Publikation: Relaxation dynamics of magic clusters
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2004
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Physical Review / B. 2004, 70, 35421. Available under: doi: 10.1103/PhysRevB.70.035421
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Using femtosecond time-resolved two-photon photoemission spectroscopy, relaxation rates of the optically excited states in Al13− , Si4− , and Au6− clusters are estimated to be 250 fs , 1.2 ps , and about 1 ns , respectively. These clusters show closed electronic shell structures and large gaps between the highest occupied molecular orbital and the lowest unoccupied molecular orbital in the anionic (Al13−) or neutral ( Si4 and Au6 ) states. Thus the different behaviors of these clusters for the relaxation dynamics cannot be rationalized within a relaxation mechanism dominated by Auger-like electron-electron coupling. We suggest that for these small clusters, the major decay mechanism might be electron-phonon coupling.
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KIM, Young Dok, Marco NIEMIETZ, Peter GERHARDT, Felix von GYNZ-REKOWSKI, Gerd GANTEFÖR, 2004. Relaxation dynamics of magic clusters. In: Physical Review / B. 2004, 70, 35421. Available under: doi: 10.1103/PhysRevB.70.035421BibTex
@article{Kim2004Relax-5246,
year={2004},
doi={10.1103/PhysRevB.70.035421},
title={Relaxation dynamics of magic clusters},
volume={70},
journal={Physical Review / B},
author={Kim, Young Dok and Niemietz, Marco and Gerhardt, Peter and Gynz-Rekowski, Felix von and Ganteför, Gerd},
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<dcterms:abstract xml:lang="eng">Using femtosecond time-resolved two-photon photoemission spectroscopy, relaxation rates of the optically excited states in Al13− , Si4− , and Au6− clusters are estimated to be 250 fs , 1.2 ps , and about 1 ns , respectively. These clusters show closed electronic shell structures and large gaps between the highest occupied molecular orbital and the lowest unoccupied molecular orbital in the anionic (Al13−) or neutral ( Si4 and Au6 ) states. Thus the different behaviors of these clusters for the relaxation dynamics cannot be rationalized within a relaxation mechanism dominated by Auger-like electron-electron coupling. We suggest that for these small clusters, the major decay mechanism might be electron-phonon coupling.</dcterms:abstract>
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