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A: Atomphysik

A 9: Poster 1

A 9.23: Poster

Dienstag, 23. März 2004, 14:00–16:00, Schellingstr. 3

K-shell photoionization of multiply charged boron and carbon ions — •A. Müller¹, S. Schippers¹, R. A. Phaneuf², A. Aguilar^2,3, S. Scully², E. Emmons², M. Gharaibeh^2,3, A. S. Schlachter³, J. D. Bozek³, C. Cisneros⁴, and B. M. McLaughlin⁵ — ¹Justus-Liebig-Univ., Giessen — ²Univ. of Nevada, Reno, USA — ³Advanced Light Source - ALS, Berkeley, USA — ⁴UNAM, Cuernavaca, Mexico — ⁵Queen’s Univ., Belfast, UK

K-shell photoexcitation of B¹⁺, B²⁺, and C³⁺ ions has been studied in a photon-ion merged-beams experiment at the ALS. Absolute cross sections and resonance strengths for photoionization were measured. Lifetimes of the most strongly contributing intermediate highly excited states could be determined from the natural widths of resonances by exploiting the available experimental energy resolution of up to E/ΔE=20 000 in the present range of interest. The results compare well with R-matrix calculations and with experimental data obtained for the time-reversed processes of photorecombination of ions, such as e+B³⁺ → B²⁺ + hν. The present work improves the accuracy of known level energies by about one order of magnitude. On the basis of detailed balance it shows the consistency of experimental data obtained by completely different techniques at a synchrotron light source and at heavy-ion storage rings.