76 citations · 267 across the 13 of their papers we have counts for
13 papers
GaDE -- GPU-acceleration of time-dependent Dirac Equation for exascale
Johanne Elise Vembe, Marcin Krotkiewski, Magnar Bjørgve +2
Modern heterogeneous high-performance computing (HPC) systems powered by advanced graphics processing unit (GPU) architectures enable accelerating computing with unprecedented perf…
Coincidence measurement of two-photon double ionization of argon through an autoionizing resonance
Sebastian Hell, Julian Späthe, Morten Førre +8
We present coincidence measurements of two-photon double-ionization (TPDI) of argon driven by femtosecond pulses tunable around 26.5 eV photon energy, which are obtained from a hig…
A Schrödinger equation for relativistic laser-matter interactions
Tor Kjellsson Lindblom, Morten Førre, Eva Lindroth +1
A semi-relativistic formulation of light-matter interaction is derived using the so called propagation gauge and the relativistic mass shift. We show that relativistic effects indu…
Alternative gauge for the description of the light-matter interaction in a relativistic framework
Tor Kjellsson, Morten Førre, Aleksander Skjerlie Simonsen +2
We present a generalized velocity gauge form of the relativistic laser-matter interaction. In comparison with the (equivalent) regular minimal coupling description, this new form o…
Envelope induced ionization dynamics beyond the dipole approximation
Aleksander Skjerlie Simonsen, Tor Kjellsson, Morten Førre +2
When atoms and molecules are ionized by laser pulses of finite duration and increasingly high intensities, the validity of the much used dipole approximation, in which the spatial…
One-photon double ionization of helium: a heuristic formula for the cross section
Morten Førre
Without a formal derivation, we propose a formula for the total and single-differential cross in the problem of one-photon double ionization of an atom. The formula is benchmarked…
Quantitative modeling of spin relaxation in quantum dots
J. P. Hansen, S. A. Sørngård, M. Førre +1
We use numerically exact diagonalization to calculate the spin-orbit and phonon-induced triplet-singlet relaxation rate in a two-electron quantum dot exposed to a tilted magnetic f…
Multiphoton ionization and stabilization of helium in superintense xuv fields
S. A. Sørngård, S. Askeland, R. Nepstad +1
Multiphoton ionization of helium is investigated in the superintense field regime, with particular emphasis on the role of the electron-electron interaction in the ionization and s…
The role of final state correlation in double ionization of helium: a master equation approach
Sølve Selstø, Tore Birkeland, Simen Kvaal +2
The process of nonsequential two-photon double ionization of helium is studied by two complementary numerical approaches. First, the time-dependent Schr{ö}dinger equation is solved…
Nonsequential Two-Photon Double Ionization of Atoms: Identifying the Mechanism
Morten Førre, Sølve Selstø, Raymond Nepstad
We develop an approximate model for the process of direct (nonsequential) two-photon double ionization of atoms. Employing the model, we calculate (generalized) total cross section…
A numerical study of two-photon ionization of helium using the Pyprop framework
R. Nepstad, T. Birkeland, M. Førre
Few-photon induced breakup of helium is studied using a newly developed ab initio numerical framework for solving the six-dimensional time-dependent Schroedinger equation. We prese…
Exact Nondipole Kramers-Henneberger Form of the Light-Atom Hamiltonian: An Application to Atomic Stabilization and Photoelectron Energy Spectra
M. Forre, S. Selsto, J. P. Hansen +1
The exact nondipole minimal-coupling Hamiltonian for an atom interacting with an explicitly time- and space-dependent laser field is transformed into the rest frame of a classical…
Strong Orientation Effects in Ionization of H by Short, Intense, High-Frequency Light Sources
S. Selsto, M. Forre, J. P. Hansen +1
We present three dimensional time-dependent calculations of ionization of arbitrarily spatially oriented H by attosecond, intense, high-frequency laser fields. The ionization…