Magic Numbers in Boson <sup>4</sup>He Clusters: The Auger Evaporation Mechanism
The absence of magic numbers in bosonic <sup>4</sup>He clusters predicted by all theories since 1984 has been challenged by high-resolution matter-wave diffraction experiments. The observed magic numbers were explained in terms of enhanced growth rates of specific cluster sizes for which...
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MDPI AG
2021-10-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/26/20/6244 |
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| author | Elena Spreafico Giorgio Benedek Oleg Kornilov Jan Peter Toennies |
| author_facet | Elena Spreafico Giorgio Benedek Oleg Kornilov Jan Peter Toennies |
| author_sort | Elena Spreafico |
| collection | DOAJ |
| description | The absence of magic numbers in bosonic <sup>4</sup>He clusters predicted by all theories since 1984 has been challenged by high-resolution matter-wave diffraction experiments. The observed magic numbers were explained in terms of enhanced growth rates of specific cluster sizes for which an additional excitation level calculated by diffusion Monte Carlo is stabilized. The present theoretical study provides an alternative explanation based on a simple independent particle model of the He clusters. Collisions between cluster atoms in excited states within the cluster lead to selective evaporation via an Auger process. The calculated magic numbers as well as the shape of the number distributions are in quite reasonable agreement with the experiments. |
| first_indexed | 2024-03-10T06:19:46Z |
| format | Article |
| id | doaj.art-0e54fdf841f143e0886db399c19cbb89 |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-10T06:19:46Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-0e54fdf841f143e0886db399c19cbb892023-11-22T19:20:20ZengMDPI AGMolecules1420-30492021-10-012620624410.3390/molecules26206244Magic Numbers in Boson <sup>4</sup>He Clusters: The Auger Evaporation MechanismElena Spreafico0Giorgio Benedek1Oleg Kornilov2Jan Peter Toennies3Department of Materials Science, University of Milano-Bicocca, Via R. Cozzi 53, 20125 Milan, ItalyDepartment of Materials Science, University of Milano-Bicocca, Via R. Cozzi 53, 20125 Milan, ItalyMax-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Straße 2A, 12489 Berlin, GermanyMax-Planck-Institute for Dynamics and Self-Organization, Bunsenstrasse 10, 37073 Göttingen, GermanyThe absence of magic numbers in bosonic <sup>4</sup>He clusters predicted by all theories since 1984 has been challenged by high-resolution matter-wave diffraction experiments. The observed magic numbers were explained in terms of enhanced growth rates of specific cluster sizes for which an additional excitation level calculated by diffusion Monte Carlo is stabilized. The present theoretical study provides an alternative explanation based on a simple independent particle model of the He clusters. Collisions between cluster atoms in excited states within the cluster lead to selective evaporation via an Auger process. The calculated magic numbers as well as the shape of the number distributions are in quite reasonable agreement with the experiments.https://www.mdpi.com/1420-3049/26/20/6244Van der Waals bondshelium clustersAuger evaporationmagic numberscluster supersonic jets |
| spellingShingle | Elena Spreafico Giorgio Benedek Oleg Kornilov Jan Peter Toennies Magic Numbers in Boson <sup>4</sup>He Clusters: The Auger Evaporation Mechanism Molecules Van der Waals bonds helium clusters Auger evaporation magic numbers cluster supersonic jets |
| title | Magic Numbers in Boson <sup>4</sup>He Clusters: The Auger Evaporation Mechanism |
| title_full | Magic Numbers in Boson <sup>4</sup>He Clusters: The Auger Evaporation Mechanism |
| title_fullStr | Magic Numbers in Boson <sup>4</sup>He Clusters: The Auger Evaporation Mechanism |
| title_full_unstemmed | Magic Numbers in Boson <sup>4</sup>He Clusters: The Auger Evaporation Mechanism |
| title_short | Magic Numbers in Boson <sup>4</sup>He Clusters: The Auger Evaporation Mechanism |
| title_sort | magic numbers in boson sup 4 sup he clusters the auger evaporation mechanism |
| topic | Van der Waals bonds helium clusters Auger evaporation magic numbers cluster supersonic jets |
| url | https://www.mdpi.com/1420-3049/26/20/6244 |
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