Giant resonances in silver-cluster photofragmentation

Tiggesbäumker, J.; Köller, L.; Lutz, H. O.; Meiwes‐Broer, Karl‐Heinz

doi:10.1016/0009-2614(92)86099-4

Cited by 166 publications

(90 citation statements)

References 38 publications

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“…In general, the present data agree with earlier results on gold and silver cluster ions produced under similar conditions [29,43]. Systematic deviations are observed with respect to the cross sections of silver clusters reported by Tiggesbäumker et al [44] which are larger than the present values. This may be due to the much higher temperature of the clusters well above 1000 K in the earlier investigation as compared to the clusters at room temperature in the present study.…”

Section: Fragment Yields -Photoabsorption Cross Sectionssupporting

confidence: 91%

Photodissociation of small group-11 metal cluster ions: Fragmentation pathways and photoabsorption cross sections

Vogel

Herlert

Schweikhard

2003

J. Am. Soc. Mass Spectrom.

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Noble metal cluster ions Cu n ϩ , Ag n ϩ and Au n ϩ (n ϭ 3-21) have been stored in a Penning trap and photodissociated by low intensity laser pulses of 10 ns at photon energies of 3.49 eV and 4.66 eV. The fragmentation pathways, neutral monomer and dimer evaporation, have been monitored as a function of cluster size, excitation energy and element. It is found that the behavior of the branching ratio between monomer and dimer evaporation as a function of excitation energy depends on the metal under investigation. In particular, the slope of the energy dependence is positive for silver but negative for gold and copper cluster ions. Furthermore, photoabsorption cross sections are determined from observed total fragment yields in single-photon dissociation. (J Am Soc Mass Spectrom 2003, 14, 614 -621)

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Section: Fragment Yields -Photoabsorption Cross Sectionssupporting

confidence: 91%

Photodissociation of small group-11 metal cluster ions: Fragmentation pathways and photoabsorption cross sections

Vogel

Herlert

Schweikhard

2003

J. Am. Soc. Mass Spectrom.

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“…These experiments have allowed an accurate measurement of both the volume plasmon dispersion [1] and the surface plasmon dispersion [2,3]. Recently the surface plasmon mode has been observed in small metal particles by means of fragmentation experiments [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Influence of core electrons on plasmon oscillations

Lipparini

Pederiva

1993

Z Phys D - Atoms, Molecules and Clusters

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Abstract. Core electrons constitute a polarizable background which tends to screen the plasma oscillations. The influence of core electrons on plasmon dispersion is studied with sum rule techniques. Analytical expressions are derived for the surface plasmon of flat surfaces and of small metal particles. Core polarization explains semiquantitatively the blue-shift of the surface plasmon recently observed in silver systems.

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“…Quantum chemistry methods may yield distinct assignments for small N, whereas the effective medium theory explains low-lying excited states in the larger coinage metal clusters. The existence of delocalized electrons in Ag N, N < 20, could recently be revealed by measurements of giant resonances in the optical spectra; such resonances are interpreted to arise from collective excitations of the valence electrons [65]. Thus a quite conclusive picture exists of the (coinage and alkali metal) clusters as being systems with completely new properties due to the electron confinement to a small volume.…”

Section: Photoemission From Deposited Lead Clustersmentioning

confidence: 97%

Electronic properties of free and supported metal clusters studied by photoelectron spectroscopy

Meiwes‐Broer

1992

Appl. Phys. A

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Abstract. The electronic properties of free and supported metal clusters are studied by photoelectron spectroscopy. Experimental as well as theoretical results clearly demonstrate a dramatic dependence of the level structure on the cluster size. By this an interesting way might be opened to modify the electronic, optical and chemical properties of surfaces. 36.40.+d; 79.60.-i; 82.65.-i Optical and electronic properties of materials may change upon reduction of their sizes. This phenomenon is wellknown in the study of, e.g., thin films where the electrical conductivity is influenced by the confinement of the charge carriers to two dimensions. A three-dimensional confinement to a few A in diameter will induce discrete energy levels. Figure 1 schematically sketches the change in the density of states upon a reduction of the dimensionality. For the very small sizes, experimental and theoretical evidence suggests a picture of the valence electrons (e.g., in an alkali cluster) as a system of Fermi particles, being quantized in a mean field made up by the positive atomic cores. The order and spacing of the levels depends on the geometry of the confining volume as well as the details of the effective potential seen by the electrons. Such "quantum size effects" are well-known from, e.g., nuclear physics. They also play an important role in the transition regime between atom and solid-state physics [1,2]. PACS:Semiconductor quantum devices (e.g., ballistic transistors) are already used to tune electronic properties. The potential scope of these new devices gives rise to hope that simple binary switches might be replaced by complex multiswitches. As building blocks in integrated circuits they could lead to a dramatic increase of the frequency of logic steps as well as to a further decrease of the system size [3]. Metal quantum devices, on the other hand, would need even further reduced distances (~ 10 A compared to about 150 A for the case of semiconductors).Gas-phase metal clusters are well suited to model such confined systems: Early evidence has come, in particular,

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Giant resonances in silver-cluster photofragmentation

Cited by 166 publications

References 38 publications

Photodissociation of small group-11 metal cluster ions: Fragmentation pathways and photoabsorption cross sections

Photodissociation of small group-11 metal cluster ions: Fragmentation pathways and photoabsorption cross sections

Influence of core electrons on plasmon oscillations

Electronic properties of free and supported metal clusters studied by photoelectron spectroscopy

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