Journalartikel

Jahr der Veröffentlichung: 2014

Zeitschrift: Journal of Physics B: Atomic, Molecular and Optical Physics

Bandnummer: 47

Heftnummer: 21

ISSN: 0953-4075

eISSN: 1361-6455

Open Access Status: Hybrid

DOI Link: https://doi.org/10.1088/0953-4075/47/21/215202

Verlag: IOP Publishing

Abstract: 
We report on experimental and theoretical results for the photoionization of Ag-like xenon ions, Xe7+, in the photon energy range 95-145 eV. The measurements were carried out at the Advanced Light Source at an energy resolution of Delta E = 65 meV with additional measurements made at Delta E = 28 meV and 39 meV. Small resonance features below the ground-state ionization threshold, at about 106 eV, are due to the presence of metastable Xe7+(4d(10)4f F-2 degrees(5/2, 7/2)) ions in the ion beam. On the basis of the accompanying theoretical calculations using the Dirac atomic R-matrix codes (DARC), an admixture of only a few percent of metastable ions in the parent ion beam is inferred, with almost 100% of the parent ions in the (4d(10)5s S-2(1/2)) ground level. The cross section is dominated by a very strong resonance associated with 4d -> 5f excitation and subsequent autoionization. This prominent feature in the measured spectrum is the 4d(9)5s5f(2)P degrees resonance located at (122.139 +/- 0.01) eV. An absolute peak cross section of 1.2 Gigabarns was measured at 38 meV energy resolution. The experimental natural width Gamma = 76 +/- 3 meV of this resonance compares well with the theoretical estimate of 88 meV obtained from the DARC calculation with 249 target states. Given the complexity of the system, overall satisfactory agreement between theory and experiment is obtained for the photon energy region investigated.

Harvard-Zitierstil: Müller, A., Schippers, S., Esteves-Macaluso, D., Habibi, M., Aguilar, A., Kilcoyne, A., et al. (2014) Valence-shell photoionization of Ag-like Xe7+ ions: experiment and theory, Journal of Physics B: Atomic, Molecular and Optical Physics, 47(21), Article 215202. https://doi.org/10.1088/0953-4075/47/21/215202

APA-Zitierstil: Müller, A., Schippers, S., Esteves-Macaluso, D., Habibi, M., Aguilar, A., Kilcoyne, A., Phaneuf, R., Ballance, C., & McLaughlin, B. (2014). Valence-shell photoionization of Ag-like Xe7+ ions: experiment and theory. Journal of Physics B: Atomic, Molecular and Optical Physics. 47(21), Article 215202. https://doi.org/10.1088/0953-4075/47/21/215202