Project

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Electron-driven chemistry at liquid interfaces

Applicant Fedor Juraj
Number 132357
Funding scheme Ambizione
Research institution Département de Chimie Université de Fribourg
Institution of higher education University of Fribourg - FR
Main discipline Physical Chemistry
Start/End 01.07.2011 - 31.07.2014
Approved amount 479'111.00
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Keywords (4)

liquid micro-jet; electron spectroscopy; resonances; radiation damage

Lay Summary (English)

Lead
Lay summary
Electron impact experiments provide insight into structure of the molecular targets and properties of the temporary negative ion species. So far, all existing experiments have worked with target molecules in gas or solid phase. The scope of the present project is to do electron spectroscopy on liquid targets.

Context and impact: Processes induced by free electrons play an important role in several scientific fields, e.g., radiation damage to biological tissue or atmospheric chemistry. Plethora of these processes in nature occurs in liquid environment. However, elementary electron-impact phenomena were generally experimentally studied only for the gas and solid phase targets. Due to a simple reason - experiments with free electrons require high vacuum environment. It is difficult to bring the surface of clean volatile liquid into such vacuum. Recently, this difficulty has been partially overcome by the invention of a liquid micro-jet technique at MPI Göttingen, Germany. To our knowledge, the present experiment will be the first to investigate electron scattering on liquid micro-jets. The experiment will provide the data about electron-induced molecular damage occurring in liquid phase. A research field that should benefit the most from this data is that of radiation damage to biological systems. It is a well known fact, that the majority of biological damage is caused not by the high-energy radiation itself but rather by secondary slow electrons which are created by this radiation. The present experiment may, for example, identify the intermediate - 'doorway' - states of such secondary electrons as they are slowed down in liquid.

Methodology: The project consists from two parallel parts. In major part, the electron-driven processes at liquid interface will be investigated by the combination of the liquid micro-jet technique and the electron scattering infrastructure available in Fribourg. This implies construction of the liquid micro-jet source, its implementation on the electrostatic spectrometer and measurements of electron energy loss spectra for a range of liquids. Simultaneously to that, the principles governing electron-driven processes in single molecules will be characterized, by means of measuring the quantitative data - i.e., the electron scattering cross sections for various scattering channels.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Irregular Shapes of Water Clusters Generated in Supersonic Expansions
Lengyel Jozef, Pysanenko Andryi, Poterya Viktoria, Slavicek Petr, Farnik Michal, Kocisek Jaroslav, Fedor Juraj (2014), Irregular Shapes of Water Clusters Generated in Supersonic Expansions, in Physical Review Letters, 112, 113401.
Partial cross sections for dissociative electron attachment to tetrahydrofuran reveal a dynamics-driven rich fragmentation pattern
Janeckova Radmila, May Olivier, Milosavljevic Aleksandar, Fedor Juraj (2014), Partial cross sections for dissociative electron attachment to tetrahydrofuran reveal a dynamics-driven rich fragmentation pattern, in International Journal of Mass Spectrometry, 365-366, 163.
Electron impact excitation of methane: determination of appearance energies for dissociation products
Danko M., Orszagh J., Durian M., Kocisek J., Daxner M., Zottl S., Maljkovic J. B., Fedor J., Scheier P., Denifl S., Matejcik S. (2013), Electron impact excitation of methane: determination of appearance energies for dissociation products, in Journal of Physics B, 46(4), 045203.
Experimental Evidence on the Mechanism of Dissociative Electron Attachment to Formic Acid
Janeckova Radmila, Kubala Dusan, May Olivier, Fedor Juraj, Allan Michael (2013), Experimental Evidence on the Mechanism of Dissociative Electron Attachment to Formic Acid, in Physical Review Letters, 111, 213201.
The electronic structure of TEMPO, its cation and anion
Kubala D., Regeta K., Janeckova R., Fedor J., Grimme S., Hansen A., Nesvadba P., Allan M. (2013), The electronic structure of TEMPO, its cation and anion, in Molecular Physics, 1.
Dissociative electron attachment to methylacetylene and dimethylacetylene: Symmetry versus Proximity
Janeckova Radmila, May Olivier, Fedor Juraj (2012), Dissociative electron attachment to methylacetylene and dimethylacetylene: Symmetry versus Proximity, in Physical Review A, 82(5), 052702.
Oxidation of sterols: Energetics of C-H and O-H bond cleavage
Lengyel J., Rimarčík J., Vagánek A., Fedor J., Lukeš V., Klein E. (2012), Oxidation of sterols: Energetics of C-H and O-H bond cleavage, in Food Chemistry, 133, 1435-1435.
Uptake of atmospheric molecules by ice nanoparticles: Pickup cross sections
Lengyel J., Kočišek J., Poterya V., Pysanenko A., Svrčková P., Fárník M., Zaouris D.K., Fedor J. (2012), Uptake of atmospheric molecules by ice nanoparticles: Pickup cross sections, in Journal of Chemical Physics, 137, 043301-043301.
Short review of acetylene photochemistry in clusters: Photofragment caging and reactivity
Fárník M., Poterya V., Kočišek J., Fedor J., Slavíček P., Short review of acetylene photochemistry in clusters: Photofragment caging and reactivity, in Molecular Physics.

