<p>This thesis reports on the development and characteristics of an ion reflection spectrometer designed to operate in the 20 - 150 KeV range with specific application to near surface analysis of solids. The work is divided into two parts.</p> <p>Part I details the design, operation and calibration of the systems within the spectrometer. They include a high resolution electrostatic analyzer and a premium solid state detector cooled to provide an excellent resolution figure. Control of the spectrometer is via a small minicomputer programmed with machine language in a real-time operating environment. Both energy and geometrical calibration procedures as well as results are provided. Examples are given which illustrate the performance characteristics of the spectrometer. Various corrections to both ESA (eg. neutral component) and solid state detector (eg. pulse height defect) results are determined and applied where necessary.</p> <p>Part II shows the capabilities of the spectrometer as exhibited during the study of three areas of the medium energy ion-solid interactions. The first is an examination of the large angle scattering cross section behaviour for various incident ions (1 ≤ Z₁ ≤ 10) in gold layers. The results are compared to current theoretical predictions and experimental values. The second is an investigation of the neutralization of charged particles (1 ≤ Z₁ ≤ 10) as they exit from clean gold surfaces. Other experimental values, as well as various theories are discussed in relation to the observed results. The last study includes the determination of the stopping of light mass particles (H,He) in Au films. These values are obtained after the application of several corrections based on methods and results of the previous sections. The stopping powers are related to other experimental results.</p> <p>From the foregoing investigations, it is concluded that the state of medium energy ion-solid interactions is by no means as quantitative as in the higher energy regime. The energy loss processes and charge neutralization behaviour are not well understood so that there is a great need for reliable and accurate experimental measurements that can provide a solid foundation on which to base a better theoretical model of the processes involved.</p> / Doctor of Philosophy (PhD)
| Identifer | oai:union.ndltd.org:mcmaster.ca/oai:macsphere.mcmaster.ca:11375/11226 |
| Date | 03 1900 |
| Creators | Poehlman, Frederick Skipper William |
| Contributors | Thompson, D.A., Electrical Engineering |
| Source Sets | McMaster University |
| Detected Language | English |
| Type | thesis |
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