Abundances of Tetra-, Penta-, and Hexa-Anionic Gold Clusters
| Autor: | Franklin Martinez, Lutz Schweikhard, Gerrit Marx, Steffi Bandelow, Albert Vass |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
biology
Chemistry Analytical chemistry Thermionic emission Electron biology.organism_classification HEXA Penning trap Surfaces Coatings and Films Electronic Optical and Magnetic Materials Field electron emission General Energy Chemical physics Tetra Physical and Theoretical Chemistry Quantum tunnelling Excitation |
| Zdroj: | The Journal of Physical Chemistry C. 119:10949-10957 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | Tetra-, penta-, and hexa-anionic gold clusters have been produced in a Penning trap. Their abundances have been investigated as a function of cluster size, and critical sizes have been determined for each charge state. Previous descriptions of the polyanion abundance by means of field emission on the one hand, and by thermionic emission on the other hand, are extended to a temperature-dependent field-emission model. The latter provides an improved explanation of experimental data, in particular for tetra- and penta-anionic gold clusters. Although the present approach is still based on a temperature concept from the bulk, it demonstrates the advantage of combining both the thermal excitation of electrons and the tunneling process in the description of stability of multiply negatively charged metal clusters with respect to electron emission. |
| Databáze: | OpenAIRE |
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