Non-destructive Inspection of Surfaces
Highly Precision Method for Nondestructive Analysis of Surfaces in a Subnanometer Depth Range
Tech Area / Field
- INS-MEA/Measuring Instruments/Instrumentation
3 Approved without Funding
Research Institute of Technology, Russia, Leningrad reg., Sosnovy Bor
- St Petersburg State University, Russia, St Petersburg
- Mughrim Associates, Inc., USA, MD, Beltsville\nGerhard Mercator Universität, Germany, Duisburg
Project summaryProject's Objective
Development of a new non-destructive technique for analysis of solid state surface layers to obtain depth-selective analysis data, which is especially efficient in a subnanometer depth range. The technique helps to study the electron and magnetic structure of layered low-dimensional magnetic systems, corrosion processes, especially at their initial stages, the structure and composition of analyte surface layers.
In the course of Project implementation it is proposed to develop a new high-sensitivity technique for analysis of surface layers in a wide range of depths from units to hundreds of nanometers, which is based on the phenomenon of total external reflection of the Mossbauer radiation. To this end, based on the theoretical and experimental work already done at NITI and Sankt-Petersburg State University, as well as on the instruments and equipment specified in the present Project, it is planned to build a prototype sample of the up-to-date system for automated highly precision non-destructive analysis.
The analytical potential of this technique will be studied on corrosion films and low-dimensional magnetic systems, e.g. magnetic metallic superlattices, as examples.
The final stage of the Project will be completed with a package of technical proposals for development of a precision experimental system to study ultrathin solid state surface layers down to subnanometer depths that will provide information on the phase composition, magnetic properties, electronic structure and their variation with depth.
Theoretical concepts allowing adequate description of the shape of Mossbauer spectrum obtained through detection of conversion electrons produced in heterogeneous media under total external reflection conditions.
Parameter optimization of the spectrometric system, design and construction of its prototype sample, defining analytical characteristics of the technique (sensitivity, selectivity, depth selectivity).
Information on the corrosion mechanism at the early stages, formation of protective layers and in-depth phase distribution of oxide films on specially prepared specimens.
Hyperfine magnetic interaction profiles on layered low-dimensional magnetic systems in ultrathin surface layers as well as in interface regions between adjacent layers.
The participation of weapons scientists and engineers in the Project will permit the most efficient, introducing of their abilities to civil activity, thus contributing to the development basic research for peaceful purposes and the international integration of scientists in accordance with the ISTS goals.
Participation of foreign collaborators in the Project is possible.
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