Multiphoton ionization spectroscopy is a tool for the elucidation of t
he structure of high-energy states of atoms and molecules. Particularl
y when used in combination with time-of-flight mass spectrometry and p
hotoelectron spectroscopy, the range of applications include pure spec
troscopic studies, the quantum state specific detection of reactants a
nd products and the preparation of quantum-state-selected reactants fo
r chemical reactivity studies. As such, the techniques have become ubi
quitous in the field of chemical reaction dynamics. This paper is conc
erned mainly with the describing the range of these applications and t
echniques and a selection of typical results.