| Autor: |
I. F. Bubb, Rick Franich, P. N. Johnston |
| Rok vydání: |
2004 |
| Předmět: |
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| Zdroj: |
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. :87-94 |
| ISSN: |
0168-583X |
| DOI: |
10.1016/j.nimb.2004.01.033 |
| Popis: |
The interpretation of ion beam analysis data requires accurate simulation of the output spectra. The recent trend towards Monte Carlo (MC) simulation, particularly for techniques using heavy ions, follows in recognition of limitations in traditional analytical approaches. MC modeling is ideally suited to reproducing the pronounced broadening and tailing effects of multiple and plural scattering typically seen in heavy ion elastic recoil detection analysis spectra. The efficiency of the MC modelling process can be improved by exploiting kinematic relationships and experimental parameters to reduce the time spent following ion paths which will not lead to detection events of interest. The efficiency enhancement approach used is different to that of the Helsinki group [Nucl. Instr. and Meth. B 174 (2001) 163]. Another difference is that the code developed at RMIT models the scattered ion spectra in addition to the recoil data. These spectra can be important in cases where the beam species is also present in the sample and therefore the scattered ion contribution needs to be separated from the recoil spectra, or where signals from scattered ions and recoils of similar atomic mass cannot be resolved. An example of the latter case is presented where the simulation is used to interpret the overlapped data. The code has also been used to study the contribution of plural and multiple scattering to the shape of the experimental output spectra. It is shown that the spectral shape is strongly dependent upon the inclusion of these effects. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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