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Exciplexes with Ionic Dopants: Stability, Structure, and Experimental Relevance of M+(2P)4Hen (M = Sr, Ba) (Articolo in rivista)
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- Exciplexes with Ionic Dopants: Stability, Structure, and Experimental Relevance of M+(2P)4Hen (M = Sr, Ba) (Articolo in rivista) (literal)
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- 2014-01-01T00:00:00+01:00 (literal)
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- 10.1021/jp5027306 (literal)
- Alternative label
Massimo Mella, Fausto Cargnoni (2014)
Exciplexes with Ionic Dopants: Stability, Structure, and Experimental Relevance of M+(2P)4Hen (M = Sr, Ba)
in The journal of physical chemistry. A; ACS, American chemical society, Washington, DC (Stati Uniti d'America)
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- Massimo Mella, Fausto Cargnoni (literal)
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- http://pubs.acs.org/doi/abs/10.1021/jp5027306 (literal)
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- Dipartimento di Scienza ed Alta Tecnologia, Universita' dell'Insubria, via Valleggio 11, 22100 Como, Italy
CNR - Istituto di Scienze e Tecnologie Molecolari, Via Golgi 19, 20133 Milano, Italy (literal)
- Titolo
- Exciplexes with Ionic Dopants: Stability, Structure, and Experimental Relevance of M+(2P)4Hen (M = Sr, Ba) (literal)
- Abstract
- M+(2P)4Hen species, possibly involved in the post 2P <- 2S excitation
dynamics of Sr+ and Ba+ in cold 4He gas or droplets, are studied employing both high
level ab initio calculations to determine the potential energy curves (PEC) and diffusion
Monte Carlo (DMC) to obtain information on their ground state structure and
energetics. PEC for the excited M+(2P)He dimers were obtained using MRCI calculations
with extended basis sets. Potential energy surfaces (PES) for M+(2P)Hen were built with
the DIM model including spin-orbit coupling via a perturbative procedure. DMC
simulations indicated several exciplexes (n > 2) to be stable against He dissociation
whatever the ion state, a finding that is at variance with what was previously suggested for
Ba+(2P1/2) due to the repulsive nature of the interaction potential obtained in [Phys. Rev. A 2004, 69, 042505]. Our results,
instead, support the suggestion made in [J. Chem. Phys. 2012, 137, 051102] for the existence of Ba+(2P1/2)Hen exciplexes emitted
following the excitation of the barium cation solvated into He droplets. In the 2P1/2 state, the Ba ion also shows a peculiar
behavior as a function of n with respect to the location and binding strength of the attached He atoms compared to Sr+. Although
the latter forms the usual equatorial He ring, Ba+ deviates from this geometry for 1 <= n <= 4, with the radial distribution functions
strongly depending on the number of solvent atoms. Finally, a putative species is proposed to explain the emission band at 523
nm that follows D1 or D2 excitation of Ba+ in superfluid bulk helium. (literal)
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