27 citations · 98 across the 8 of their papers we have counts for
8 papers
Calculations of Delbrück scattering to all orders in
J. Sommerfeldt, V. A. Yerokhin, R. A. Müller +3
We present a theoretical method to calculate Delbrück scattering amplitudes. Our formalism is based on the exact analytical Dirac-Coulomb Green's function and, therefore, accounts…
Impact of Earth's gravity on Gaussian beam propagation in hemispherical cavities
Sebastian Ulbricht, Johannes Dickmann, Robert A. Müller +2
We theoretically investigate the influence of gravity on laser light in a hemispherical optical cavity, operating on Earth. The propagation of light in such a cavity is modeled by…
Gravitational light deflection in Earth-based laser cavity experiments
Sebastian Ulbricht, Johannes Dickmann, Robert A. Müller +2
As known from Einstein's theory of general relativity, the propagation of light in the presence of a massive object is affected by gravity. In this work, we discuss whether the eff…
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…
Gravitational effects on geonium and free electron -factor measurements in a Penning trap
Sebastian Ulbricht, Robert Alexander Müller, Andrey Surzhykov
We present a theoretical analysis of an electron confined by a Penning trap, also known as geonium, that is affected by gravity. In particular, we investigate the gravitational inf…
Electronic level structure of in the range of the isomer energy
David-Marcel Meier, Johannes Thielking, Przemysław Głowacki +4
Using resonant two-step laser excitation of trapped ions, we observe 166 previously unknown energy levels of even parity within the energy range from 7.8 to 9…
Excitation of the Th nucleus via a two-photon electronic transition
Robert A. Müller, Andrey V. Volotka, Andrey Surzhykov
We investigate the process of nuclear excitation via a two-photon electron transition (NETP) for the case of the doubly charged thorium. The theory of the NETP process has been dev…
Two-color above threshold ionization of atoms and ions in XUV Bessel beams and combined with intense laser light
D. Seipt, R. A. Müller, A. Surzhykov +1
The two-color above-threshold ionization (ATI) of atoms and ions is investigated for a vortex Bessel beam in the presence of a strong near-infrared (NIR) light field. While the pho…