Theory of multiphoton single and double ionization of two-electron atomic systems driven by short-wavelength electric fields: An<i>ab initio</i>treatment

Foumouo, Emmanuel; Kamta, G. Lagmago; Edah, Gaston; Piraux, Bernard

doi:10.1103/physreva.74.063409

Cited by 166 publications

(219 citation statements)

References 82 publications

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“…The results are presented in Figure 4. The results calculated in both the length and velocity gauges are nearly identical and agree well with the results calculated by wavepacket propagation [44], by time-dependent close coulpling [43]and by convergent close coupling in the velocity gauge [42] (circles, squares and diamonds in Fig. 4, respectively).…”

Section: B Total Double Photoionization Cross Sectionsupporting

confidence: 77%

“…The significance of the high partial-wave components confirms the importance of electron correlation in describing the double photoionization process. [44]. Squares correspond to results reported by Pindzola and Robicheaux calculated using TDCC methods [43].…”

Section: A Convergence Testsmentioning

confidence: 99%

“…Since then, the problem has been treated by model calculations [38,39], variationally [40], R-matrix methods [41], convergent close-coupling [42], time dependent close-coupling [43], and most recently by wavepacket propagation [44]. The application of these various methods have yielded absolute total cross sections for DPI of H − as well as ratios of single ionization to double ioniza-tion.…”

Section: Introductionmentioning

confidence: 99%

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Single and triple differential cross sections for double photoionization ofH−

et al. 2007

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The hydride anion H − would not be bound in the absence of electron correlation. Electron correlation drives the double photoionization process and, thus should impact double photoionization results most strongly for H − . We present fully differential cross sections for the three-body breakup of H − by single photon absorption. The absolute triple-differential and single-differential cross sections were yielded by ab initio calculations making use of exterior complex scaling within a discrete variable representation partial wave basis. Results calculated at photon energies of 18eV and 30eV are compared with reported cross sections for helium calculated at 20eV above the double ionization threshold. These comparisons show a clear signature of initial state correlation that differentiate the He and H − cases.

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Section: B Total Double Photoionization Cross Sectionsupporting

confidence: 77%

Section: A Convergence Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Single and triple differential cross sections for double photoionization ofH−

et al. 2007

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“…Provided one of the electrons is emitted perpendicular to the laser polarization direction, it is found that the angular distribution of the other electron is characterized by three lobes. The results are similar to those recently reported for the corresponding process in the hydrogen negative ion [R. The problem of direct (nonsequential) two-photon double ionization of helium has been studied extensively in recent years, as exemplified by numerous theoretical [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] and experimental [19][20][21][22][23][24] works. This breakup process is fundamental in the sense that it is one of the simplest processes in nature where electron correlations are exhibited, manifested by a rather complex interplay between the electrons.…”

supporting

confidence: 73%

“…The problem of direct (nonsequential) two-photon double ionization of helium has been studied extensively in recent years, as exemplified by numerous theoretical [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] and experimental [19][20][21][22][23][24] works. This breakup process is fundamental in the sense that it is one of the simplest processes in nature where electron correlations are exhibited, manifested by a rather complex interplay between the electrons.…”

mentioning

confidence: 99%

Two-photon double ionization of helium by attosecond laser pulses: Evidence of highly correlated electron motion

2012

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We apply a recently developed ab initio numerical framework to investigate the angular distributions of the emitted electrons in the immediate proximity of the threshold for the two-photon double ionization of helium. Provided one of the electrons is emitted perpendicular to the laser polarization direction, it is found that the angular distribution of the other electron is characterized by three lobes. The results are similar to those recently reported for the corresponding process in the hydrogen negative ion [R. The problem of direct (nonsequential) two-photon double ionization of helium has been studied extensively in recent years, as exemplified by numerous theoretical [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] and experimental [19][20][21][22][23][24] works. This breakup process is fundamental in the sense that it is one of the simplest processes in nature where electron correlations are exhibited, manifested by a rather complex interplay between the electrons. As such, a complete understanding of it will pave the way for further investigations of the role of correlations in few-photon and multiphoton multiple ionization processes in atoms and molecules.In the present Brief Report, we investigate the direct two-photon double ionization process of helium in the near vicinity of the lower threshold (i.e., for 40 eV photons), and with particular emphasis on the direction of ejection of the photo-electrons. In a recent work [25], it was found that the corresponding process in H − is characterized by a strong backward-forward asymmetry in the sense that if one electron is emitted perpendicular to the (linear) laser polarization direction then the other electron is emitted most preferably in the opposite direction, forming three characteristic lobes in the angular distribution. Similar features have also been observed theoretically in H 2 [26][27][28].Solving the time-dependent Schrödinger equation numerically for helium [14], the conditional angular distribution is obtained for both short (500 and 1000 as) and long (4 fs) linearly polarized laser pulses. We examine the case where one of the electrons is emitted perpendicular to the laser polarization direction, and integrate over the energy of both electrons. It is found that the direction of emission of the other electron is characterized by three lobes, concordant with the observations in H − [25]. Furthermore, with increasing pulse duration, the lobe pointing in the backward direction, representing electrons being emitted back-to-back, becomes relatively more important. The "backward" lobe is most distinct at lower photon energies, and already at a photon energy of 42 eV it loses its significance [11]. We therefore anticipate that the presence of the structure at lower photon energies is * sigurd.askeland@ift.uib.no † morten.forre@ift.uib.no a signature of a competing double ionization mechanism that becomes suppressed at higher photon energies.Figure 1 depicts our results for the angular distributions in the double ionization process. I...

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Strong‐Field Interactions at EUV and X‐Ray Wavelengths

Rudenko

2014

Attosecond and XUV Physics

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Theory of multiphoton single and double ionization of two-electron atomic systems driven by short-wavelength electric fields: Anab initiotreatment

Cited by 166 publications

References 82 publications

Single and triple differential cross sections for double photoionization ofH−

Single and triple differential cross sections for double photoionization ofH−

Two-photon double ionization of helium by attosecond laser pulses: Evidence of highly correlated electron motion

Strong‐Field Interactions at EUV and X‐Ray Wavelengths

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