-classical) approximation and of the tactic of 1/N -expansion for fixing a variety of difficulties in atomic and nuclear physics. The cause of this ebook is to assist scholars and investigators during this box to increase their wisdom of those vital calculation equipment in quantum mechanics. a lot fabric is contained herein that's not to be came upon somewhere else. WKB approximation, whereas constituting a primary region in atomic physics, has no longer been the point of interest of many books. a unique strategy has been followed for the presentation of the subject material, the cloth is gifted as a succession of difficulties, by means of an in depth method of fixing them. The tools brought are then used to calculate Rydberg states in atomic platforms and to judge strength boundaries and quasistationary states. ultimately, adiabatic transition and ionization of quantum structures are coated.
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