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Briant M, Mestdagh JM, Gaveau MA, Poisson L. Reaction dynamics within a cluster environment. Phys Chem Chem Phys 2022; 24:9807-9835. [PMID: 35441619 DOI: 10.1039/d1cp05783a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This perspective article reviews experimental and theoretical works where rare gas clusters and helium nanodroplets are used as a nanoreactor to investigate chemical dynamics in a solvent environment. A historical perspective is presented first followed by specific considerations on the mobility of reactants within these reaction media. The dynamical response of pure clusters and nanodroplets to photoexcitation is shortly reviewed before examining the role of the cluster (or nanodroplet) degrees of freedom in the photodynamics of the guest atoms and molecules.
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Affiliation(s)
- Marc Briant
- Université Paris-Saclay, CEA, CNRS, LIDYL, 91191, Gif-sur-Yvette, France
| | | | - Marc-André Gaveau
- Université Paris-Saclay, CEA, CNRS, LIDYL, 91191, Gif-sur-Yvette, France
| | - Lionel Poisson
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay, 91405, Orsay, France.
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Gervais B, Zanuttini D, Douady J. Spin-orbit coupling in the dissociative excitation of alkali atoms at the surface of rare gas clusters: A theoretical study. J Chem Phys 2016; 144:194307. [PMID: 27208949 DOI: 10.1063/1.4948814] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
We analyze the role of the spin-orbit (SO) coupling in the dissociative dynamics of excited alkali atoms at the surface of small rare gas clusters. The electronic structure of the whole system is deduced from a one-electron model based on core polarization pseudo-potentials. It allows us to obtain in the same footing the energy, forces, and non-adiabatic couplings used to simulate the dynamics by means of a surface hopping method. The fine structure state population is analyzed by considering the relative magnitude of the SO coupling ξ, with respect to the spin-free potential energy. We identify three regimes of ξ-values leading to different evolution of adiabatic state population after excitation of the system in the uppermost state of the lowest np (2)P shell. For sufficiently small ξ, the final population of the J=12 atomic states, P12, grows up linearly from P12=13 at ξ = 0 after a diabatic dynamics. For large values of ξ, we observe a rather adiabatic dynamics with P12 decreasing as ξ increases. For intermediate values of ξ, the coupling is extremely efficient and a complete transfer of population is observed for the set of parameters associated to NaAr3 and NaAr4 clusters.
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Affiliation(s)
- B Gervais
- CIMAP, Unité Mixte CEA-CNRS-ENSICAEN-UCBN 6252 BP 5133, F-14070 Caen Cedex 05, France
| | - D Zanuttini
- CIMAP, Unité Mixte CEA-CNRS-ENSICAEN-UCBN 6252 BP 5133, F-14070 Caen Cedex 05, France
| | - J Douady
- CIMAP, Unité Mixte CEA-CNRS-ENSICAEN-UCBN 6252 BP 5133, F-14070 Caen Cedex 05, France
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Awali S, Gaveau MA, Briant M, Mestdagh JM, Soep B, Gobert O, Maksimenka R, Poisson L. Multipronged mapping to the dynamics of a barium atom deposited on argon clusters. Phys Chem Chem Phys 2016; 18:32378-32386. [DOI: 10.1039/c6cp04878a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Dynamics of an electronically excited Ba atom at the surface of an Ar≈500 cluster in a nanosecond frequency-resolved and femtosecond time-resolved multipronged approach.
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Affiliation(s)
- S. Awali
- LIDYL
- CEA
- CNRS
- Université Paris-Saclay
- F-91191 Gif-sur-Yvette
| | - M.-A. Gaveau
- LIDYL
- CEA
- CNRS
- Université Paris-Saclay
- F-91191 Gif-sur-Yvette
| | - M. Briant
- LIDYL
- CEA
- CNRS
- Université Paris-Saclay
- F-91191 Gif-sur-Yvette
| | - J.-M. Mestdagh
- LIDYL
- CEA
- CNRS
- Université Paris-Saclay
- F-91191 Gif-sur-Yvette
| | - B. Soep
- LIDYL
- CEA
- CNRS
- Université Paris-Saclay
- F-91191 Gif-sur-Yvette
| | - O. Gobert
- LIDYL
- CEA
- CNRS
- Université Paris-Saclay
- F-91191 Gif-sur-Yvette
| | - R. Maksimenka
- LIDYL
- CEA
- CNRS
- Université Paris-Saclay
- F-91191 Gif-sur-Yvette
| | - L. Poisson
- LIDYL
- CEA
- CNRS
- Université Paris-Saclay
- F-91191 Gif-sur-Yvette
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Awali S, Poisson L, Rhouma MBEH, Mestdagh JM. Absorption Spectroscopy, a Tool for Probing Local Structures and the Onset of Large-Amplitude Motions in Small KAr(n) Clusters at Increasing Temperatures. J Phys Chem A 2015; 119:9729-38. [PMID: 26301681 DOI: 10.1021/acs.jpca.5b07192] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Photoabsorption spectra of KArn (n = 1-10) are simulated at temperatures ranging between 5 and 25 K. The calculations associate a Monte Carlo (MC) method to sample cluster geometries at temperature T, with a one-electron ab initio model to calculate the ground-state and excited-state energies of the cluster. The latter model replaces the K(+) core electrons and all the electrons of the Ar atoms by appropriate pseudopotentials, complemented by core polarization potentials. It also provides the necessary oscillator strengths to simulate the spectra. Global optimization by basin-hopping is used in combination with MC simulation at low temperature (5 K) to identify the most stable isomer and remarkable isomers of ground-state KArn clusters, which are stable with respect to deformations of the order of those expected with Zero Point Energy motions. The absorption spectra calculated for each of these isomers at 5 K suggest that absorption spectroscopy can probe sensitively the local environment of K atom: surface location of K with respect to a close-packed Ar moiety, number of Ar atom in close vicinity, and local symmetry about K. Simulation at increasing temperatures, up to the evaporation limit of K out of the cluster, shows the onset of large amplitude motions above 20 K, when the K atom experiences a variety of local environments.
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Affiliation(s)
- Slim Awali
- Laboratoire Francis Perrin, URA 2453, CEA/IRAMIS/LIDyL , F-91191 Gif-sur-Yvette Cedex, France.,Laboratoire Francis Perrin, URA 2453, CNRS/IRAMIS/LIDyL , F-91191 Gif-sur-Yvette Cedex, France.,Laboratoire d'Etudes des Milieux Ionisés et Réactifs (EMIR), Institut Préparatoire aux Etudes d'Ingénieurs , Monastir, Tunisia
| | - Lionel Poisson
- Laboratoire Francis Perrin, URA 2453, CEA/IRAMIS/LIDyL , F-91191 Gif-sur-Yvette Cedex, France.,Laboratoire Francis Perrin, URA 2453, CNRS/IRAMIS/LIDyL , F-91191 Gif-sur-Yvette Cedex, France
| | - Mounir Ben El Hadj Rhouma
- Laboratoire d'Etudes des Milieux Ionisés et Réactifs (EMIR), Institut Préparatoire aux Etudes d'Ingénieurs , Monastir, Tunisia
| | - Jean-Michel Mestdagh
- Laboratoire Francis Perrin, URA 2453, CEA/IRAMIS/LIDyL , F-91191 Gif-sur-Yvette Cedex, France.,Laboratoire Francis Perrin, URA 2453, CNRS/IRAMIS/LIDyL , F-91191 Gif-sur-Yvette Cedex, France
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