Single and double photoionization of Be and Mg

Pindzola, M. S.; Ballance, C. P.; Abdel‐Naby, Sh. A.; Robicheaux, F.; Armstrong, Gregory; Colgan, J.

doi:10.1088/0953-4075/46/3/035201

Cited by 22 publications

(25 citation statements)

References 27 publications

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“…This approach provides a reasonable treatment of the interaction of the outgoing electrons with the multielectron core, and has been employed recently to obtain total cross sections for electron-impact ionization of Mg and Al + [24] and photoionization of Be and Mg [25].…”

Section: A Time-dependent Close-coupling Methodsmentioning

confidence: 99%

“…This time propagation scheme has previously been used in TDCC studies of the double photoionization of Be and Mg [25] and in the electron-impact ionization of H 2 [7] and H 2 + [26]. When used in conjunction with a variable mesh finite-difference grid, the implicit propagator has a number of key advantages over an explicit propagator.…”

Section: A Time-dependent Close-coupling Methodsmentioning

confidence: 99%

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Angular distributions for the electron-impact single ionization of sodium and magnesium

2013

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We present angular distributions for the electron-impact single ionization of sodium and magnesium at intermediate incident electron energies. The results are obtained from a full-dimensionality solution of the two-active-electron time-dependent Schrödinger equation using the time-dependent close-coupling method. We compare calculated angular distributions with existing measurements. We find good overall agreement with measurements over a range of incident electron energies in both cases. We also calculate angular distributions for ejection configurations in which no measurements are currently available.

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Section: A Time-dependent Close-coupling Methodsmentioning

confidence: 99%

Section: A Time-dependent Close-coupling Methodsmentioning

confidence: 99%

Angular distributions for the electron-impact single ionization of sodium and magnesium

2013

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“…(11). In fact, this expression would become singular at the energies that are resonant with each ionization threshold of the neutral in the limit of an infinitely long pulse.…”

Section: Generalized Differential Cross Sectionsmentioning

confidence: 99%

“…Very few reliable ab initio theoretical investigations are available on one-photon double ionization of multielectron targets like Be or Mg [10][11][12], and they are even scarcer for the two-photon absorption process [13]. From an experimental point of view, the two-photon double ionization of atoms brings the challenge of measuring a minor contribution with respect to the also present single ionization channel.…”

Section: Introductionmentioning

confidence: 99%

Two-photon double ionization of atomic beryllium with ultrashort laser pulses

et al. 2015

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We investigate the two-photon double ionization of beryllium atom induced by ultrashort pulses. We use a time-dependent formalism to evaluate the ionization amplitudes and generalized cross sections for the ejection of the 2s 2 valence shell electrons in the presence of a fully occupied 1s 2 frozen core shell. The relative contributions of the two-photon direct and sequential process are systematically explored by varying both pulse duration and central frequency. The energy and angular differential ionization yields reveal the signatures of both mechanisms, as well as the role of electron correlation in both the single and double ionization continua. In contrast with previous results on the helium atom, the presence of an electronic core strongly affects the final state leading to back-to-back electron emission even in the a priori less correlated two-photon sequential mechanism. In particular, a dominant pathway via excitation ionization through the Be + (2p) determines the profiles and pulse-duration dependencies of the energy and angle differential yields.

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“…Both experiment and theory have investigated the single and double photoionization of two valence electrons atoms beginning with He to other few alkalineearth-metal atoms like Be or Mg [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. In the two-photon double ionization process, multiple pathways can be open for the electrons to reach the double continuum.…”

Section: Introductionmentioning

confidence: 99%

Direct and sequential ejection of the two valence electrons of beryllium by ultrashort laser pulses with photon energies below 18.2 eV

2017

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We investigate the two-photon double ionization of a beryllium atom by intense ultrashort laser pulses. We apply a nonperturbative approach to solve the time-dependent Schrödinger equation. We treat the atom as a two-active-electron system with two outer electrons in the field of a frozen core that includes the nucleus and the electrons of the 1s2 inner shell. We trigger the ionization with photon energies lower than the second ionization potential Ip(Be+(2s)) = 18.2 eV of the atom so that the 2s2 valence shell electrons can be directly ejected in the double continuum or sequentially ejected via excitation ionization through the Be+(2p) ion. We investigate, for various photon energies, the contribution of each of the direct and sequential processes to the ionization dynamic.

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Single and double photoionization of Be and Mg

Cited by 22 publications

References 27 publications

Angular distributions for the electron-impact single ionization of sodium and magnesium

Angular distributions for the electron-impact single ionization of sodium and magnesium

Two-photon double ionization of atomic beryllium with ultrashort laser pulses

Direct and sequential ejection of the two valence electrons of beryllium by ultrashort laser pulses with photon energies below 18.2 eV

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