Autoionizing states of atomic boron

Argenti, Luca; Moccia, R.

doi:10.1103/physreva.93.042503

Cited by 10 publications

(3 citation statements)

References 115 publications

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“…In the present work, the single-ionization scattering states of helium below the double ionization threshold are computed using the B-spline K-matrix method [61,62]. The K-matrix method is an L 2 realization of a configurationinteraction calculation in the continuum that has been successfully applied to a number of problems in atomic and molecular physics [42,53,[63][64][65][66][67][68][69][70]. This method will be briefly summarized below in the case of helium, for scattering states with total symmetry Γ, which we will not explicitly indicate, for brevity.…”

Section: Theorymentioning

confidence: 99%

Attosecond Transient Absorption Spectroscopy of doubly-excited states in helium

Argenti

Ott

Pfeifer

et al. 2014

J. Phys.: Conf. Ser.

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Strong-field manipulation of autoionizing states is a crucial aspect of electronic quantum control. Recent measurements of the attosecond transient absorption spectrum of helium dressed by a fewcycle visible pulse [Ott et al., arXiv:1205.0519[physics.atom-ph] ] provide evidence of novel ultrafast resonant phenomena, namely, two-photon Rabi oscillations between doubly-excited states and the inversion of Fano profiles. Here we present the results of accurate ab-initio calculations that agree with these observations and in addition predict that (i) inversion of Fano profiles is actually periodic in the coupling laser intensity and (ii) the supposedly dark 2p 2 1 S state also appears in the spectrum. Closer inspection of the experimental data confirms the latter prediction.

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Section: Theorymentioning

confidence: 99%

Attosecond Transient Absorption Spectroscopy of doubly-excited states in helium

Argenti

Ott

Pfeifer

et al. 2014

J. Phys.: Conf. Ser.

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“…The resulting MCHF localized active orbitals are used to form a basis of localized configurations for the neutral system (localized channel). A finite set of ionic states are augmented by a set of diffuse spherical orbitals, complementary to the MCHF active orbitals, given by products of spherical harmonics and radial B-splines (partial-wave channels) [31]. The set of partial-wave channels together with the localized channel form a so-called close-coupling configuration space that is able to accurately reproduce the asymptotic multi-channel character as well as the short-range correlated character of bound states, Rydberg states, and the resonant electronic continuum, within a given quantization box, which in the present work has a radius R box = 500 Bohr-radii.…”

Section: Theoretical Methodsmentioning

confidence: 99%

Multi-polariton control in attosecond transient absorption of autoionizing states

Yanez-Pagans,

Cariker,

Shaikh

et al. 2022

Preprint

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Tunable attosecond transient absorption spectroscopy is an ideal tool for studying and manipulating autoionization dynamics in the continuum. We investigate near-resonant two-photon couplings between the bright 3s −1 4p and dark 3s −1 4f autoionizing states of argon that lead to Autler-Townes like interactions, forming entangled light-matter states, or polaritons. We observe that one-photon couplings with intermediate dark states play an important role in this interaction, leading to the formation of multiple polaritonic branches whose energies exhibit avoided crossings as a function of the dressing-laser frequency. Our experimental measurements and theoretical essential-state simulations show good agreement and reveal how the delay, frequency, and intensity of the dressing pulse govern the properties of autoionizing polariton multiplets. These results demonstrate new pathways for quantum control of autoionizing states with optical fields.

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“…The ionic states of the atom are determined, within the electrostatic approximation, by optimizing the energy of the 3s −1 and 3p −1 states with a Multi-Configuration Hartree-Fock calculation, performed with the ATSP2K atomic-structure package [34]. The full atomic wavefunction is expressed in a close-coupling basis obtained by augmenting the ionic states with a set of radial B-spline and spherical harmonics for the residual electron [35]. To compute the state of the atom Ψ(t) in the presence of the external fields, we solve the timedependent Schroedinger equation (TDSE) in the close coupling basis, with a unitary split-exponential propagator and within the dipole approximation in velocity gauge.…”

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confidence: 99%

Autoionizing Polaritons in Attosecond Atomic Ionization

Harkema,

Cariker,

Lindroth

et al. 2021

Preprint

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Light-induced states are commonly observed in the photoionization spectra of laser-dressed atoms. The properties of autoionizing polaritons, entangled states of light and Auger resonances, however, are largely unexplored. We employ attosecond transient-absorption spectroscopy to study the evolution of autoionizing states in argon, dressed by a tunable femtosecond laser pulse. The avoided crossings between the 3s −1 4p and several light-induced states indicates the formation of polariton multiplets. We measure a controllable stabilization of the polaritons against ionization, in excellent agreement with ab initio theory. Using an extension of the Jaynes-Cummings model to autoionizing states, we show that this stabilization is due to the destructive interference between the Auger decay and the radiative ionization of the polaritonic components. These results give new insights into the optical control of electronic structure in the continuum, and unlock the door to applications of autoionizing polaritons in poly-electronic systems.

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Autoionizing states of atomic boron

Cited by 10 publications

References 115 publications

Attosecond Transient Absorption Spectroscopy of doubly-excited states in helium

Attosecond Transient Absorption Spectroscopy of doubly-excited states in helium

Multi-polariton control in attosecond transient absorption of autoionizing states

Autoionizing Polaritons in Attosecond Atomic Ionization

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