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Slow Interatomic Coulombic Decay of Multiply Excited Neon Clusters

Ne clusters (5000atoms) were resonantly excited (2p3s) by intense free electron laser (FEL) radiation at FERMI. Such multiply excited clusters can decay nonradiatively via energy exchange between at least two neighboring excited atoms. Benefiting from the precise tunability and narrow bandwidth of seeded FEL radiation, specific sites of the Ne clusters were probed. D. Iablonskyi et al. Physical Review Letters, Vol. 117 - 27, pp. 276806 (2016)
We have studied the relaxation processes in Ne clusters following multiple valence excitations by intense FEL pulses. Benefiting from the precise tunability and narrow photon bandwidth of the FERMI FEL, specific sites of the cluster were probed selectively. The interatomic Coulombic decay processes of such multiply excited clusters have been identified unambiguously. The 2p3s excitation of cluster surface atoms is followed by a clear sequence of ICD processes involving pairs of excited atoms. The ICD following 2p3s excitation of cluster interior atoms is additionally affected by the intracluster inelastic scattering of emitted ICD electrons from excited atoms, promoting them to the higher Rydberg states or to the continuum. For both surface and bulk excitations, the cluster atoms relax to atomic states prior to ICD, indicating its long lifetime ( ps) in comparison to ICD following photoionization, which is usually very fast (of the order of 10 fs). The lifetime of the ICD state is very sensitive to the environment, in particular, to the distance between the neighbors. The long lifetime of the presently observed ICD stems from the distances between the two adjacent excited states. Generally it is rather difficult to control the distance between the atoms in the cluster: in this case the Coulomb blockade sets a convenient limit; this observation furthermore suggests that we can control the ICD rate by the laser intensity since it controls the number of excited states in the cluster. The controllable relaxation mechanism of multiply excited Ne clusters reported in this Letter is expected to be a very general phenomenon occurring in any weakly bound systems exposed to intense resonant light. Retrieve article
Slow Interatomic Coulombic Decay of Multiply Excited Neon Clusters
Iablonskyi Denys, Nagaya Kiyonobu, Fukuzawa Hironobu, Motomura Koji, Kumagai Yoshiaki, Mondal Subhendu, Tachibana Tetsuya, Takanashi Tsukasa, Nishiyama Toshiyuki, Matsunami K., Johnsson Per, Piseri Paolo, Sansone Giuseppe, Dubrouil Antoine, Reduzzi Maurizio, Carpeggiani Paolo Antonio, Vozzi Caterina, Devetta Michele, Negro Matteo, Calegari Francesca, Trabattoni Andrea, Castrovilli Mattea Carmen, Faccialà Davide, Ovcharenko Yevheniy, Moeller Thomas, Mudrich Marcel, Stienkemeier Frank, Coreno Marcello, Alagia Michele, Schuette Bernd, Berrah Nora, Kuleff Alexander, Jabbari G., Callegari Carlo, Plekan Oksana, Finetti Paola, Spezzani Carlo, Ferrari Eugenio, Allaria Enrico Massimiliano, Penco Giuseppe Maria, Serpico Claudio, De Ninno Giovanni, Nikolov Ivaylo Petrov, Diviacco Bruno, Di Mitri Simone, Giannessi Luca, Prince Kevin Charles, Ueda Kiyoshi
Physical Review Letters, Vol. 117 - 27, pp. 276806 (2016)
doi: 10.1103/PhysRevLett.117.276806
Last Updated on Thursday, 13 April 2017 12:59