Quantum state resolved studies on UV-laser-induced desorption of small molecules from single crystal oxide surfaces

Ingrid Beauport; Katharina H.B. Al-Shamery

doi:10.1117/12.221472

25 September 1995 Quantum-state-resolved studies on UV-laser-induced desorption of small molecules from single crystal oxide surfaces

Ingrid Beauport, Katharina H.B. Al-Shamery

Author Affiliations +

Proceedings Volume 2547, Laser Techniques for Surface Science II; (1995) https://doi.org/10.1117/12.221472
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

The results of a fully quantum state resolved study of the laser-induced desorption of CO from an epitaxially grown film of Cr₂O₃(111)/Cr(110) at a surface temperature of 100 K are reported by using a (1+')REMPI (resonance enhanced multiphoton ionization) detection technique for the desorbing molecules via the B¹(Sigma) ⁺$IMPX¹(Sigma) ⁺ electronic state. In order to get an insight into excitation mechanism the wavelength dependence of the desorption process was studied at 3.5 eV, 5.0 eV, and 6.4 eV. For all three wavelengths we observed nonthermal desorption. The final state distributions did not show any significant changes for the three wavelengths except for the overall intensities. The velocity flux distributions were bimodal for v"equals1. the desorption cross sections measured vary between (5+/- 1)(DOT)10^-18 cm² for 3.5 eV and (3.5+/- 1)(DOT)10^-17 cm² for 6.4 eV. The behavior indicates that the origin of the desorption has to be an indirect process via electronic excitation of the substrate. Possible mechanisms are discussed.

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Ingrid Beauport and Katharina H.B. Al-Shamery "Quantum-state-resolved studies on UV-laser-induced desorption of small molecules from single crystal oxide surfaces", Proc. SPIE 2547, Laser Techniques for Surface Science II, (25 September 1995); https://doi.org/10.1117/12.221472

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