Collective dipole oscillations in small silver clusters embedded in rare-gas matrices

Fedrigo, S.; Harbich, W.; Buttet, J.

doi:10.1103/physrevb.47.10706

Cited by 313 publications

(307 citation statements)

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“…We can exclude energy transfer between different clusters due the high dilution ratio of the clusters in the matrix. Indeed, although the absorption spectrum previously measured [14] shows broad features due to the contribution of different isomers, the excitation spectrum that we measure has a welldefined four peaks structure.…”

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“…They exhibit very distinct spectral features and allow for the interpretation of the measured absorption spectra. In particular, the absorption spectrum of isomer I shows one dominant transition at 3.92 eV corresponding to the measured dominant band in the excitation spectrum shifted by 0.25 eV to account for the influence of the argon matrix [14]. Lower intensity transitions are distributed in the blue and red region with respect to the dominant transition.…”

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confidence: 99%

“…There are, however, exceptions, especially at low temperature [11]. For size-selected clusters deposited in a rare-gas matrix, it has been shown that conditions can be found to minimize fragmentation [14]. However, it is not clear that the embedded clusters all correspond to the minimum-energy configuration: the different isomers present in the beam and the deposition process itself could lead to the trapping of different isomers.…”

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“…Given the low temperature at which the measurements are made, we attribute these modes to the vibrational structure of the ground state [21]. Figure 2 presents the absorption spectrum [14], the fluorescence spectrum (measured at 25 K), and the corresponding excitation spectrum of Ag 9 in an argon matrix.…”

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Isomer-specific spectroscopy of metal clusters trapped in a matrix:Ag9

et al. 2004

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Clusters of metal atoms at a fixed size can assume different structural arrangements, known as isomers, which may have nearly the same energy. Therefore, at given experimental conditions distribution of these isomers can be present. While the size selection is a relatively common technique, the isomer selection is not; it is therefore more difficult to obtain information about a single isomer. We report here on isomer-specific spectroscopy of Ag 9 clusters together with ab initio calculations allowing to identify the isomer responsible for the measured excitation pattern and fluorescence. Recent experiments by fluorescence microscopy of nanoscale silver oxide [1] have demonstrated that strong photoactivated emission can be generated by uv excitation. The individual luminescent species are thought to be silver nanoclusters that are photochemically generated from the oxide. The color of individual emissive sites changes as a function of time, and the authors relate it to the changing charge and size of the Ag clusters. This work, together with further investigations, indicates that silver nanoclusters and, more generally, metal clusters could be useful in optoelectronics as storage devices [1], full quantum logic elements [2], or possibly as lasing media. It is thus important to understand better the emissive properties of supported metal clusters.In the gas phase, small metal clusters have been investigated using optical spectroscopy techniques such as resonant two-photon ionization (R2PI), laser-induced fluorescence [3,4], and pump-probe techniques. However, as the size increases, fragmentation becomes a dominant process and nondissociative electronic excitation processes have not been observed for gas-phase metal clusters larger than the trimer, unless very short pulses are used [5]. The optical absorption spectra of larger metal clusters have thus been obtained using photodepletion spectroscopy [6].The situation is different in a matrix due to the cage effect, which effectively prevents dissociation. This opens the possibility to observe the fluorescence of particles larger than the trimer, if the excited state of the particle has a sufficient lifetime for radiative transition to take place. It was, in particular, recently shown that neutral Ag 4 [7] and Ag 8 [8] clusters embedded in an argon matrix have a strong fluorescence signal.However, a major difficulty, both in the gas phase and supported cluster experiments, is that in general molecular beams are not formed from a single isomer. This is particularly true for metal clusters, in which the delocalized nature of the valence electrons leads, for a given size, to isomers which may be quasidegenerate with the lowest energy structure [9,10]. This can lead to ambiguities in the assignment of measured features to a given isomer and to enlargement of the peaks. There are, however, exceptions, especially at low temperature [11]. For size-selected clusters deposited in a rare-gas matrix, it has been shown that conditions can be found to minimize fragmentation [14]...

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Isomer-specific spectroscopy of metal clusters trapped in a matrix:Ag9

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“…1 Over the past few years renewed effort on the preparation and understanding of the properties of clusters deposited in a matrix 2 or on a surface 3 has been undertaken, in the hope of forming nanostructures with a well-defined shape and number of atoms. Deposition at low energy of size-selected clusters on a solid substrate is well suited to achieve this goal.…”

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Morphology and evolution of size-selected metallic clusters deposited on a metal surface:Ag19+/Pd(100)
Félix
¹
,
Vandoni
²
,
Massobrio
³

et al. 1998
Phys. Rev. B
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We study size-selected deposition of Ag 19 ϩ clusters on Pd͑100͒ at total kinetic energies of 20 and 95 eV using thermal energy atom scattering and molecular-dynamics simulations. Contrary to the case of Ag 7 where fragmentation is crucial to explain the data, the deposition leads at low temperature to noncompact structures localized around the impact point. We propose a model in which morphology changes take place between 200 and 300 K resulting in well-separated compact structures. ͓S0163-1829͑98͒06907-0͔

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Light Emission in Matrix Assisted Cluster-Cluster Reactions

Rabin

Schulze

Ertl

1998

Cryst. Res. Technol.

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Collective dipole oscillations in small silver clusters embedded in rare-gas matrices

Cited by 313 publications

References 43 publications

Isomer-specific spectroscopy of metal clusters trapped in a matrix:Ag9

Isomer-specific spectroscopy of metal clusters trapped in a matrix:Ag9

Morphology and evolution of size-selected metallic clusters deposited on a metal surface:Ag19+/Pd(100)
Félix
¹
,
Vandoni
²
,
Massobrio
³

et al. 1998
Phys. Rev. B
Self Cite
11
1
9
0
View full text Add to dashboard Cite

Light Emission in Matrix Assisted Cluster-Cluster Reactions

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Collective dipole oscillations in small silver clusters embedded in rare-gas matrices

Cited by 313 publications

References 43 publications

Isomer-specific spectroscopy of metal clusters trapped in a matrix:Ag9

Isomer-specific spectroscopy of metal clusters trapped in a matrix:Ag9

Morphology and evolution of size-selected metallic clusters deposited on a metal surface:Ag19+/Pd(100)Félix1, Vandoni2, Massobrio3 et al. 1998Phys. Rev. BSelf Cite11190View full textAdd to dashboardCite

Light Emission in Matrix Assisted Cluster-Cluster Reactions

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Morphology and evolution of size-selected metallic clusters deposited on a metal surface:Ag19+/Pd(100)
Félix
¹
,
Vandoni
²
,
Massobrio
³

et al. 1998
Phys. Rev. B
Self Cite
11
1
9
0
View full text Add to dashboard Cite