Theoretical and experimental study of the extreme ultraviolet photoabsorption spectrum of triply ionized yttrium
| Autor: | P. Yeates, V. L. Sukhorukov, Ph. V. Demekhin, John Costello, I. D. Petrov, L A Demekhina, B. M. Lagutin, Jofre Pedregosa-Gutierrez, Eugene T. Kennedy, P. van Kampen, Jason B. Greenwood, M. W. D. Mansfield, J-P Mosnier |
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| Rok vydání: | 2004 |
| Předmět: | |
| Zdroj: | Journal of Physics B: Atomic, Molecular and Optical Physics. 37:4663-4680 |
| ISSN: | 1361-6455 0953-4075 |
| Popis: | The photoabsorption spectrum of Kr-like Y3+ ions in the very soft x-ray/extreme ultraviolet spectral range where single (4s–np) and double (4p4p–nln'l') electron excitations dominate has been measured using a dual laser plasma photoabsorption technique. The corresponding photoionization cross section has been computed within the framework of the configuration interaction Pauli–Fock approach. The calculations confirm that the 4s–5p resonance drops below the 4p ionization threshold so that the first member of the 4s–np photoionization resonance series becomes 4s–6p. Also, whereas the first such series member in Rb+ and Sr2+ appears as a window resonance, in Y3+ it switches to a normal, slightly asymmetric absorption peak. In addition, although the 4s–5p1/2 resonances in the 4p51/2 and 4p53/2 continua are mirror images in Rb+ and Sr2+ and hence cancel each other, they exhibit quite different shapes in Y3+ and hence we observe the residual signature of the 4s–6p1/2 resonance as a weak partner to the main 4s–6p3/2 resonance. |
| Databáze: | OpenAIRE |
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