Abstract
Laser excitation of overtone vibrations is a useful technique for selectively preparing molecules for state-selected unimolecular reaction studies. In addition, these studies provide new data on overtone vibration transitions in the excited molecules. Data obtained from state-selected unimolecular decay experiments and photoacoustic measurements provide local mode parameters for overtone vibrations in tetramethyldioxetane, t-butylalcohol, t-butylhydroperoxide, and hydrogen peroxide.