Lamb Shift Excitation Energy in the Ground State of the Helium Atom

Salpeter, E. E.; Zaidi, M. H.

doi:10.1103/physrev.125.248

Cited by 99 publications

(31 citation statements)

References 15 publications

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“…Calculations of photoionization with excitation 9 have been reported previously for He 10 and Ne. 11 However, the satellite structures in Ar, Kr, and Xe, which are much stronger, have a different origin.…”

Section: Influence Of the Energy Of The Incident Photon On Satellite mentioning

confidence: 99%

Influence of the Energy of the Incident Photon on Satellite Intensities in Photoelectron Spectra of the Rare Gases

Smid

Hansen

1984

Phys. Rev. Lett.

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Section: Influence Of the Energy Of The Incident Photon On Satellite mentioning

confidence: 99%

Influence of the Energy of the Incident Photon on Satellite Intensities in Photoelectron Spectra of the Rare Gases

Smid

Hansen

1984

Phys. Rev. Lett.

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“…This is an interesting problem which appears to be soluble for two-electron atomic resonances, 33,34 at least in a few simple cases. 35 In our case detailed knowledge of energy bands as well as a sophisticated treatment of hyperbolic energy surfaces would be required to determine these parameters. 36 We have preferred to regard these parameters as phenomenological quantities, and focus our attention on the line shape, particularly of antiresonances.…”

Section: Discussionmentioning

confidence: 99%

“…Firstly the phase shifts AQ, An/, are complex. Secondly, by a suitable choice of the variables in(35) \p n -~(E) may be made to vanish, so that the noncoherence of the scattering states \pn+(E),\f/ n -(E) does not destroy completely the antiresonances of the peaks in question. It will be seen that the line shapes for the A 551 mixed channel case are significantly different from those of the single-channel or independent-channels case.…”

mentioning

confidence: 99%

Line Shapes and Configuration Interaction of Exciton Resonances

Jain

1965

Phys. Rev.

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To describe optical absorption in insulators and semiconductors the random-phase-approximation formulation of the dielectric response is extended to include resonant as well as scattering states. Characteristic interference effects are obtained within this generalized random-phase approximation for exciton resonances both above and below the direct absorption threshold, and these give rise to intrinsic asymmetries in the line shapes. The absorption is described in terms of a collective phase shift A and the electron-hole scattering channels Q,u>. In the presence of Raman (interband) scattering the collective phase shift becomes complex. As an example the ultraviolet absorption spectrum of solid xenon, as measured by Baldini, is analyzed. Theoretical line shapes are in good agreement with the experimental ones. Configuration interaction between families of resonances is invoked to explain the anomalies in the binding energies and oscillator strengths of r(J) and Z,(f) excitons in solid xenon.

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“…The accuracy of the calculations depends on the choice of wavefunction. Dalgarno and Stewart (1960) and Salpeter and Zaidi (1962) have calculated the oscillator strength for one particular transition involving simultaneous photoexcitation and photoionization of helium, namely Is2 -+ (2S,£p)lp, using an 18-parameter Hylleraas wavefunction for the bound state of helium and the Hartree approximation for the free state. Brown (1970) has evaluated the single photoionization cross section using the Eckart wavefunction, and his results for energies greater than threshold agree well with those obtained by Salpeter and Zaidi, who used a much more accurate ground state representation.…”

Section: Discussionmentioning

confidence: 99%

Raman Processes in the Helium Atom in Intense Fields

Thareja¹,

Mohan²,

Nayak³

et al. 1975

Aust. J. Phys.

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Using the hydrogenic model for the helium atom, the amplitude of transition from states He(ls) to He(ls, nl) by absorption of N photons of an intense field together with the emission of one Raman photon is evaluated. From the general expression for the transition amplitude, the particular case of transition from He(ls) to He(ls, 2p) is considered. The 'reduced' transition amplitude is plotted against the number of photons N involved and against the intensity parameter y st;parately. It is found that the s wave contributes maximaly to the transition amplitude. An important feature of the calculations is the appearance of nonlinear behaviour at high intensity. The dominance of higher order processes over lower ones at high intensity is also found.

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Lamb Shift Excitation Energy in the Ground State of the Helium Atom

Cited by 99 publications

References 15 publications

Influence of the Energy of the Incident Photon on Satellite Intensities in Photoelectron Spectra of the Rare Gases

Influence of the Energy of the Incident Photon on Satellite Intensities in Photoelectron Spectra of the Rare Gases

Line Shapes and Configuration Interaction of Exciton Resonances

Raman Processes in the Helium Atom in Intense Fields

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