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The 2s(1/2)-2p(1/2) energy splittings DeltaE(L) of the lithiumlike ions 19779Au76+, 20882Pb79+, and 23892U89+ have been measured at the Experimental Storage Ring, utilizing low energy dielectronic recombination. The resonance energies in total 41 different 1s(2) 2p(1/2)nl(j(')) (n > or =20) autoionizing Rydberg states populated in the dielectronic capture(More)
In connection with the work for the next generation VLBI2010 Global Observing System (VGOS) of the International VLBI Service for Geodesy and Astrometry, a new scheduling package (Vie_Sched) has been developed at the Vienna University of Technology as a part of the Vienna VLBI Software. In addition to the classical station-based approach it is equipped with(More)
During the last year detailed data analysis of previous photorecombination measurements with Li-like uranium U 89+ was performed. Photorecombination (PR) is the capture of a free electron under emission of one or more photons. In the independent processes approximation (IPA) PR usually is described to proceed either via a non-resonant direct pathway,(More)
Recombination involving the core excitation of two electrons, which may be termed trielectronic recombination, has been experimentally identified for the first time. Using Cl13+ ions circulating in the TSR heavy-ion storage ring, we have observed surprisingly strong low-energy trielectronic recombination resonances, comparable to the dielectronic process.(More)
The measurement of isotopic shifts utilizing dielectronic recombination (DR) of very heavy few electron ions (nuclear charge Z > 50) is a very promising new approach for the investigation of nuclear properties. In particular if an score electron is excited during the initial dielectronic capture (DC) process the large change in the overlap of atomic and(More)
We report here results of a state selective radiative re-combination experiment in which the K-shell radiative re-combination (K-RR) rates for U 92+ ions interacting with low-energy electrons in electron cooler were measured for a different relative (off-cooling) energies in the range 0-1000 meV. The experiment has been performed at the ESR storage ring at(More)
The radiative recombination (RR) process has been studied extensively in the last years in ion storage rings, where ion beams are cooled by dense, equal-velocity electron beams in an electron cooler. The radiative recombination of high-Z bare ions with cooling electrons can be treated within the nonrelativistic dipole approximation (NDA) which is expected(More)
The recent launches of the X-ray satellite observatories, Chandra and XMM-Newton, have opened up a new era in studies of active galactic nuclei (AGNs). The high resolution spectroscopy made possible by these observatories has revealed the presence of previously unknown gas phases in AGNs. Here we discuss the importance for understanding these gas phases of(More)
Isotope shifts in dielectronic recombination spectra were studied for Li-like (A)Nd(57+) ions with A=142 and A=150. From the displacement of resonance positions energy shifts deltaE(142 150)(2s-2p(1/2))=40.2(3)(6) meV [(stat)(sys)] and deltaE(142 150)(2s-2p(3/2))=42.3(12)(20) meV of 2s-2p(j) transitions were deduced. An evaluation of these values within a(More)
D. Banaś,1 M. Pajek,1 A. Surzhykov,2 Th. Stöhlker,2,3,4 C. Brandau,3,5 A. Gumberidze,6 C. Kozhuharov,3 H. F. Beyer,3 S. Böhm,5 F. Bosch,3 M. Czarnota,1 S. Chatterjee,3,* J.-Cl. Dousse,7 S. Fritzsche,2,8 S. Hagmann,3 D. Liesen,3 P. H. Mokler,3 A. Müller,5 A. Kumar,3 R. Reuschl,3 D. Sierpowski,9 U. Spillmann,3 J. Szlachetko,1,7 S. Tashenov,2,10 S.(More)