Ionization threshold energies for metal clusters

1986 ◽  
Author(s):  
D. M. Cox ◽  
R. L. Whetten ◽  
M. R. Zakin ◽  
D. J. Trevor ◽  
K. C. Reichmann ◽  
...  
Keyword(s):  
Metal Clusters ◽  
Ionization Threshold ◽  
Threshold Energies

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.

Anisotropy of damage productions in electron irradiated molybdenum

1978 ◽  
Vol 36 (1) ◽  
pp. 354-355
Author(s):  
K. Izui ◽  
S. Furuno ◽  
H. Otsu ◽  
T. Nishida ◽  
H. Maeta
Keyword(s):  
Electron Flux ◽  
Threshold Energy ◽  
High Energy ◽  
Voltage Electron ◽  
High Voltage Electron Microscope ◽  
Displacement Threshold ◽  
The Mean ◽  
Channeling Effect ◽  
Different Origins ◽  
Threshold Energies

Anisotropy of damage productions in crystals due to high energy electron bombardment are caused from two different origins. One is an anisotropic displacement threshold energy, and the other is an anisotropic distribution of electron flux near the atomic rows in crystals due to the electron channeling effect. By the n-beam dynamical calculations for germanium and molybdenum we have shown that electron flux at the atomic positions are from ∽4 to ∽7 times larger than the mean incident flux for the principal zone axis directions of incident 1 MeV electron beams, and concluded that such a locally increased electron flux results in an enhanced damage production. The present paper reports the experimental evidence for the enhanced damage production due to the locally increased electron flux and also the results of measurements of the displacement threshold energies for the <100>,<110> and <111> directions in molybdenum crystals by using a high voltage electron microscope.

Short Communication: Synthesis of Polymer-Embedded Metal Clusters by Thermolysis of Mercaptides—Polymer Blends

Polymer News ◽  
2005 ◽  
Vol 30 (9) ◽  
pp. 296-300
Author(s):  
F. Esposito ◽  
V. Casuscelli ◽  
M. V. Volpe ◽  
G. Carotenuto ◽  
L. Nicolais
Keyword(s):  
Polymer Blends ◽  
Short Communication ◽  
Metal Clusters ◽  
Communication Synthesis

Structural reconstruction of germanosilicate frameworks by controlled hydrogen reduction

2019 ◽  
Vol 55 (13) ◽  
pp. 1883-1886 ◽  
Author(s):  
Yue Ma ◽  
Hao Xu ◽  
Xue Liu ◽  
Mingming Peng ◽  
Wenting Mao ◽  
...  
Keyword(s):  
Metal Clusters ◽  
Hydrogen Reduction ◽  
Hydrogen Atmosphere ◽  
Water Washing

Calcined UTL-type germanosilicate was firstly reduced in a hydrogen atmosphere at an appropriate temperature. Then, air-calcination and water-washing procedures were performed to remove the Ge metal clusters or crystals originated from the reduction of skeleton germanium(iv) to yield pure zeolite phase of two daughter structures analogous to IPC-2 and IPC-6.

Insights into oxygen activation on metal clusters for catalyst design

2021 ◽  
Author(s):  
LiXin Chen ◽  
Zi Wen ◽  
Zhi Wen Chen ◽  
Qing Jiang ◽  
Chandra Veer Singh
Keyword(s):  
Metal Clusters ◽  
Aerobic Oxidation ◽  
Oxygen Activation ◽  
Vital Role ◽  
Catalyst Design ◽  
Activation Mechanism ◽  
Oxidation Reactions

The activation mechanism of O2 molecules plays a vital role in the development of catalysts for aerobic oxidation reactions. To gain insights into the activation mechanism of O2, the square...

scholarly journals Infrared action spectroscopy of nitrous oxide on cationic gold and cobalt clusters

2021 ◽  
Vol 23 (1) ◽  
pp. 329-338
Author(s):  
Ethan M. Cunningham ◽  
Alice E. Green ◽  
Gabriele Meizyte ◽  
Alexander S. Gentleman ◽  
Peter W. Beardsmore ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Metal Clusters ◽  
Cobalt Clusters ◽  
Action Spectroscopy ◽  
Infrared Multiple Photon Dissociation ◽  
Cationic Gold

Infrared multiple-photon dissociation spectroscopy reveals the nature of nitrous oxide binding to metal clusters.

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