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One of the primary Ion Beam Analysis (IBA) techniques employed for the determination of sample composition and the performance of in-depth analysis is Time of Flight – Elastic Recoil Detection Analysis (ToF – ERDA). The technique's unique advantage is its ability to detect and distinguish light elements, including hydrogen, deuteron, and lithium (up to aluminum or higher), in a variety of samples. Additionally, it can be used to estimate the isotopic concentrations of elements. Two Multichannel Plate (MCP) detectors are employed to accurately determine the time of flight between various ions. When an ion passes through a very thin carbon foil, which is affixed in a Busch configuration with the microchannel plates, these detectors are triggered. The energy loss of the ion as it passes through the foil has a significant impact on the number of emitted electrons. Nevertheless, the energy loss at the energies of interest is relatively low for hydrogen, resulting in a decrease in the overall detection efficiency of the ToF-ERDA setup.
LiF and Al2O3 have been employed as coatings on carbon foils in order to enhance the number of emitted electrons in a variety of ToF-ERDA setups [1] [2]. The objective of this study is to examine the feasibility of substituting these materials with more appropriate alternatives. The evaporation technique was employed to construct a variety of foils in the accelerator laboratory of N.C.S.R. "Demokritos." The Dual Microprobe setup of the Laboratory for Ion Beam Interaction at Ruđer Bošković Institute (RBI) was utilized to completely characterize them through the application of complementary IBA techniques. Furthermore, the single ion impact detection set-up [3] was used at the end station of the Ion Microprobe in the same laboratory to evaluate their efficiency as potential trigger foils. The secondary electron emission was determined and contrasted among the various foils using this method. The analysis's findings will be presented and discussed.
[1] Z. Siketić, I. B. Radović, and M. Jakšić, “Development of a time-of-flight spectrometer at the Ruder Bošković Institute in Zagreb,” Nucl. Instruments Methods Phys. Res. Sect. B Beam Interact. with Mater. Atoms, vol. 266, no. 8, pp. 1328–1332, Apr. 2008, doi: 10.1016/J.NIMB.2007.12.070.
[2] M. Laitinen, M. Rossi, J. Julin, and T. Sajavaara, “Time-of-flight – Energy spectrometer for elemental depth profiling – Jyväskylä design,” Nucl. Instruments Methods Phys. Res. Sect. B Beam Interact. with Mater. Atoms, vol. 337, pp. 55–61, Oct. 2014, doi: 10.1016/J.NIMB.2014.07.001.
[3] R. W. Smith, M. Karlušić, and M. Jakšić, “Single ion hit detection set-up for the Zagreb ion microprobe,” Nucl. Instruments Methods Phys. Res. Sect. B Beam Interact. with Mater. Atoms, vol. 277, pp. 140–144, Apr. 2012, doi: 10.1016/J.NIMB.2011.12.036.