# R -matrix-with-time-dependence theory for ultrafast atomic processes in arbitrary light fields

@article{Clarke2018RT, title={R -matrix-with-time-dependence theory for ultrafast atomic processes in arbitrary light fields}, author={Daniel D. A. Clarke and Gregory S J Armstrong and A. C. Brown and Hugo van der Hart}, journal={Physical Review A}, year={2018} }

We describe an ab initio and nonperturbative $R$-matrix with time-dependence theory for ultrafast atomic processes in light fields of arbitrary polarization. The theory is applicable to complex, multielectron atoms and atomic ions subject to ultrashort (particularly few-femtosecond and attosecond) laser pulses with any given ellipticity, and it generalizes previous time-dependent $R$-matrix techniques restricted to linearly polarized fields. We discuss both the fundamental equations, required…

## 28 Citations

### RMT: R-matrix with time-dependence. Solving the semi-relativistic, time-dependent Schrödinger equation for general, multielectron atoms and molecules in intense, ultrashort, arbitrarily polarized laser pulses

- PhysicsComput. Phys. Commun.
- 2020

### Electron rotational asymmetry in strong-field photodetachment from F− by circularly polarized laser pulses

- PhysicsPhysical Review A
- 2019

We use the $R$-matrix with time-dependence method to study detachment from F$^-$ in circularly-polarized laser fields of infrared wavelength. By decomposing the photoelectron momentum distribution…

### Molecular Free Electron Vortices in Photoionization by Polarization-Tailored Ultrashort Laser Pulses

- PhysicsFrontiers in Chemistry
- 2022

Atomic and molecular free electron vortices (FEVs), characterized by their spiral-shaped momentum distribution, have recently attracted a great deal of attention due to their varied shapes and their…

### Selectivity in electron emission induced by ultrashort circularly polarized laser pulses

- PhysicsPhysical Review Research
- 2021

We theoretically investigate the ionization of neonlike atoms by an intense ultrashort circularly polarized laser pulse as a function of wavelength, spanning the regime from single-photon ionization…

### Perturbative and nonperturbative photoionization of H2 and H2O using the molecular R -matrix-with-time method

- Physics
- 2020

The ab initio $R$-matrix with time method has recently been extended to allow simulation of fully nonperturbative multielectron processes in molecules driven by ultrashort arbitrarily polarized…

### Excited-state populations in the multiconfiguration time-dependent Hartree–Fock method

- PhysicsJournal of Physics B: Atomic, Molecular and Optical Physics
- 2020

We study time-dependent populations in the excited states of many-electron atoms and molecules with the multiconfiguration time-dependent Hartree–Fock method and reveal the non-stationary behavior of…

### Ellipticity dependence of excitation and ionization of argon atoms by short-pulse infrared radiation

- Physics
- 2020

When atoms or molecules are exposed to strong short-pulse infrared radiation, ionization as well as "frustrated tunneling ionization"can occur, in which some of the nearly freed electrons recombine…

### Symmetry resolved atomic photoionization phase shift by attosecond coincidence metrology

- Physics
- 2021

Attosecond chronoscopy is central to the understanding of ultrafast electron dynamics from gas to condensed phase with attosecond temporal resolution. It has, however, not yet been able to…

### Molecular strong-field approximation for photodetachment of electrons from homonuclear diatomic molecular anions

- Physics, Chemistry
- 2020

Molecular strong-field approximation is applied to above-threshold detachment of homonuclear diatomic molecular negative ions. Differences between the photodetachment amplitudes for neutral diatomic…

### Resolving Ultrafast Spin-Orbit Dynamics in Heavy Many-Electron Atoms.

- PhysicsPhysical review letters
- 2019

R-matrix with time-dependence theory, with spin-orbit effects included, is used to study krypton irradiated by two time-delayed extreme ultraviolet ultrashort pulses, to isolate the two-photon pathway.

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