PDF Low-Energy Electron Scattering from Molecules, Biomolecules and Surfaces

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Temporary negative ions in molecular gases. The calculations have looked at the presence of ground state dynamical resonances in both biomolecules like Uracil, Thymine, Guanine and in clusters of carbon atoms like C 20 , C 60 and C 8 H 8. The results for biomolecules are the first examples of a nonempirical approach to the calculation of resonant states, resonance widths and resonant wavefunctions for the scattered electron. We succeeded to extend the discrete momentum representation DMR computational method to vibrationally inelastic electron scattering by polyatomic molecules.

Originally the method was restricted to elastic scattering.

Interactions between low energy electrons and DNA

Presently we are close to finish a paper on the vibrationally inelastic electron scattering on propane which will be a joint paper with experimentalists from the University of Colorado. We agreed on another paper with them in which we will study the effect of energy, scattering angle and the direction of the incoming electron on the individual vibrational modes. So far we are using the static-exchange approximation. Preparatory work is underway.

Petr Carsky Roman Curik

Institute of Physics Belgrade Group joining as an associate member to collaborate in research programme. Electron energy loss spectroscopy and electron threshold spectroscopy of H2S and H2O molecules. Measuring the concentration of negative air ions, developing the instrumentation. Experimental device for measurement of excitation and ionization coefficients.

The data may be converted to normalize sets of cross sections especially at higher mean energies.

Introduction

The procedures for swarm analysis of transport data and normalization of cross sections. Data bases for simulation of plasmas: cross section sets including dissociative attachment and ionization cross sections and tested by using the swarm technique. Monte Carlo codes for simulation of electron transport in Time Of Flight and Steady State Townsend conditions, codes for simulation of transport in rf fields, simulations for complex temporal field transients and in complex spatial structures.

Basic semi-analytic transport theory. Momentum Transfer Approximation. Detailed simulation of swarm - surface interactions.


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Experimental device for measurements of the properties of low pressure discharges. Modeling of basic properties of low pressure discharges. Modeling of breakdown in gases, modeling of secondary electron yields in gas breakdown. Capacitively coupled plasma reactors for treatment of polymer surfaces, plasma etching and treatment of organic materials and biological samples. Modleing of plasmas. Modeling of charging in small nanostructures and development of etching in high aspect ratio structures.

Modeling of production of beams of reactive fast neutrals for charging free etching. Studies of adsorption of atomic particles in low pressure discharges by breakdown kinetics. We also have corona and dielectric barrier discharges with possible applications for air cleaning and pseudo spark swicth. We plan to develop additional drift tube for drift velocity and possibly diffusion coefficient measurements and possibly to activate Cavalleri diffusion cell depending on the funds that are available. But these items in the brackets are either not easily associated with the project or depend on the funds to complete the experimental devices.

Report by Professor Loucas G. Christophorou, Academy of Athens, Greece. The first EPIC network group meeting has been a joy to attend. The network has identified and has brought together excellent research groups. The collective membership of the network puts the network at the very top of the field. This field flourished in the USA for almost have a century and is now rejuvenated in Europe with a new outlook and vigor. It was gratifying to see at this meeting the strong emphasis on creating a European infrastructure in the field appropriate for basic and applied science, science education and training, and advanced technology stretching from nanotechnology and plasma science applications to single molecule engineering, controlled beam technology, and advanced instrumentation.

In this regard it was pleasing to see the strong coupling and coordination of the various groups of the network, the extensive collaborations of the various groups, and the efforts being made to bring into this collaboration and field more young scientists. The presentations at the meeting centered mostly on low-energy electron collision induced processes.

An introduction to biomolecules

Foremost among these were the results on negative ion states and reactions both in the gaseous and the condensed phases of matter. These included data on electron scattering, differential electron scattering, attachment, ionization and relative as well as absolute measurements on simple molecules and more complex biomolecules such as Uracil and bases of DNA and RNA.

Most interesting were also the new calculations that have been presented on the effect of the medium on negative ion resonances. It was gratifying to see the theoretical progress achieved in understanding these effects since this is an important step in our efforts to link our knowledge in the gas phase to that in the condensed phases of matter. Similarly, most interesting was the theoretical work on dissociative electron attachment and on the electron energy loss processes, especially those due to vibrational excitation, in collisions of low-energy electrons with small molecules.

The work reported on positron-molecule interactions aimed at the understanding of positron-induced fragmentation of biomolecules and the differences between positron and electron molecule interactions. As the activity of the EPIC network progresses, the group may consider emphasizing the following.

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For Programme of meeting please click here. For Network publications please see either the pages for the group members, or for a complete list click here.

PDF Low-Energy Electron Scattering from Molecules, Biomolecules and Surfaces

He will continue to collaborate on electron collision processes of astronomical importance and is at present studying electron-water collisions in collaboriation with UCL. Consortia to investigate radiation damage in biomolecules including DNA. The consortia involve physicists, chemists and biologists. The programme will run three years from November The OU research will see the restoration of the cold atom lab and the commencement of studies to form ultracold plasmas that is superposition of cold ions and meV electrons.

A three year programme to start in September. A major programme to study how electrons may be used to manipulate atoms and molecules on surfaces and induced chemical processing. It will be the first time that the Scanning Tunnel microscopy community and electron physics community will work together in a common programme. This is to last 5 years starting in early Innsbruck Group. Gernot Hanel has received for his PRL on uracil the student award from the science faculty of the university of Innsbruck. Paul Scheier has received for his work the Lichtenstein price of the University of Innsbruck.

The PRL on electron attachment to uracil G. Hanel, B. Gstir, S. Denifl, P.


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Scheier, M. Probst, B. Farizon, M.

Farizon, E. Illenberger and T. Letters, 90 , has stirred quite some excitement in the scientific and common press, e. The Virtual Journal is an edited compilation of links to articles from participating publishers, covering a focused area of frontier research. Thank you for your contribution. Berlin Group grants. Modification of Molecular films by low energy electrons DFG.

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Funding from the Danish National Science Foundation for running costs over 3 years. Funding from the Danish National Science Foundation for major apparatus requirements. Funding from the Carlsberg Foundation for major apparatus. Two students have completed their Master Thesis in this area of research during the Academic Year UCL Positron Group grants. Armitage, D. Leslie and G.

Electron collisions with LiH. Studies of interactions with biological molecules and in particular the nucleotide based research that is linked to study of radiation damage in DNA. The Network officially started in September and within the first nine months has shown itself to be a dynamic and rapidly evolving Network of the leading scientists in Europe.