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Quantum features of a barely bound molecular dopant: Cs2( 3Σu) in bosonic helium droplets of variable size

AuthorsPérez de Tudela, Ricardo ; López Durán, David; González-Lezana, Tomás ; Delgado Barrio, Gerardo ; Villarreal, Pablo ; Gianturco, Franco Antonio; Yurtsever, Ersin
Issue Date2011
PublisherAmerican Chemical Society
CitationThe journal of physical chemistry, A, Molecules, spectroscopy, kinetics, environment & general theory 115: 6892- 6902 (2011)
AbstractWe present in this work the study of small 4He N-Cs2(3Σu) aggregates (2 ≥ N ≥ 30) through combined variational, diffusion Monte Carlo (DMC), and path integral Monte Carlo (PIMC) calculations. The full surface is modeled as an addition of He-Cs2 interactions and He-He potentials. Given the negligible strength and large range of the He-Cs2 interaction as compared with the one for He-He, a propensity of the helium atoms to pack themselves together, leaving outside the molecular dopant is to be expected. DMC calculations determine the onset of helium gathering at N = 3. To analyze energetic and structural properties as a function of N, PIMC calculations with no bosonic exchange, i.e., Boltzmann statistics, at low temperatures are carried out. At T = 0.1 K, although acceptable one-particle He-Cs2 distributions are obtained, two-particle He-He distributions are not well described, indicating that the proper symmetry should be taken into account. PIMC distributions at T = 1 K already compare well with DMC ones and show minor exchange effects, although binding energies are still far from having converged in terms of the number of quantum beads. As N increases, the He-He PIMC pair correlation function shows a clear tendency to coincide with the experimental boson-liquid helium one at that temperature. It supports the picture of a helium droplet which carries the molecular impurity on its surface, as found earlier for other triplet dimers. © 2011 American Chemical Society.
Identifiersdoi: 10.1021/jp111825n
issn: 1089-5639
Appears in Collections:(CFMAC-IFF) Artículos
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