Initial kinetic energy of secondary ions desorbed by ²⁵²Cf fission fragments /
| Main Author: | |
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| Other Authors: | , , , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1988.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Abstract: | One of the newer and more radical methods of desorbing an ion from a solid surface for analysis in a mass spectrometer, is to bombard the surface with very high energy particles, such as the -100 MeV fission fragments produced by the spontaneous fission of [252]Cf. The bombardment of a sample surface with these high energy particles shows the unique ability to desorb very large and relatively fragile molecules. This includes molecules such as proteins which can not be desorbed by other techniques using much lower energy ion beams. The lower energy beams tend to produce extensive fragmentation in the desorbed molecules with little or no production of the parent molecular ion. This leads to the question of how a high energy ion beam is able to deposit just enough energy to the molecule of interest without inducing fragmentation. Several models have been proposed to account for this. To test these models, experimental data must be obtained as to the exact amount of energy received by the desorbed ions. This data can then be compared with the theoretical predictions. A series of molecules on various substrates have been analysed to build a body of data for comparison. |
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| Item Description: | Typescript (photocopy). Vita. "Major subject: Chemistry." |
| Physical Description: | xviii, 307 leaves : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references (leaves 299-301). |