Interaction of Energetic Ions with Matter and their use for characterisation and fabrication of New Materials

The Tandem Accelerator Laboratory and the Ion Technology Center, Uppsala, Sweden.

Research

The projects concerning material science in the Division of Ion Physics have been focused on four aspects: developing the Ion Beam Analysis (IBA) techniques, characterisation and fabrication of new materials, and technical serves.

IBA techniques:
Two IBA techniques, Rutherford Backscattering Spectrometry (RBS) and Elastic Recoil Detection Analysis (ERDA), are running smoothly at the material research beamline as standard techniques to fit various material analysis requirements. Random RBS is an excellent non-destructive method for rapid elemental depth profiling, surface composition, element identification and trace impurity concentration. Channeling RBS together with angular scans are efficient for damage analysis and phase changes in single crystals, epitaxial layers and thin films and give defect and foreign impurity site locations. The ERDA combined with a multi-dispersive detector telescope, such as a high resolution Time-of-Flight (ToF) detector
telescope or a thin Si Delta E detector, provides simultaneous and quantitative elemental depth distributions for light-, medium- and heavy-mass elements in both light and heavy matrices. Over about the last 15 years, ToF-E ERDA and thin Si Delta E-E ERDA have been actively developed in the Uppsala Tandem Laboratory.

In order to improve the existing ERDA system and overcome the limitations of both ToF telescope (low detection efficiency for light elements) and Si delta E detectors (short lifetime), we are constructing and testing high-sensitive gas-filled detector E detectors. The Gas ionisation detectors offer a few advantages: insensibility to the radiation effects, large solid angle, capable of adaptation to the energy range by changing the gas pressure, good energy resolution, small ionisation defect, and long life time.

Characterisation and fabrication of new materials:

The research within the field of Ion Physics focuses on the interaction of ions with materials. The research focuses on the following:

  • Fundamental aspects of ion-solid interactions.
  • Characterisation of materials with ion beam methods.
  • Modification of materials with ion beams.
  • Characterisation of radiation through its interaction with matter.

Characterisation and fabrication of new materials:

The material research beamline in the National Tandem Laboratory is set up to perform various implantation and analysis methods. There is a wide range of experimental techniques that can be performed:


Channeling Implantation
Rutherford Backscattering Spectrometry (RBS)
Elastic Recoil Detection Analysis (ERDA)
Particle-Induced X-ray Emission Spectrometry (PIXE)

The facility serves internal projects within the Ångström Consortium, external university projects, as well as commercial projects. This
service is non-profit. However, in order to maintain the system, there is a charge for the accelerator beam time and data analysis.

Collaboration

  • Solid State Electronics, IMIT, KTH, Sweden.
  • Pacific Northwest National Laboratory, USA.
  • Fast Neutron Research Facility, Chiang Mai University, Thailand.
  • Physics Department, Mahidol University, Bangkok, Thailand.
  • Physical Electronics, Department of Physics, University of Oslo, Norway.