Ground-state characteristics of helium–alkali tetramers
| Autor: | Leandra Vranješ Markić, Petar Stipanović |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Physics
Condensed Matter::Quantum Gases 010304 chemical physics Quantum Monte Carlo Doping chemistry.chemical_element Condensed Matter Physics Alkali metal 01 natural sciences Molecular physics Atomic and Molecular Physics and Optics chemistry Tetramer halo states four-body helium-alkali clusters structure ground-state quantum Monte Carlo 0103 physical sciences Atom Physics::Atomic and Molecular Clusters Diffusion Monte Carlo Physics::Atomic Physics 010306 general physics Ground state Helium |
| Popis: | Helium–alkali tetramers 4He3 A, 3He 4He2 A and 3He2 4He A, where A is one of the alkali atoms 6, 7Li, 23Na, 39, 40, 41K, 85, 87Rb or 133Cs, were studied using diffusion Monte Carlo method. Besides ground-state energies, exact distribution functions were evaluated. Spatial arrangements of atoms in clusters qualify He–A tetramers as transitional systems, which reveal halo-like spatial extension. On the one hand, swapping 4He by3 He atom in a He–Li tetramer, one can trace how quasi-halo structure transforms into halo structure. On the other hand, swapping 3He by 4He in He–A tetramer reveals behavior previously noticed in helium droplets doped with an alkali atom. Helium atoms start grouping on one side of an alkali atom, which is clearer in He–A clusters with more 4 He atoms that have stronger self- binding. The effect is the more pronounced the bigger alkali atom is, since it is then harder for the remaining He atoms to surround an alkali. |
| Databáze: | OpenAIRE |
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