Population trapping in bound states during IR-assisted ultrafast photoionization of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow><mml:mi mathvariant="normal">Ne</mml:mi></mml:mrow><mml:mo>+</mml:mo></mml:msup></mml:math>

Hart, H. W. van der; Morgan, Ross A.

doi:10.1103/physreva.90.013424

Cited by 10 publications

(11 citation statements)

References 27 publications

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“…The two methods can therefore explore the influence of a different set of interactions on the electron dynamics. Through the inclusion of correlation orbitals, the RMT approach has the capability to obtain an accurate description of the dynamics of open-shell systems as well as closed-shell systems [12,13,18,19]. The capability to account for correlation in both the initial and residual ionic system is critical for this accuracy.…”

Section: Time-dependent R-matrix Theorymentioning

confidence: 99%

Harmonic generation by noble-gas atoms in the near-IR regime usingab initiotime-dependentR-matrix theory

2014

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We demonstrate the capability of ab-initio time-dependent R-matrix theory to obtain accurate harmonic generation spectra of noble-gas atoms at Near-IR wavelengths between 1200 and 1800 nm and peak intensities up to 1.8 × 10 14 W/cm 2 . To accommodate the excursion length of the ejected electron, we use an angular-momentum expansion up to Lmax = 279. The harmonic spectra show evidence of atomic structure through the presence of a Cooper minimum in harmonic generation for Kr, and of multielectron interaction through the giant resonance for Xe. The theoretical spectra agree well with those obtained experimentally.

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Section: Time-dependent R-matrix Theorymentioning

confidence: 99%

Harmonic generation by noble-gas atoms in the near-IR regime usingab initiotime-dependentR-matrix theory

2014

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“…RMT is thus the leading method able to describe atomic structure in sufficient detail to provide direct, ab initio solutions of the time-dependent Schrödinger equation (TDSE) for multielectron atoms or ions. These capabilities have been demonstrated in the investigation of photoionization of Ne + in combined infrared/XUV pulses [29]. The approach has recently been used to demonstrate the spin-orbit dynamics in the ground state of carbon with zero and nonzero initial magnetic quantum number [30].…”

Section: Introductionmentioning

confidence: 99%

Cooper minimum in singly ionized and neutral argon

et al. 2018

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We present an analysis of the appearance of the Cooper Minimum in singly ionized argon in both the photoionization cross-section (PICS) and high-harmonic generation (HHG) spectrum. We employ two computational approaches based on the same R-matrix technique to provide a coherent description of the atomic structure of the Ar + system, finding that the PICS and HHG spectrum are affected differently by the inclusion of additional residual ion states and the improved description of correlation effects. Both the PICS and HHG spectrum possess a clear minimum for all atomic structure models used, with the centre of the minimum at 55 eV in the PICS and 60 eV in the HHG spectrum for the most complete description employed. The HHG minimum is systematically shifted to higher energies with respect to the PICS minimum. We also find that the initial magnetic alignment (magnetic quantum number) of the Ar + system does not affect substantially the position and shape of the HHG minimum (given a sufficiently detailed atomic structure description), but the harmonic yield is enhanced by two-orders of magnitude for ML = 1 over ML = 0. We also perform similar calculations for neutral argon, finding that this system is more sensitive to enhancements in the atomic structure description.PACS numbers: 32.80. Rm, 42.65.Ky

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“…Soon after, the R-matrix theory including time dependence (RMT) [25][26][27][28] was proposed based on the same SP concept with the Bloch operator [29] formalism but directly treating the wave function without the R matrix. The Arnoldi Lanczos scheme [30,31] is exploited in RMT to execute the time propagation more efficiently than in TDRM, and has successfully led to various applications [32][33][34][35][36][37][38]. The TD restricted-and generalized-active-space configurationinteraction [TD-(RAS/GAS)CI] approach [39][40][41] follows the same SP strategy, and is similar to RMT but based on the finite-element discrete-variable-representation (FEDVR) functions (see, e.g., Ref.…”

Section: Introductionmentioning

confidence: 99%

Time-dependent restricted-active-space self-consistent-field theory with space partition

Miyagi

Madsen

2017

Phys. Rev. A

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Aiming at efficient numerical analysis of time-dependent (TD) many-electron dynamics of atoms involving multielectron continua, the TD restricted-active-space self-consistent-field theory with space partition (TD-RASSCF-SP) is presented. The TD-RASSCF-SP wave function is expanded in terms of TD configurationinteraction coefficients with Slater determinants composed of two kinds of TD orbitals:M orbitals are defined to be nonvanishing in the inner region (V), a small volume around the atomic nucleus, andM orbitals are nonvanishing in the large outer region (V). For detailed discussion of the SP strategy, the equations of motion are derived by two different formalisms for comparison. To ensure continuous differentiability of the wave function across the two regions, one of the formalisms makes use of the property of the finite-element discrete-variable-representation (FEDVR) functions and introduces additional time-independent orbitals. The other formalism is more general and is based on the Bloch operator as in the R-matrix theory, but turns out to be less practical for numerical applications. Hence, using the FEDVR-based formalism, the numerical performance is tested by computing double-ionization dynamics of atomic beryllium in intense light fields. To achieve high accuracy,M should be set large to take into account the strong many-electron correlation around the nucleus. On the other hand,M can be set much smaller thanM for capturing the weaker correlation between the two outgoing photoelectrons. As a result, compared with more accurate multiconfigurational TD Hartree-Fock (MCTDHF) method, the TD-RASSCF-SP method may achieve comparable accuracy in the description of the double-ionization dynamics. There are, however, difficulties related to the stiffness of the equations of motion of the TD-RASSCF-SP method, which makes the required time step for this method smaller than the one needed for the MCTDHF approach.

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Population trapping in bound states during IR-assisted ultrafast photoionization ofNe+

Cited by 10 publications

References 27 publications

Harmonic generation by noble-gas atoms in the near-IR regime usingab initiotime-dependentR-matrix theory

Harmonic generation by noble-gas atoms in the near-IR regime usingab initiotime-dependentR-matrix theory

Cooper minimum in singly ionized and neutral argon

Time-dependent restricted-active-space self-consistent-field theory with space partition

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