This award from the Academic Research Infrastructure (ARI) Program will assist the Department of Chemistry at Yale University acquire a laser system. This equipment will enhance research in a number of areas including the following: (1) time-resolved two-photon photoelectron and photofragmentation spectroscopies of mass selected negative ions (2) liquid dynamics and solvation probed with fs THz pulse spectroscopy (3) non-linear spectroscopy of microdroplets, and (4) nonlinear spectroscopic probes of photo-induced molecular dynamics and the optical properties of novel materials. A tunable laser can provide important information about chemical reactivity. Its use may enable breakthroughs in our understanding of the properties of reactive and nonreactive molecules.