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# Introduction

In this chapter, we shall investigate the interaction of a non-relativistic particle of mass and energy with various so-called central potentials, , where is the radial distance from the origin. It is, of course, most convenient to work in spherical polar coordinates--, , --during such an investigation (see Sect. 8.3). Thus, we shall be searching for stationary wavefunctions, , which satisfy the time-independent Schrödinger equation (see Sect. 4.12)
 (622)

where the Hamiltonian takes the standard non-relativistic form
 (623)

Richard Fitzpatrick 2010-07-20