Abstract

Laser-induced desorption of methyl fluoride from a polycrystalline copper surface has been achieved by either direct excitation of the γ₃ vibrational mode of adsorbed methyl fluoride using a pulsed CO₂ laser at 10μ or via heating of the copper substrate using a KrF excimer laser operating at 248 nm. We have previously demonstrated that at ultraviolet wavelengths, the reflectivity of copper is low enough that the KrF laser pulse of ~ 200 mJ deposits enough energy into the surface to desorb CO from either single crystal (100) or polycrystalline copper [1]. Time-of-flight (TOF) spectra have been characterized with respect to the CO translational velocity as a function of laser power density and CO coverage [2]. In the present work, preliminary results of such measurements are presented for the CH₃F-Cu system.

© 1985 Optical Society of America