Scattering of neutral NH3 clusters off LiF(100): angular distributions of NH3 and small clusters |
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Authors: | C Menzel A Knöner J Kutzner H Zacharias |
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Institution: | 111. Institut für Laser und Plasmaphysik, Universit?t/GH Essen, D-45117, Essen, Germany
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Abstract: | The scattering behavior of neutral ammonia clusters off a LiF(100) surface is studied. Ammonia clusters are produced by a coexpansion of NH3 and Kr with an average kinetic energy of 48 meV per monomer molecule. Using single photon VUV laser ionization at λ = 118 nm (hv = 10.49 eV) the mass distribution of scattered particles is obtained in a reflecting time-of-flight mass spectrometer. Compared with the incoming cluster beam the average cluster size of the scattered particles is drastically decreased. The angular distribution of NH 3 + and NH 4 + after scattering reveals a strong inelastic interaction between the clusters and the LiF(100) surface which is described in the context of a thermokinetic model and a phonon excitation along the (001) azimuth of the LiF(100) surface. |
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