This monograph reviews the recent progress in vacuum ultraviolet (VUV) photoionization and photodissociation processes. Photoionization, photoelectron, and fluorescence spectroscopic techniques have played an important role in revealing the photoionization and photodissociation dynamics of molecules in the vacuum ultraviolet region and in providing accurate energetic and spectroscopic information of ions as well as neutral molecules. The book represents the first detailed review of major experimental developments in the studies of single vacuum ultraviolet photon ionization and dissociation processes of gaseous molecules and clusters. Contents:Photoionization Mass Spectrometric Studies of Free Radicals (J Berkowitz & B Ruscic)Photoelectron Spectroscopy of Short-Lived Molecules (J M Dyke et al.)Photoelectron-Photoion Coincidence Studies of Ion Dissociation Dynamics (T Baer et al.)Applications of Coherent Vacuum Ultraviolet to Photofragment and Photoionization Spectroscopy (J W Hepburn)Photon Transfer in Ionic States of Hydrogen-Bonded Dimers: A Photoelectron Spectroscopic Approach (S Tomoda & K Kimura)Spectroscopy and Reaction Dynamics Using Ultrahigh Resolution VUV Lasers (A H Kung & Y T Lee)Molecular Beam Photoionization and Photoelectron-Photoion Coincidence Studies of High Temperature Molecules, Transient Species, and Clusters (C Y Ng)Dispersed Fluorescence as a Probe of Molecular Photoionization Dynamics (E D Poliakoff)Absorption and Fluorescence Studies of Molecules and Clusters (K Shobatake et al.)Vibrationally Resolved Photoelectron Angular Distribution and Branching Ratios (J B West) Readership: Physical chemists. keywords: