The RMT method for many-electron atomic systems in intense short-pulse laser light

Moore, L. R.; Lysaght, Michael; Nikolopoulos, L. A. A.; Parker, James; Hart, H. W. van der; Taylor, K T

doi:10.1080/09500340.2011.559315

Cited by 98 publications

(133 citation statements)

References 42 publications

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“…However, it would be very useful to develop this capability in other theoretical methods and techniques as well, such as, for example, time-dependent R-matrix theory [12][13][14][15]. The most recent implementation of time-dependent R-matrix theory, named R-matrix theory including time dependence (RMT), is the most efficient implementation for large-scale studies because it provides better stability when many angular momenta are included and provides better scope for exploitation of massively parallel computing facilities.…”

Section: Introductionmentioning

confidence: 99%

Probing spin-orbit-interaction-induced electron dynamics in the carbon atom by multiphoton ionization

Rey

Hart

2014

Phys. Rev. A

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Section: Introductionmentioning

confidence: 99%

Probing spin-orbit-interaction-induced electron dynamics in the carbon atom by multiphoton ionization

Rey

Hart

2014

Phys. Rev. A

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“…Although several other time-dependent R-matrix methods have emerged in recent years [16][17][18], RMT exhibits orders-of-magnitude improvements in efficiency, primarily because it employs finite-difference (FD) techniques to model the one-electron wave function in the outer region. RMT merges the outer region FD model with a B-Spline-based, R-matrix basis set for the multielectron inner region, allowing efficient calculations accounting for atomic structure and correlation effects [19].…”

mentioning

confidence: 99%

Electron rescattering in strong-field photodetachment ofF−

et al. 2015

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We present ab initio studies of photoelectron spectra for above threshold detachment (ATD) of F − anions in short, 1300 nm and 1800 nm laser pulses. We identify and assess the importance of electron rescattering in strong-field photodetachment of a negative ion through comparison with an analytic, Keldysh-type approach, demonstrating the capability of ab-initio computation in the challenging near-IR regime. We further assess the influence of the strong electron correlation on the photodetachment.PACS numbers: 32.80.Gc 31.15.VElectron rescattering is one of the fundamental processes occuring in the interaction between matter and intense light fields [1]. The mechanism is a critical part of the well known three-step or recollision model for high harmonic generation (HHG) or strong field double ionisation. According to the model an electron is first ionised, then driven by a strong laser field, before recolliding with the parent ion, either recombining, leading to HHG [2,3], or rescattering, leading to high-energy electron emission [4,5], or non-sequential double ionisation [6].Electron rescattering also encodes structural information about the residual ion into the wavepacket of the ejected electron and can thus be exploited as an experimental probe of the structure of the parent ion [1]. The technique is especially sensitive as the current density of a recolliding electron wavepacket exceeds that of conventional electron sources by several orders of magnitude [7]. Furthermore, the inherently subcycle and phase-locked nature of the recollision process gives access to electron dynamics on the attosecond scale, via information embedded in the photoelectron spectrum [8,9].One of the open questions in strong-field science concerns the importance of electron rescattering for negative ions. Significant progress has been made in understanding and controlling the equivalent process in neutral atoms and positive ions [10], but above-threshold detachment (ATD) presents a different challenge. The small binding energy allows detachment at low intensities. Hence to reach significant recollision energies, nearinfrared (NIR) laser fields are required. In addition, the absence of the Coulomb potential makes it easier for the electron wavepacket to spread out, reducing the effect of rescattering [4,5]. While evidence for rescattering from negative ions has been found experimentally [11], no verification has yet been provided from ab initio theory. A theoretical approach, based on first order correction to the strong field approximation, was able to reproduce experimental results from Br − and F − , [12] but a more recent study, using a numerical solution of the time-dependent Schrödinger equation (TDSE), found "no qualitative evidence of rescattering" for H − [13]. In this report we demonstrate that ab-initio theory can be used to investigate rescattering in the NIR regime.An additional complication in the description of negative ions is the much larger influence of dielectronicrepulsion. Several approximate methods have been empl...

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“…An outer-region approach based on R-matrix propagation techniques [12] has already been applied successfully to describe two-photon ionization of Neon [14] and ultrafast dynamics of a 2s2p 2 wavepacket in C + [15,16,17]. More recently, R-matrix inner region techniques have been combined with an outer-region approach which employs a finite-difference approach to obtain the R-matrix with time dependence (RMT) approach [13,18].…”

Section: Introductionmentioning

confidence: 99%

Ultra-fast spin dynamics in the 2s2p²configuration of C⁺studied by time-dependentR-matrix theory

Hutchinson¹,

Lysaght²,

Hart³

2011

J. Phys. B: At. Mol. Opt. Phys.

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We employ time-dependent R-matrix theory to study ultra-fast dynamics in the doublet 2s2p 2 configuration of C + for a total magnetic quantum number M = 1. In contrast to the dynamics observed for M = 0, ultra-fast dynamics for M = 1 is governed by spin dynamics in which the 2s electron acts as a flag rather than a spectator electron. Under the assumption that m S = 1/2, m 2s = 1/2 allows spin dynamics involving the two 2p electrons, whereas m 2s = −1/2 prevents spin dynamics of the two 2p electrons. For a pump-probe pulse scheme with hω pump = 10.9 eV and hω probe = 16.3 eV and both pulses six cycles long, little sign of spin dynamics is observed in the total ionization probability. Signs of spin dynamics can be observed, however, in the ejected-electron momentum distributions. We demonstrate that the ejected-electron momentum distributions can be used for unaligned targets to separate the contributions of initial M = 0 and M = 1 levels. This would, in principle, allow unaligned target ions to be used to obtain information on the different dynamics in the 2s2p 2 configuration for the M = 0 and M = 1 levels from a single experiment.

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The RMT method for many-electron atomic systems in intense short-pulse laser light

Cited by 98 publications

References 42 publications

Probing spin-orbit-interaction-induced electron dynamics in the carbon atom by multiphoton ionization

Probing spin-orbit-interaction-induced electron dynamics in the carbon atom by multiphoton ionization

Electron rescattering in strong-field photodetachment ofF−

Ultra-fast spin dynamics in the 2s2p²configuration of C⁺studied by time-dependentR-matrix theory

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The RMT method for many-electron atomic systems in intense short-pulse laser light

Cited by 98 publications

References 42 publications

Probing spin-orbit-interaction-induced electron dynamics in the carbon atom by multiphoton ionization

Probing spin-orbit-interaction-induced electron dynamics in the carbon atom by multiphoton ionization

Electron rescattering in strong-field photodetachment ofF−

Ultra-fast spin dynamics in the 2s2p2configuration of C+studied by time-dependentR-matrix theory

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Ultra-fast spin dynamics in the 2s2p²configuration of C⁺studied by time-dependentR-matrix theory