Fundamental Notions of Quantum Mechanics

Abstract

According to Wave Mechanics, a pure state¹ of a mechanical system is defined at any time by a wave function Ψ. The mechanical systems considered in this book are systems such as atoms or molecules, each consisting of a finite number of particles (electrons and nuclei). The wave function Ψ is a complex-valued function of the coordinates of the particles, dependent on time, which is supposed to satisfy Schrödinger’s equation

$$ H\Psi + \frac{h}{i}\frac{{\partial \Psi }}{{\partial t}} = 0 $$

(1.1)

.