Zobrazeno 1 - 10
of 2 223
pro vyhledávání: '"FRITZSCHE, S."'
Autor:
Harris, A. L., Fritzsche, S.
The elastic scattering of spinless vortex electrons on realistic target atoms has been investigated. In particular, expressions are derived in different approximations for the elastic angular-differential cross sections. We develop a distorted wave f
Externí odkaz:
http://arxiv.org/abs/2411.14558
Autor:
Soguel, R. N., Fritzsche, S.
Publikováno v:
Phys. Rev. A 108, 042807 (2023)
Relying on the redefined vacuum state approach, and based on one-particle three-loop Feynman diagrams, partial third-order interelectronic corrections to the valence electron energy shift are investigated in Li-like ions. The idea is to begin with si
Externí odkaz:
http://arxiv.org/abs/2310.12592
Autor:
Schmidt, R. P., Ramakrishna, S., Peshkov, A. A., Huntemann, N., Peik, E., Fritzsche, S., Surzhykov, A.
The twisted light modes used in modern atomic physics experiments can be contaminated by small admixtures of plane wave radiation. Although these admixtures hardly reveal themselves in the beam intensity profile, they may seriously affect the outcome
Externí odkaz:
http://arxiv.org/abs/2310.10197
Publikováno v:
Phys. Rev. A 107, 032815 (2023)
We present the systematic QED treatment of the electron correlation effects on the $g$ factor of lithiumlike ions for the wide range of nuclear charge number $Z= 14$ -- $82$. The one- and two-photon exchange corrections are evaluated rigorously withi
Externí odkaz:
http://arxiv.org/abs/2305.04245
Autor:
Schippers, S., Hamann, A., Perry-Sassmannshausen, A., Buhr, T., Müller, A., Martins, M., Reinwardt, S., Trinter, F., Fritzsche, S.
Publikováno v:
Phys. Rev. A 106 (2022) 013114
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 the photon-ion merged-beams technique at a synchrotron light source. T
Externí odkaz:
http://arxiv.org/abs/2207.07329
Autor:
Soguel, R. N., Volotka, A. V., Tryapitsyna, E. V., Glazov, D. A., Kosheleva, V. P., Fritzsche, S.
Publikováno v:
Phys. Rev. A 103, 042818 (2021)
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 QED framework utilizing the redefined vacuum formalism. In contrast to
Externí odkaz:
http://arxiv.org/abs/2206.06683
Publikováno v:
Phys. Rev. A 106, 012802 (2022)
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 redefinition of the vacuum state and its excitation as a valence-hole
Externí odkaz:
http://arxiv.org/abs/2206.06233
Publikováno v:
Phys. Rev. A 106,013118 2022
The total ionization rate of biharmonic ($\omega + 3\omega$) ionization is studied within the independent particle approximation and the third order perturbation theory. Particular attention is paid to how the polarization of the biharmonic light fie
Externí odkaz:
http://arxiv.org/abs/2204.09406
Autor:
Schippers, S., Stock, S., Buhr, T., Perry-Sassmannshausen, A., Reinwardt, S., Martins, M., Müller, A., Fritzsche, S.
Publikováno v:
The Astrophysical Journal 931 (2022) 100
Experimental and theoretical results are presented for double, triple, and quadruple photoionization of Si$^+$ and Si$^{2+}$ ions and for double photoionization of Si$^{3+}$ ions by a single photon. The experiments employed the photon-ion merged-beam
Externí odkaz:
http://arxiv.org/abs/2204.08750
The bound-electron g factor is a stringent tool for tests of the Standard Model and the search for new physics. The comparison between an experiment on the g factor of lithiumlike silicon and the two recent theoretical values revealed the discrepanci
Externí odkaz:
http://arxiv.org/abs/2201.00612