Decay Paths of Interfering Two-Electron Excitations in Helium

Menzel, A.; Frigo, Sean P.; Whitfield, S. B.; Caldwell, C. D.; Krause, Manfred O.; Tang, Jianjun; Shimamura, Isao

doi:10.1103/physrevlett.75.1479

Cited by 47 publications

(51 citation statements)

References 24 publications

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“…[9]. The error bars in the cross sections were estimated to be ±2% for 2 5 , ±10% for 3 5 , and ±15% for 4 5 .…”

Section: B Experimental Results and Data Analysismentioning

confidence: 87%

“…The filled data points are the present experimental results, with the solid curves through the data points representing the fit results. The dashed curves represent the data by Menzel et al [9] and the dashed-dotted curves the results of the R-matrix calculations convoluted with a Gaussian of 6 meV width (FWHM) to simulate finite experimental resolution.…”

Section: B Experimental Results and Data Analysismentioning

confidence: 99%

“…The PCSs below the ionization threshold I 6 , with the perturbers 7 , 5 8 and 7 , 5 9 , and below the ionization threshold I 7 , with the perturber 8 , 6 10 , are shown in Figs. 3 and 4, respectively.…”

Section: B Experimental Results and Data Analysismentioning

confidence: 99%

“…Menzel et al reported on measurements of partial cross sections up to the ionization threshold I 5 employing two spherical-sector-plate electrostatic analyzers [9,10] and discussed the observed general patterns in n . Here, n describes the PCS for the channel leading to He + , with the single electron in a state with principal quantum number n. Very recently, Schneider et al [11] and van der Hart et al [12] confirmed in their calculations these regularities in n up to the ionization threshold I 9 . The similarities in the PCSs for the energy region with a small number of pertubers, also called "general patterns," can be well understood with the so-called propensity rules based on the molecular adiabatic approximation [11].…”

Section: Introductionmentioning

confidence: 99%

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Partial cross sections of doubly excited helium below the ionization thresholdI7

et al. 2004

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Partial photoionization cross sections (PCSs), n , leading to final ionic states of helium, He + ͑n͒, were measured at BESSY II in the region of doubly excited helium up to the ionization threshold I 7 of He + . The experiments were performed with a time-of-flight (TOF) electron spectrometer and high photon resolution, ⌬E Х 6 meV. The results of these measurements are a most critical assessment of the decay dynamics of double-excitation resonances and agree well with those of recent eigenchannel R-matrix calculations. They also confirm the propensity rules set up for the autoionization of doubly excitated states. The mirroring behavior in the PCSs predicted recently by Liu and Starace is only partially observed. By discussing the formulas given by these authors in a more general context, the specific behavior of the PCSs of helium with respect to mirroring can be understood. The mirroring compensation properties between the "fractional partial cross sections" ␥ P = P / T and ␥ Q = Q / T , with T = P + Q , are introduced and discussed.

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“…[9]. The error bars in the cross sections were estimated to be ±2% for 2 5 , ±10% for 3 5 , and ±15% for 4 5 .…”

Section: B Experimental Results and Data Analysismentioning

confidence: 87%

Section: B Experimental Results and Data Analysismentioning

confidence: 99%

Section: B Experimental Results and Data Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Partial cross sections of doubly excited helium below the ionization thresholdI7

et al. 2004

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“…data [15] on an absolute scale is in general good. Interestingly the cross section in acceleration gauge (dashed) is higher than in velocity gauge (solid) and higher than the experiment for the partial cross section N ′ = 1.…”

Section: B Typical Cross Sectionsmentioning

confidence: 89%

Intermanifold similarities in partial photoionization cross sections of helium

2002

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Using the eigenchannel R-matrix method we calculate partial photoionization cross sections from the ground state of the helium atom for incident photon energies up to the N = 9 manifold. The wide energy range covered by our calculations permits a thorough investigation of general patterns in the cross sections which were first discussed by Menzel and co-workers [Phys. Rev. A 54, 2080]. The existence of these patterns can easily be understood in terms of propensity rules for autoionization. As the photon energy is increased the regular patterns are locally interrupted by perturber states until they fade out indicating the progressive break-down of the propensity rules and the underlying approximate quantum numbers. We demonstrate that the destructive influence of isolated perturbers can be compensated with an energy-dependent quantum defect.

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He photoionization: β N and σ N below N = 5 and 6 thresholds

Argenti

Moccia

2007

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Decay Paths of Interfering Two-Electron Excitations in Helium

Cited by 47 publications

References 24 publications

Partial cross sections of doubly excited helium below the ionization thresholdI7

Partial cross sections of doubly excited helium below the ionization thresholdI7

Intermanifold similarities in partial photoionization cross sections of helium

He photoionization: β N and σ N below N = 5 and 6 thresholds

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