| Autor: |
J. A. Tanis, D. H. Schneider, E. M. Bernstein, K.H. Berkner, K. E. Rehm, Elliot P. Kanter, A. Belkacem, M. W. Clark, S. M. Ferguson |
| Rok vydání: |
1992 |
| Předmět: |
|
| Zdroj: |
Recombination of Atomic Ions ISBN: 9781461365372 |
| DOI: |
10.1007/978-1-4615-3470-9_25 |
| Popis: |
Dielectronic recombination1 (DR) and the analogous process resonant transfer and excitation2,3 (RTE) have been the subjects of many experiments over the past decade. Most of these experiments have struggled with the fact that the electron velocity distributions or Compton profiles were so broad that details of individual resonances could not be measured. Other than the one case of an RTE measurement4 of U90+ on H2 it has only been in the last couple of years with the development of EBITs and storage rings and electron coolers that isolated resonances could be measured. Therefore, this experiment was designed to exploit the fact that when an ion travels down a crystal axis it has been shown that the ion loses little energy because it interacts very weakly with the atoms in the crystal and in fact the primary collisions involve only valence electrons of the atoms lining a channel. Datz, et a1.5 have reported a large probability that ions travelling down a crystal axis will maintain the initial charge state even though the crystal is many times thicker than the equilibrium thickness in amorphous targets. It has been shown by Datz et al.6 that channeled ions can be used to measure resonant coherent excitation by observing the stripping of the excited ions in the beam because of the increased size of the excited ion compared to the size of the crystal channel. Also Andriamonje et al.7 and Datz et al.8 have measured radiative electron capture9 (REC) from channeled ions and in the former case have shown a strong dependence of the REC width on the crystal orientation. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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