Počet záznamů: 1  

Fragmentation of KrN+ clusters after electron impact ionization II. Long-time dynamics simulations of Kr7+ evolution and the role of initial electronic excitation

  1. 1. 0478084 - UGN-S 2018 RIV GB eng J - Článek v odborném periodiku
    Janeček, Ivan - Stachoň, M. - Gadéa, F. X. - Kalus, R.
    Fragmentation of KrN+ clusters after electron impact ionization II. Long-time dynamics simulations of Kr7+ evolution and the role of initial electronic excitation.
    Physical Chemistry Chemical Physics. Roč. 19, č. 37 (2017), s. 25423-25440 ISSN 1463-9076
    Grant CEP: GA MŠk ED2.1.00/03.0082; GA MŠk(CZ) LO1406
    Institucionální podpora: RVO:68145535
    Klíčová slova: atomic clusters * molecular physics * computer simulations
    Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
    Obor OECD: Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)
    Impakt faktor: 4.123, rok: 2016
    http://pubs.rsc.org/en/content/articlelanding/2014/cp/c7cp03940a#!divAbstract

    Long time simulations, up to 100 ns, have been performed for the fragmentation of Kr7+ clusters after electron impact ionization. They rely on DIM approaches and hybrid non-adiabatic dynamics combining mean field and decoherence driven either by Tully fewest switches (TFS) algorithm or through electronic amplitude (AMP) calculations. With both methods, for the first time, when the initial electronic excited state belongs to group II correlating to P1/2 atomic ions, the fragmentation ratio in mainly monomer and dimer ions agrees very well with known experimental results. A complex non-adiabatic dynamics is found where initial neutral monomer evaporations due to gradual deexcitation over electronic states of group II are followed by a non-adiabatic transition across a wide energy gap of the spin–orbit origin to electronic states of group I. The resulting excess of kinetic energy causes the final fragmentation of charged intermediate fragments to stable ionic monomers or dimers. Characteristic times of these processes have been estimated. The kinetic energy distribution of the neutral and ionic monomers (the dominating final fragments) has been analyzed in detail. Interestingly they exhibit some signature of the initial excited electronic state which could allow for an experimental identification.
    Trvalý link: http://hdl.handle.net/11104/0274284