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- Helmholtz Institute JenaDE407 papers
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17 papers · 2 filters
Multiple photodetachment of carbon anions via single and double core-hole creation
A. Perry-Sassmannshausen, T. Buhr, A. Borovik +8
We report on new measurements of m-fold photodetachment (m=2-5) of carbon anions via K-shell excitation and ionization. The experiments were carried out employing the photon-ion me…
Two-color phase-of-the-phase spectroscopy applied to nonperturbative electron-positron pair production in strong oscillating electric fields
J. Braß, R. Milbradt, S. Villalba-Chávez +2
Production of electron-positron pairs from vacuum in strong bichromatic electric fields, oscillating in time with a fundamental frequency and its second harmonic, is studied. Stron…
High Resolution Photoexcitation Measurements Exacerbate the Long-Standing Fe XVII Oscillator Strength Problem
Steffen Kühn, Chintan Shah, José R. Crespo López-Urrutia +29
For more than 40 years, most astrophysical observations and laboratory studies of two key soft x-ray diagnostic transitions, and , in Fe XVII ions found oscillator…
Modification of multipole transitions by twisted light
Sabrina. A. -L. Schulz, Stephan Fritzsche, Robert A. Müller +1
A theoretical analysis is presented for the excitation of single many-electron atoms and ions by twisted (or vortex) light. Special emphasis is put on excitations that can proceed…
Near L-edge photoionization of triply charged iron ions
Randolf Beerwerth, Ticia Buhr, Alexander Perry-Saßmannshausen +12
Relative cross sections for -fold photoionization () of Fe by single photon absorption were measured employing the photon-ion merged-beams setup PIPE at the…
QED radiative corrections to the P-P fine-structure in fluorinelike ions
A. V. Volotka, M. Bilal, R. Beerwerth +3
Ab initio calculations of QED radiative corrections to the - fine-structure transition energy are performed for selected F-like ions. These calculations are…