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Berlin 2001 – wissenschaftliches Programm

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MO: Molekülphysik

MO 9: Photoionisation I (joint session A and MO)

MO 9.12: Vortrag

Donnerstag, 5. April 2001, 18:30–18:45, H1012

Photoionization of Ca+ ions by synchrotron radiation — •S. Schippers1, A. Müller1, A. Covington2, A. Aguilar2, G. Hinojo sa2, R.A. Phaneuf2, M. Sant’Anna3, A.S. Schlachter3, J. D. Bozek3, and C. Cisneros41Institut für Kernphysik, Universität Giessen, Germany — 2University of Nevada, Reno, USA — 3Advanced Light Source, Lawrence Berkeley Laboratory, California, USA — 4Centro de Ciencas Fisicas, UNAM, Cuernavaca, Mexico

Multiply excited states play an important role in electron-ion and photon-ion interactions. Ionization cross sections are often dominated by indirect processes forming intermediate autoionizing states, which then decay into the different final channels observed in various types of experiments. As a consequence of time-reversal identical intermediate states are involved in both processes. Measurements of photoionization of Aq+ ions and photorecombination of A(q+1)+ ions complement one another, revealing information about identical intermediate states and their decay properties. As the first of a series of measurements on ions of the potassium isoelectronic sequence, photoionization of Ca+ was investigated in the energy range from about 20 to 50 eV. One objective was to determine the energy and line width of the rapidly decaying 3p5 3d2  2F state which may be populated by the photoionization of 3p6 3d metastable Ca+. The measured energy of 29.4 eV differs by 0.6 eV from a recent theoretical prediction [1]. The observed line strength together with this calculation and previous absolute measurements [2] suggests a metastable fraction of 2−3 % of the parent ion beam. Furthermore we find evidence of interference between direct 3p inner-shell photoionization and resonances due to double core-excitation.

[1] J. E. Hansen and P. Quinet, J. Elec. Spectrosc. Rel. Phenom. 79, 307 (1996)

[2] I. C. Lyon, B. Peart, K. Dolder, and J.B. West, J. Phys. B 20, 1471 (1987)


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