2nd Edition of World Nanotechnology Conference

April 27-29, 2020 | Baltimore, USA

Crowne Plaza Hotel Baltimore Dowtown –
Inner Harbor, 105 W Fayette Street
Baltimore, MD 21201 USA
Phone : 1 (702) 988 2320
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Email: worldnano@magnus-group.org
April 27-29, 2020 | Baltimore, USA

George Meskhi

Speaker for Nanotechnology Conferences 2020
George Meskhi
Samtskhe-Javakheti State University, Georgia
Title : Emission of clusters during ion bombardment of solids

Abstract:

A group of atoms bound together by inter-atomic forces is called an atomic cluster. Clusters are formed of matter intermediation between atoms (or molecules) and the solids. The novelty of atomic cluster physics arises mostly from the fact that cluster properties explain the transition from single atoms or molecules to the solid-state. Modern experimental techniques have made it possible to study this transition. Cluster emission phenomena are of scientific and technological interest because of the potential of clusters to form materials with new chemical and physical properties. Consequently, it is important to get high intensity of different cluster flux for their investigations and interactions with matters. The most widely used method of clusters production is the adiabatic expansion of a gas or a vapor through a small nozzle into vacuum. The method of laser evaporation is used very often as well. Clusters from solids can be easily obtained by sputtering surfaces using depositing energy through ions, electrons or photons onto a surface. In the present work emission of clusters during ion bombardment of surfaces are investigated. Now the volume of researches on studying the mechanism of formation of clusters is significant and continues to grow, but for a while an overview of the processes resulting in emission clusters at ion sputtering of surfaces is absent. Especially it is complicated to determinate the mechanism of emission of positive and negative clusters and their excited states, and, despite of the multitude of works that are represented in this direction, till now there is no certain view at process of formation of a charge and exited states of cluster. Investigation of dissociation processes of atomic clusters in different states during production and emission is also very important. With this purpose in the present work during sputtering of various surfaces in a wide range of energy bombardment by various primary ions under different bombarding conditions are presentedinexperimental investigations of cluster ions emission due to the experimental difficulties encountered in the analysis of sputtered neutral particles.
In the present work measurements of the negative and positive cluster ions yields from C, NaCl, Mg, Al, Si, S, Ti, GaAs surfaces under (0,5-50) keV  N+, O+, N2+, O2+, Ar+ bombardmentat different experimental conditions are reported. Cluster ions yields are investigated on dependence on number of atoms in cluster at different conditions of experimental researches. The emission of small (n <10), “light” clusters, which are emitted by a collective motion during the development of the collision cascade after impact. Energy transferred to the surface is strongly directional and can lead to the simultaneous emission of a group of neighboring surface atoms, which in some cases will remain bounded and form a cluster after emission.

Audience take away: 

  • Investigation of cluster ion emission during ion bombardment of solids allows to determine the mechanism of their production. 
  • Investigation of clusters is getting important for their wide application in forming materials with new chemical and physical properties.
  • Especially it is complicated to determinate the mechanism of emission of positive and negative clusters and their excited states, and, despite of the multitude works that are represented in this direction, till now there is no certain view at process of formation a charge and exited states of cluster. With this purpose in the present work during sputtering of various surfaces in a wide range of energy bombardment by various primary ions under different bombarding conditions are presented experimental investigations of cluster ions emission due to the experimental difficulties encountered in the analysis of sputtered neutral particles.
  • Accordingly, it is important to develop the researches in this regard for the future.

Biography:

Prof. Dr. George Meskhi studied Physics at the Tbilisi State University, Georgia, and graduated as Doctor of Sciences in physics mathematics at A F Ioffe Physical-Technical Institute, Russian Academy of Sciences, St Petersburg, Russia in 1983 (title of the dissertation: “Auger and radiation decay of inner shall vacancies during atomic collisions”). He has completed his post-doctoral position at the University of Salford, (Manchester), England, supervised by Prof. Dr. David Armour and Prof. Dr. George Carter. He has published than 70 research articles. Prof. George Meskhi has been elected as a dean of the faculty of Engineering, Agrarian and Natural Science at Samtskhe-Javakheti State University in 2009, where he works as a full professor since 2013.

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