Negative ions Ar−, Kr−, and Xe− in superfluid helium
| Autor: | E. V. Lebedeva, P. D. Grigor’ev, A. M. Dyugaev |
|---|---|
| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | JETP Letters. 94:714-718 |
| ISSN: | 1090-6487 0021-3640 |
| DOI: | 10.1134/s0021364011210041 |
| Popis: | The catalogue of negative ions in superfluid helium has been extended using the example of Ar−, Kr−, and Xe−. Such objects cannot exist in vacuum, since the polarization attraction of an electron to the inert A atom is insufficient for the formation of the bound state A−. However, these objects exist in helium as stable or metastable with a very long lifetime. The effect is due to the electron localization in liquid helium. If a mixture of excited A* atoms and electrons is prepared in the gas phase above liquid helium, the reaction A* + e = A*− becomes possible for all atoms of the periodic table. Such charges can be immersed into liquid helium by the electric field. In this case, the radiative decay A*− = A + e allowed in vacuum can be forbidden in liquid. This leads to the formation of the new unique objects A−, which can exist in liquid helium but are absent in nature. The size of such charged formations has been determined and is close the radius of a usual electron bubble in helium. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|