Photodesorption via Laser-Adsorbate Coupling
A laser beam impinging onto an adsorbate covered surface of a solid can deposit part or all of its energy (i) into the solid directly, heating it up, rapidly leading to laser-induced thermal desorption [1–6]. (ii) The laser energy can be coupled into the surface bond with which the adsorbed molecule is bound to the surface [7–8]. This process is resonant in character in that the laser frequency must match one with which the adsorbate molecule “vibrates” with respect to the surface. If enough energy can be deposited into the surface bond it might rupture leading to photodesorption by resonant laser-surface bond coupling. It has not been achieved experimentally yet. (iii) The laser can also be coupled resonantly into some internal degree of freedom of the adsorbed molecule, be it an electronic or vibrational mode. Photodesorption of molecules by resonant laser-molecular vibrational coupling, proposed in reference , has been realized experimentally in several gas-solid systems.
KeywordsLaser Intensity Thermal Desorption Laser Fluence Surface Bond Brational Mode
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