Double-electron capture and population of Rydberg levels in slowAr8++Hecollisions
| Autor: | J. F. Wyart, B. A. Huber, S Bliman, M. Cornille |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Physics
education.field_of_study Auger effect Electron capture Population Atomic and Molecular Physics and Optics Spectral line Crystallography symbols.namesake TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY Excited state Metastability symbols Rydberg formula Atomic physics Ground state education |
| Zdroj: | Physical Review A. 56:4683-4691 |
| ISSN: | 1094-1622 1050-2947 |
| DOI: | 10.1103/physreva.56.4683 |
| Popis: | Double-electron capture by Ar{sup 8+} from He is analyzed. Since the incident ion beam contains a metastable fraction of the order 5{percent}, two distinctly behaving systems are considered: (1) Ar{sup 8+}(2p{sup 6}){sup 1}S{sub 0}+He{r_arrow}Ar{sup 6+}(2p{sup 6}nln{sup {prime}}l{sup {prime}}){sup 2S+1}L{sub J}+He{sup 2+} and (2) Ar{sup 8+}(2p{sup 5}3s){sup 3}P{sub J}+He{r_arrow}Ar{sup 6+}(2p{sup 5}3snln{sup {prime}}l{sup {prime}}){sup 2S+1}L{sub J}+He{sup 2+}. For process (1), the comparison of translational energy gain and Auger spectra, with an extensive set of calculated data, supports the conclusion of an asymmetric double-electron transfer peaking at Ar{sup 6+}(2p{sup 6}3d4f) with a Rydberg tail getting to (3lnl{sup {prime}}) with n{congruent}20 (l=1,2). For process (2), the double capture points dominantly into triply excited states Ar{sup 6+}(2p{sup 5}3s3l4l{sup {prime}}){sup 2S+1}L{sub J}. These are above the second ionization limit of the ground state Ar{sup 6+}(2p{sup 6}3s{sup 2}){sup 1}S{sub 0}. Their decay takes place via two successive Auger steps: the first ending in the intermediate levels, Ar{sup 7+}(2p{sup 5}3l3l{sup {prime}}){sup 2,4}L{sub J}. These, in turn, autoionize to the Ar{sup 8+}(2p{sup 6}){sup 1}S{sub 0} continuum. Both are identified in the Auger spectrum. These observations raise the question of the meaning of the auto transfer to Rydberg states and of correlated double capture processes. {copyright} {ital 1997} {ital Themore » American Physical Society}« less |
| Databáze: | OpenAIRE |
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