Interplay between collective and single electron excitations in large metal clusters

1993 ◽  
Vol 26 (1-4) ◽  
pp. 267-269 ◽  
Author(s):  
T. G�tz ◽  
W. Hoheisel ◽  
F. Tr�ger ◽  
M. Vollmer
Keyword(s):  
Metal Clusters ◽  
Single Electron ◽  
Electron Excitations

Study of single-electron excitations by electron microscopy I. Image contrast from delocalized excitations

1978 ◽  
Vol 38 (5) ◽  
pp. 519-527 ◽  
Author(s):  
A. J. Craven ◽  
J. M. Gibson ◽  
A. Howie ◽  
D. R. Spalding
Keyword(s):  
Electron Microscopy ◽  
Image Contrast ◽  
Single Electron ◽  
Electron Excitations

scholarly journals Single-electron excitations and interactions in integer quantum Hall systems at ν = 2

2019 ◽  
Vol 1182 ◽  
pp. 012003
Author(s):  
Matteo Acciai ◽  
Matteo Carrega ◽  
Jérôme Rech ◽  
Thibaut Jonckheere ◽  
Dario Ferraro ◽  
...  
Keyword(s):  
Quantum Hall ◽  
Single Electron ◽  
Quantum Hall Systems ◽  
Integer Quantum ◽  
Electron Excitations

DYNAMIC JELLIUM MODEL FOR METALLIC CLUSTERS

1999 ◽  
Vol 08 (03) ◽  
pp. 289-298 ◽  
Author(s):  
LEONID G. GERCHIKOV ◽  
ANDREY V. SOLOV'YOV ◽  
WALTER GREINER
Keyword(s):  
Relaxation Time ◽  
Decay Time ◽  
Adiabatic Approximation ◽  
Metal Clusters ◽  
Electron Motion ◽  
Vibrational Modes ◽  
Jellium Model ◽  
Metallic Clusters ◽  
Energy Relaxation Time ◽  
Electron Excitations

We have developed a dynamic jellium model for metallic clusters, which treats simultaneously the vibrational modes of the ionic jellium background in a cluster, the quantized electron motion and the interaction between the electronic and the ionic subsystems beyond the adiabatic approximation. Using this model, we have calculated the widths of electron excitations in metal clusters in the vicinity of the plasmon resonance caused by the multiphonon transitions and investigated their temperature dependence. We estimated the decay time and the energy relaxation time of electron excitations in metal clusters.

Production and STEM examination of controlled-size silver clusters

1983 ◽  
Vol 41 ◽  
pp. 338-339
Author(s):  
M. A. Listvan ◽  
R. P. Andres
Keyword(s):  
Cluster Size ◽  
Metal Clusters ◽  
Experimental Parameter ◽  
Carbon Films ◽  
Metal Species ◽  
Silver Clusters ◽  
Free Jet ◽  
Size Dependent ◽  
Cluster Properties ◽  
Controllable Size

Knowledge of the function and structure of small metal clusters is one goal of research in catalysis. One important experimental parameter is cluster size. Ideally, one would like to produce metal clusters of regulated size in order to characterize size-dependent cluster properties.A source has been developed which is capable of producing microscopic metal clusters of controllable size (in the range 5-500 atoms) This source, the Multiple Expansion Cluster Source, with a Free Jet Deceleration Filter (MECS/FJDF) operates as follows. The bulk metal is heated in an oven to give controlled concentrations of monomer and dimer which were expanded sonically. These metal species were quenched and condensed in He and filtered to produce areosol particles of a controlled size as verified by mass spectrometer measurements. The clusters were caught on pre-mounted, clean carbon films. The grids were then transferred in air for microscopic examination. MECS/FJDF was used to produce two different sizes of silver clusters for this study: nominally Ag6 and Ag50.

Evaluation of single-electron movies of glutamine synthetase molecules

1983 ◽  
Vol 41 ◽  
pp. 280-281
Author(s):  
W. Kunath ◽  
E. Zeitler ◽  
M. Kessel
Keyword(s):  
Electron Microscope ◽  
Glutamine Synthetase ◽  
Electron Irradiation ◽  
Structural Damage ◽  
Structural Changes ◽  
Single Electron ◽  
Continuous Series ◽  
Digital Recording ◽  
Recording Device ◽  
Low Exposure

The features of digital recording of a continuous series (movie) of singleelectron TV frames are reported. The technique is used to investigate structural changes in negatively stained glutamine synthetase molecules (GS) during electron irradiation and, as an ultimate goal, to look for the molecules' “undamaged” structure, say, after a 1 e/Å2 dose.The TV frame of fig. la shows an image of 5 glutamine synthetase molecules exposed to 1/150 e/Å2. Every single electron is recorded as a unit signal in a 256 ×256 field. The extremely low exposure of a single TV frame as dictated by the single-electron recording device including the electron microscope requires accumulation of 150 TV frames into one frame (fig. lb) thus achieving a reasonable compromise between the conflicting aspects of exposure time per frame of 3 sec. vs. object drift of less than 1 Å, and exposure per frame of 1 e/Å2 vs. rate of structural damage.

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