Infrared laser-induced photodesorption and ultraviolet laser-induced thermal desorption of methylfluoride and carbon monoxide from polycrystalline copper

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Abstract
Preliminary results of CO2 laser-induced photodesorption and KrF excimer laser-induced thermal desorption of methylfluoride from mixtures with carbon monoxide coadsorbed on polycrystalline copper surfaces are reported. The data indicate that selective desorption of CH3F in the presence of CO-coadsorbate is feasible by thermal desorption using a KrF pulse laser, due to differences in absorbed laser power density desorption threshold of the coadsorbate components. Photodesorption of CH3F is accomplished by vibrational excitation of the ν3 mode of adsorbed CH3F, while simultaneous desorption of CO is not observed.

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