Size-dependent dynamics in excited states of gold clusters: from oscillatory motion to photoinduced melting |
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Authors: | Stanzel Jörg Burmeister Florian Neeb Matthias Eberhardt Wolfgang Mitrić Roland Bürgel Christian Bonacić-Koutecký Vlasta |
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Affiliation: | BESSY GmbH, Albert-Einstein-Strasse 15, 12489 Berlin, Germany. |
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Abstract: | Femtosecond time resolved photoelectron spectroscopy in combination with direct ab initio molecular dynamics "on the fly" based on density functional theory has been used to study the relaxation dynamics of optically excited states in small mass selected anionic gold clusters (Au(n) (-); n = 5-8). The nature of the dynamics strongly depends on the cluster size and structure. Oscillatory wavepacket motion (Au(5)(-)), a long lived excited state (Au(6)(-)), as well as photoinduced melting (Au(7)(-),Au(8)(-)) is observed in real time. This illustrates nonscalable properties of excited states in clusters in the size regime, in which each atom counts. |
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