Photoelectron Angular Distributions Seminar Series (April 2010), part 1 of 3<div><br></div><div>A general overview of scattering theory and angular momentum, as applied to photoionization.</div><div><br></div><div>Originally given at the National Research Council of Canada, April 2010.</div><div><br></div><div>(Full set at https://dx.doi.org/10.6084/m9.figshare.c.3511731.v1)</div>