Complete photofragmentation of the lithium atom

Malcherek, A W; Rost, Jan M.; Briggs, J S

doi:10.1103/physreva.55.r3979

Cited by 24 publications

(14 citation statements)

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“…As in the experiment, statistics of the contribution is an important factor and therefore, more integrated observables are easier to determine compared to highly differential ones. Interestingly the classical domain of validity is complementary to that of approximate quantum calculations, e.g., with the so called 6C wavefunction [22] where the fully differential cross section is calculated and more integrated observables require numerically expensive integrations.…”

Section: Experimentally Accessible Observables: Total Triple Photoionmentioning

confidence: 99%

The Coulomb four-body problem in a classical framework: triple photoionization of lithium

Emmanouilidou¹,

Rost²

2006

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

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Abstract. Formulating a quasiclassical approach we determine the cross section for the complete four-body break-up of the lithium ground state following single photon absorption from threshold up to 220 eV excess energy. In addition, we develop a new classification scheme for three-electron ionizing trajectories in terms of electron-electron collisions, thereby identifying two main ionization paths which the three electrons in the ground state of lithium follow to escape to the continuum. The dominant escape paths manifest themselves in a characteristic "T-shape" break-up pattern of the three electrons which implies observable structures in the electronic angular correlation probability. This break-up pattern prevails for excess energies so low that the Wannier threshold law σ ∝ E α describes already the triple ionization cross section, whose predicted value α = 2.16 we can confirm quantitatively.

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Section: Experimentally Accessible Observables: Total Triple Photoionmentioning

confidence: 99%

The Coulomb four-body problem in a classical framework: triple photoionization of lithium

Emmanouilidou¹,

Rost²

2006

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

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“…The use of ultracold lithium offers some advantages, namely, elimination of contamination by dimers, reduction of the background due to the localized target image, and the possible use of multiparticle momentum-imaging techniques to elucidate dynamical electron correlation [17]. The reduction in background, a factor of 10 relative to the atomic beam [18], is essential for observation of Li 3 .…”

mentioning

confidence: 99%

“…Finally, the angular correlation patterns for three-electron ejection from lithium [17] were calculated in anticipation of experiments.…”

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confidence: 99%

Triple Ionization of Lithium by Electron Impact

et al. 2003

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Ejection of the three electrons from lithium in a single electron collision has been observed for the first time. Triply charged lithium was observed in an ion time-of-flight spectrum following electron impact on a sample of ultracold, trapped lithium. The higher signal/background afforded by the trap environment made the observation of Li3+ possible. We measured the ratios of triple-to-double and double-to-single ionization at an impact energy of 1000 eV. The 3+/2+ ratio is approximately 0.001, a value 2 orders of magnitude lower than semiempirical predictions. We present a simple method that uses photoionization data combined with sum-rule analysis to predict the asymptotic charge-state ratios. The sum-rule predictions compare reasonably with experiment and shake calculations, but disagree sharply with the semiempirical estimates.

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“…Some early studies explored the selection rules for three continuum electrons [20,21], and used approximate 6C wave functions to provide some qualitative examples. The most relevant selection rule discussed for Li photofragmentation was that the pentuple differential cross section must be zero if all electrons are emitted in a plane perpendicular to the polarization axis, for states with M ¼ 0 and odd parity.…”

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confidence: 99%

Angular Distributions for the Complete Photofragmentation of the Li Atom

Colgan

Pindzola

2012

Phys. Rev. Lett.

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We explore the complete breakup of the Li atom after absorption of a single photon, the purest example of the so-called four-body Coulomb problem. The resulting strongly correlated three-electron continuum is investigated by calculating the angular distributions of the ionized electrons using advanced close-coupling techniques. We find that the distributions are dominated by the Coulomb interactions between the electrons, that multiple break-up processes can be identified, and that the complex dynamics of the fragmentation process are evident for most scattering geometries.

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Complete photofragmentation of the lithium atom

Cited by 24 publications

References 0 publications

The Coulomb four-body problem in a classical framework: triple photoionization of lithium

The Coulomb four-body problem in a classical framework: triple photoionization of lithium

Triple Ionization of Lithium by Electron Impact

Angular Distributions for the Complete Photofragmentation of the Li Atom

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