| Autor: |
Sven Neukermans, Ewald Janssens, Erno Vandeweert, Andreas Wucher, Roger Silverans, C Staudt, Frederik Vanhoutte, Peter Lievens |
| Rok vydání: |
2002 |
| Předmět: |
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| Zdroj: |
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 193:787-793 |
| ISSN: |
0168-583X |
| Popis: |
The internal energy distribution of neutral indium clusters Inn sputtered from a polycrystalline In surface by 15 keV Xe+ ions is investigated by means of laser post-ionization and time-of-flight mass spectrometry. In particular, the neutral species are ionized by a tunable frequency doubled dye-laser and the photoionization efficiency (PIE) curves were collected with the photon energy varied around the ionization potential. This way, internal energy distributions of sputtered clusters in the size range n=2–35 could be determined using photon energies of 4.2–6 eV. The results are compared with the PIE curves of cold indium clusters which were produced by a supersonic nozzle expansion using a laser vaporization source and investigated under otherwise similar conditions. As a result, the sputtered clusters show a distinctive broadening of the PIE curve in the threshold region, thus illustrating the influence of the sputtering process in increasing the internal energy of the ejected clusters. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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