Rotational alignment in the UV-laser induced desorption of CO from Cr2O3(0001)

Beauport, I.; Al-Shamery, K.; Freund, Hans-Joachim

doi:10.1016/0009-2614(96)00495-2

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Rotational alignment in the UV-laser induced desorption of CO from Cr₂O₃(0001)

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Beauport, I., Al-Shamery, K., & Freund, H.-J. (1996). Rotational alignment in the UV-laser induced desorption of CO from Cr₂O₃(0001). Chemical Physics Letters, 256(6), 641-648. doi:10.1016/0009-2614(96)00495-2.

Cite as: https://hdl.handle.net/21.11116/0000-0009-B948-6

Abstract

The rotational alignment of the laser-induced non-thermal desorption of CO adsorbed on an epitaxially grown film of Cr₂O₃(0001) has been studied using 193 nm (6.4 eV) laser light and a (1 + 1′)-REMPI technique. At low rotational quantum numbers J the molecules desorb like a ‘helicopter’ (J-vector perpendicular to the surface) while at high J-values a ‘cartwheel’ like motion is preferred (J-vector parallel to the surface). CO is adsorbed in a flat geometry as a single species. The resulting angular momentum alignment in the laser desorption is interpreted qualitatively as a sum of effects due to corrugation of the surface in the initial state and a change of the adsorption geometry in the intermediate state before desorption.