Ca impurity in small mixed $^4$He-$^3$He clusters

Details Ca impurity in small mixed $^4$He-$^3$He clusters Ca impurity in small mixed $^4$He-$^3$He clusters

2009-10-14

arxiv.org/abs/0910.2644v1

J. Chem. Phys. 131, 174110 (2009)

Physics

Atomic and Molecular Clusters

24 pages, 11 figures. Accepted on Journal of Chemical Physics

Scientific paper

10.1063/1.3258273

The structure of small mixed helium clusters doped with one calcium atom has been determined within the diffusion Monte Carlo framework. The results show that the calcium atom sits at the $^4$He-$^3$He interface. This is in agreement with previous studies, both experimental and theoretical, performed for large clusters. A comparison between the results obtained for the largest cluster we have considered for each isotope shows a clear tendency of the Ca atom to reside in a deep dimple at the surface of the cluster for $^4$He clusters, and to become fully solvated for $^3$He clusters. We have calculated the absorption spectrum of Ca around the $4s4p \leftarrow 4s^2$ transition and have found that it is blue-shifted from that of the free-atom transition by an amount that depends on the size and composition of the cluster.

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