Collaboration

Group / person Country
Types of collaboration
Department of Experimental Physics, Bratislava Slovakia (Europe)
- Publication
Institute of Physics Belgrade Serbien (Europe)
- Publication
- Exchange of personnel
J. Heyrovsky Institute of Physical Chemistry Czech Republic (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Dr. Bernd Winter/ Helmholtz Zentrum Berlin Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Research Infrastructure

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
27th Summer School and International Symposium on the Physics of Ionized Gases (SPIG 2014) Talk given at a conference Role of symmetry lowering in DEA 26.08.2014 Belgrade, Serbien Fedor Juraj;
Chemistry for electron-induced nanolitography (CELINA) Talk given at a conference Electron-induced dissociative processes in FEBIP precursors and related molecules 19.03.2014 Erlangen, Germany Fedor Juraj;
XIXth Symposium on Atomic, Cluster and Surface Physics (SASP) Talk given at a conference Molecular dynamics probed with free electrons: Dissociation mediated by */σ* mixing 09.02.2014 Obergurgl, Austria Fedor Juraj;
XXVIII International Conference on Photonic, Electronic and Atomic Collisions Talk given at a conference Growth of ice nanoparticles via uptake of individual molecules 24.07.2013 Lanzhou, China, China Fedor Juraj;
XVIII International Symposium on Electron-Molecule Collisions and Swarms Talk given at a conference Dissociation dynamics of resonant anion states in small molecules 19.07.2013 Kanazawa, Japan, Japan Fedor Juraj;
XXV. International symposium on molecular beams Talk given at a conference Growth of ice nanoparticles via uptake o individual molecules: Pickup cross sections 09.06.2013 Prague, Czech Republic, Czech Republic Fedor Juraj;
XIX. Symposium on applications of plasma processes Talk given at a conference Molecular motion probed with free electrons 26.01.2013 Vratna dolina, Slovakia, Slovakia Fedor Juraj;
Electron-controlled chemical litography Talk given at a conference Electron-molecule-cluster collisions 18.05.2012 Stykkishomur, Iceland, Iceland Fedor Juraj;
Electron-driven processes at the molecular level Talk given at a conference Dissociative electron attachment dynamics in small molecules 19.10.2011 Prague, Czech Republic, Czech Republic Fedor Juraj;


Communication with the public

Communication Title Media Place Year
New media (web, blogs, podcasts, news feeds etc.) Chemie: Freiburger Forscher lösen eine wissenschaftliche Kontroverse Western Switzerland German-speaking Switzerland 2013

Associated projects

Number Title Start Funding scheme
143984 Does dissociative electron attachment to tetrahydrofuran produce metastable anions? 01.06.2012 International short research visits

Abstract

This Ambizione research project aims towards understanding of the processes at liquid interfaces induced by free low-energy electrons. Electron-induced processes occurring in the liquid environment play an important role in several scientific fields, e.g., radiation damage to biological tissue or atmospheric chemistry. In contrary to the gas and solid phase targets which have been intensively studied in recent years, the processes occurring at collisions of free electrons with liquid phase targets are almost completely unknown. The reason for this - the difficulty in bringing the surface of clean volatile liquid into high vacuum environment - has been recently overcome by the invention of the liquid micro-jet technique at MPI Göttingen, Germany. We propose a combination of the liquid micro-jet technique with the unique electron spectroscopy infrastructure available at the Department of Chemistry, University of Fribourg, in order to fill this important gap in the field of electron-induced chemistry.
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