Inner-shell photoionization of Ar² ions using synchrotron radiation and a Penning ion trap /
| Main Author: | |
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| Other Authors: | , , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1991.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Abstract: | Broadband synchrotron radiation was used to photoionize K-shell electrons of Ar[^2+] ions in an ion cloud target. The ion target was produced by electron impact ionization, and contained inside a Penning ion trap. The ionic charge distribution resulting from vacancy cascading and electron shake-off was measured. Following corrections for the effects of electron capture, the experimental results were compared with a simple prediction that the ionic charge distribution would be the same as the distribution resulting from a K-shell vacancy in neutral argon shifted upward by two charge units. The most probable charge state, Ar[^6+], was correctly predicted, but not the relative abundances of the ionic charge distribution, even when including possible lowered shake-off probabilities. A more detailed analysis of the vacancy cascade and electron shake-off is necessary to explain the experimental results. These are the first measurements of inner-shell photoionization of multi-charged ions using synchrotron radiation. The results are encouraging for future experiments involving inner-shell photoionization of ions using third generation synchrotron radiation facilities, which are presently being constructed world wide. Also measured were the electron capture rate coefficients for Ar[^q+] on H2 (q=3, 4, 5, and 6), using the same apparatus. These measurements were necessary to properly analyze the charge changing of the photoions before signal detection... |
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| Item Description: | Typescript (photocopy). Vita. "Major subject: Physics." |
| Physical Description: | xiii, 134 leaves : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references. |