Naslov
Ground-state characteristics of helium–alkali tetramers

Autori
Stipanović, Petar ; Vranješ Markić, Leandra

Izvornik
Journal of physics. B, Atomic molecular and optical physics (0953-4075) 51 (2018), 15; 155101, 9

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
halo states ; four-body ; helium-alkali clusters ; structure ; ground-state ; quantum Monte Carlo

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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