| Autor: |
K.B. MacAdam, Håkan Danared, Stefan Schippers, W. Shi, S. Böhm, N Eklöw, Gordon H. Dunn, R. Schuch, N. Djurić, M. Fogel, Alfred Müller |
| Rok vydání: |
2003 |
| Předmět: |
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| Zdroj: |
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 205:370-373 |
| ISSN: |
0168-583X |
| DOI: |
10.1016/s0168-583x(03)00558-5 |
| Popis: |
Field-enhanced dielectronic recombination (DR) cross-sections differential in the main quantum number n have been measured for N4+ ions. The n-differential data were obtained at the heavy ion storage ring CRYRING by increasing the ion energy in two steps from 3 to 5 MeV/u and from 5 to 7.5 MeV/u. The accompanying increase of the magnetic field in the storage – ring dipole magnets leads to a decrease of the cutoff quantum number nc associated with the field ionization of intermediate N3+(1s22p nl) states. By comparing measurements at two different ion energies the enhancement of DR due to electromagnetic fields is derived for the narrow bandwidths of Rydberg states n≈17–21 and 19–24. The applied electric fields ranged from 0 to 300 V/cm. The observed enhancement was up to a factor of 1.9 for the bandwidth n≈17–21 and up to 2.3 for the bandwidth n≈19–24, respectively. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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