Photo–double-ionization of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>n</mml:mi><mml:mi>s</mml:mi></mml:mrow></mml:math>shell of rare gases

Argenti, Luca; Bolognesi, P.; Colle, Renato; Feyer, Vitaliy; Avaldi, L.

doi:10.1103/physreva.79.063408

Cited by 1 publication

(4 citation statements)

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“…The feasibility of such a process is documented in Ref. [1]. However, now, instead of the scattering two-electron continuum above the threshold labeled by the Ne 2+ 1s 2 2p 6 1 S configuration, we focus on the part of the spectrum below this threshold and, specifically, on the possibility of establishing the existence of a few Ne DESs of 1 P o symmetry that are obviously unstable (resonance states) and have, possibly, properties of regularity as a function of excitation energy toward the Ne 2+ 1s 2 2p 6 1 S threshold.…”

Section: Statement Of the Problemmentioning

confidence: 99%

“…Specifically, we chose to examine the possibility of computing approximate solutions of the Schrödinger equation that represent DESs of 1 P o symmetry that are below the Ne 2+ 1s 2 2p 6 1 S threshold and are embedded inside the two-electron continua of the Ne 2+ 1s 2 2s 2 2p 4 3 P , 1 D, 1 S and 1s 2 2s2p 5 3 P o , 1 P o thresholds in addition to oneelectron continua. The understanding and proper use of these solutions have allowed the computation of energies and their description by an effective hydrogenic formula leading to the Ne 2+ 1s 2 2p 6 1 S TEIT [Eq.…”

Section: Synopsis and Conclusionmentioning

confidence: 99%

“…A recent experimental example of two-electron excitation from inner subshells is provided by the publication of Argenti et al [1]. These authors presented results of measurements of the triple differential cross sections (TDCSs) for the photodouble ionization of He, Ne, Ar, and Xe from the 1s 2 , 2s 2 , 3s 2 , and 5s 2 subshells, respectively, at energies of 20 eV above threshold, and successfully demonstrated an approach to the parametrization of the TDCSs.…”

Section: Introductionmentioning

confidence: 99%

“…[1] contribute to the quest for quantitative knowledge and insight * ykomn@eie.gr, thmerc@eie.gr, caan@eie.gr for processes, spectra, and phenomena resulting from the highenergy double-electron excitation of rare gases larger than He, which is the system that is normally examined theoretically for studies of double-electron excitation. Needless to add, such information is even more difficult to obtain quantitatively for N-electron states whose zero-order description involves open subshells.…”

Section: Introductionmentioning

confidence: 99%

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Regular series of doubly excited states inside two-electron continua: Application to2s2-hole states in neon above the Ne2+

2011

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We report results of many-electron calculations that predict the presence of a regular series of autoionizing doubly excited states (DESs) of 1 P o symmetry embedded inside one-as well as two-electron continua of neon, in the range of excitation 105.9-121.9 eV above the ground state. The limit of 121.9 eV represents the two-electron ionization threshold (TEIT) labeled by Ne 2+ 1s 2 2p 6 1 S. The wave functions of these unstable states and their properties are computed according to the theoretical framework, which is explained and justified in the text. Their formal structure is (ψ core ) 1 S ⊗ ( r 1 , r 2 ) 1 P o , where both ψ core and ( r 1 , r 2 ) are correlated wave functions, the latter being represented reasonably accurately by a self-consistently obtained superposition of nsnp and np(n + 1)d configurations n = 3-7. By fitting the calculated lowest energies at each value of n, (five states), an effective hydrogenic formula is obtained, which gives the whole energy spectrum up to the TEIT. The autoionization widths are small and decrease with excitation energy. Oscillator strengths for the excitation of these narrow resonance states by absorption of one photon are also small. Because of their electronic structure, these states are compared to 1 P o DESs in He, which were found in the 1980s to constitute a regular ladder with wave-function characteristics that tend to those of the so-called Wannier state at threshold. In the present case, the presence of the core and the concomitant interactions do not permit the emergence of such geometrical features.

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Section: Statement Of the Problemmentioning

confidence: 99%

Section: Synopsis and Conclusionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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