Photodesorption of ammonia from GaAs(100) and Cu(111))

Karl-Heinz Bornscheuer; Winfried Nessler; Kurt W. Kolasinski; Tobias Hertel; Martin Wolf; Eckart Hasselbrink

doi:10.1117/12.221474

25 September 1995 Photodesorption of ammonia from GaAs(100) and Cu(111))

Karl-Heinz Bornscheuer, Winfried Nessler, Kurt W. Kolasinski, Tobias Hertel, Martin Wolf, Eckart Hasselbrink

Proceedings Volume 2547, Laser Techniques for Surface Science II; (1995) https://doi.org/10.1117/12.221474
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

The laser-induced desorption of ammonia from GaAs(100)-(4X6) and Cu(111) has been studied using (2+1)-photon resonance-enhanced multiphoton ionization as a state specific probe. A surprisingly marked isotope effect (NH₃/ND₃) in the photodesorption cross section of ammonia from GaAs(100) had indicated that internal degrees of freedom play a crucial role in the desorption dynamics. We find that NH₃ desorbs with a mean translational energy, (E_trans), of 300 K and 600 K for GaAs(100) and Cu(111), respectively. The average extent of vibrational excitation is about 1000 K. The rotational temperatures are 520 and 170 K. These results are interpreted in terms of a direct mechanism for NH₃ desorption in which a reaction path which initially follows the internal v₂ coordinate and then bends towards desorption is dominating. A marked unequal population of the inversion symmetry doublet states is observed.

Citation Download Citation

Karl-Heinz Bornscheuer, Winfried Nessler, Kurt W. Kolasinski, Tobias Hertel, Martin Wolf, and Eckart Hasselbrink "Photodesorption of ammonia from GaAs(100) and Cu(111))", Proc. SPIE 2547, Laser Techniques for Surface Science II, (25 September 1995); https://doi.org/10.1117/12.221474

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