Book excerpt: Progress in Analytical Atomic Spectroscopy, Volume 3 presents the advancement in the study of the electromagnetic radiation that atoms absorb and emit. The book first explores the nuclear energy materials, and then discusses the thermodynamic study of gaseous monocyanides through electrothermal atomic absorption spectrometry. The multielement atomic fluorescence spectroscopy and the analytical atomic spectroscopy of metallurigical materials are then tackled. The text also looks into a theoretical approach to the analytical capabilities of atomic spectrometric techniques utilizing tunable lasers. The latter parts explain the analytical applications of spectra of diatomic molecules; the chemical reactions in atom reservoirs used in atomic absorption spectroscopy; and the Zeeman effect atomic absorption. The text will be helpful to those interested in analytical atomic spectroscopy.