UV-laser-induced desorption of NO from the pure and modified Cr2O3(0001) surfaces: spin effects in surface-state-induced desorption

Markus Wilde; Katharina H.B. Al-Shamery; Hans-Joachim Freund

doi:10.1117/12.307128

30 April 1998 UV-laser-induced desorption of NO from the pure and modified Cr₂O₃(0001) surfaces: spin effects in surface-state-induced desorption

Markus Wilde, Katharina H.B. Al-Shamery, Hans-Joachim Freund

Author Affiliations +

Proceedings Volume 3272, Laser Techniques for Surface Science III; (1998) https://doi.org/10.1117/12.307128
Event: Optoelectronics and High-Power Lasers and Applications, 1998, San Jose, CA, United States

Abstract

We shall report the UV-laser induced desorption of NO/Cr₂O₃(0001) and the coadsorbate system NO/K/Cr₂O₃(0001). Resonance enhanced multiphoton ionization was used for state selective detection of the desorbing NO after excitation with pulses of nanosecond duration and desorption laser energies between 3.5 eV and 6.4 eV. There are two adsorbate species of NO, a chemisorbed and a physisorbed species. We shall focus on data of the chemisorbed species. The main emphasis within this paper will be put on electron spin effects, particularly the preferential population of a fast translational desorption channel for the ²(Pi) _3/2 state observed specifically in connection with surface state induced processes at desorption energies of 5.0 eV. For those processes changes within the final state distributions of desorbing NO are fond when modifying the electronic surface structure via adsorption of small amounts of potassium.

Citation Download Citation

Markus Wilde, Katharina H.B. Al-Shamery, and Hans-Joachim Freund "UV-laser-induced desorption of NO from the pure and modified Cr₂O₃(0001) surfaces: spin effects in surface-state-induced desorption", Proc. SPIE 3272, Laser Techniques for Surface Science III, (30 April 1998); https://doi.org/10.1117/12.307128

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