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Issue 25, 2013
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Solvent states and spectroscopy of doped helium clusters as a quantum-chemistry-like problem

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Abstract

The Full-Configuration-Interaction Nuclear-Orbital (FCI-NO) approach [J. Chem. Phys., 2009, 131, 19401], as the implementation of the quantum-chemistry ansatz, is overviewed and applied to (He)N–Cl2(X) clusters (N ≤ 4). The ground and excited states of both fermionic 3He and bosonic 4He [see also, J. Phys. Chem. Lett., 2012, 2, 2145] clusters are studied. It is shown that the FCI-NO approach allows us to overcome three main difficulties: (1) the Fermi–Dirac (Bose–Einstein) nuclear statistics; (2) the wide (highly anharmonic) amplitudes of the He–dopant and He–He motions; and (3) both the weakly attractive (long-range) and the strongly repulsive (short-range) interaction between the helium atoms. Special emphasis is placed on the dependence of the cluster properties on the number of helium atoms, and on the comparison between the two helium isotopes. In particular, we analyze the analogies between quantum rings comprising electrons and 3He atoms. The synthetic vibro-rotational Raman spectra of Cl2(X) immersed in (3,4He)N clusters (N ≤ 4) are discussed as a function of the cluster size and the nuclear statistics. It is shown that the Coriolis couplings play a key role in modifying the spectral dopant profile in 3He. Finally, we point out possible directions for future research using the quantum-chemistry ansatz.

Graphical abstract: Solvent states and spectroscopy of doped helium clusters as a quantum-chemistry-like problem

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Article information


Submitted
21 Jan 2013
Accepted
07 Mar 2013
First published
25 Mar 2013

Phys. Chem. Chem. Phys., 2013,15, 10126-10140
Article type
Paper

Solvent states and spectroscopy of doped helium clusters as a quantum-chemistry-like problem

N. F. Aguirre, P. Villarreal, G. Delgado-Barrio, A. O. Mitrushchenkov and M. P. de Lara-Castells, Phys. Chem. Chem. Phys., 2013, 15, 10126
DOI: 10.1039/C3CP50282A

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