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- Helmholtz Institute JenaDE407 papers
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10 papers · 2 filters
Laser-induced electron diffraction in the over-the-barrier ionization (OBI) regime
B. Belsa, K. M. Ziems, A. Sanchez +4
Large polyatomic molecules typically exhibit low ionization potentials, Ip, leading to over-the-barrier ionization (OBI) already at relatively low intensities (~1013 W/cm2). We rev…
Multiple Photodetachment of Oxygen Anions via K-Shell Excitation and Ionization: Direct Double-Detachment Processes and Subsequent Deexcitation Cascades
S. Schippers, A. Hamann, A. Perry-Sassmannshausen +6
Experimental cross sections for m-fold photodetachment (m=2-5) of oxygen anions via K-shell excitation and ionization were measured in the photon-energy range of 525-1500 eV using…
Redefined vacuum approach and gauge-invariant subsets in two-photon-exchange diagrams for a closed-shell system with a valence electron
R. N. Soguel, A. V. Volotka, E. V. Tryapitsyna +3
The two-photon-exchange diagrams for atoms with single valence electrons are investigated. Calculation formulas are derived for an arbitrary state within the rigorous bound-state Q…
QED approach to valence-hole excitation in closed shell systems
R. N. Soguel, A. V. Volotka, S. Fritzsche
An ab initio QED approach to treat a valence-hole excitation in closed shell systems is developed in the framework of the two-time-Green function method. The derivation considers a…
Near K-Edge Photoionization and Photoabsorption of Singly, Doubly, and Triply Charged Silicon Ions
S. Schippers, S. Stock, T. Buhr +5
Experimental and theoretical results are presented for double, triple, and quadruple photoionization of Si and Si ions and for double photoionization of Si ions b…
Polarization effects in the total rate of biharmonic ionization of atoms
J. Hofbrucker, S. Ramakrishna, A. V. Volotka +1
The total ionization rate of biharmonic () ionization is studied within the independent particle approximation and the third order perturbation theory. Particular attention…