Threshold behavior in single-photon double ionization of atomic oxygen

He, Z. X.; Moberg, R.; Samson, James A. R.

doi:10.1103/physreva.52.4595

Cited by 9 publications

(9 citation statements)

References 32 publications

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“…The measured Wannier exponent was in agreement with the theoretical value of 1.056 assuming a flat energy distribution between the ejected electrons. So far, the only DPI experiments that tested the Wannier power law on atoms by measuring ions was performed on He [30] and atomic oxygen [31]. They confirmed the theoretical Wannier exponent and determined the range of validity as 2 eV above threshold.…”

mentioning

confidence: 74%

Oscillations in the Double-Photoionization Cross Section of Li near Threshold

2002

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The threshold region of the double-photoionization cross section of lithium was investigated using monochromatized synchrotron radiation and ion time-of-flight spectrometry. While the overall energy dependence can be described by the Wannier power law, we found oscillations in the cross section which are in good agreement with a modulated threshold law as proposed by Temkin [Phys. Rev. Lett. 49, 365 (1982)]]. This behavior may be due to the unequal binding energies of the electrons involved in the double-photoionization process.

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confidence: 74%

Oscillations in the Double-Photoionization Cross Section of Li near Threshold

2002

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“…Recently, there has been great interest in the study of atomic oxygen [1][2][3][4][5][6][7][8][9][10]. The majority of experimental work concentrated on measuring the photoelectrons and Auger electrons emitted during the photoionization process.…”

mentioning

confidence: 99%

“…The photon flux was monitored with a silicon photodiode, the efficiency of which remained essentially constant over the energy range studied; therefore, each scan represents a relative cross section. Normally the molecular contribution to the spectrum is removed by subtraction of a microwave discharge off spectrum, which has been normalized to the 530.5 eV molecular peak [1][2][3][6][7][8][9][10]. This results in several residual peaks created by the subtraction process.…”

mentioning

confidence: 99%

The K-shell Auger decay of atomic oxygen

Stolte

Lü

Samson

et al. 1997

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

142

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Relative photoionization cross sections for O + and O 2+ produced by the Auger decay of a 1s hole in atomic oxygen were measured by using synchrotron radiation between 525 and 553 eV. Energies and quantum defects of the members of the two Rydberg series converging to [1s]2s 2 2p 4 ( 4 P) and [1s]2s 2 2p 4 ( 2 P) ionization thresholds were determined. In addition, the 2 P and 4 P ionization thresholds were calculated from the two Rydberg series. The 182 meV resolution of the monochromator allowed a detailed study over both thresholds revealing evidence for post-collision interaction and allowing a comparison of the ionization continuum above both 2 P and 4 P thresholds with that of the ionization continuum above the Ar L 2-3 edges. This comparison indicates that the lifetimes of the Ar(2p) and O(1s) hole states are approximately the same.

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“…Photo-double ionization intensities ͑calculated with BCONT͒ for the highest energy bound vibrational level of the 2 1 ⌺ ϩ electronic state of SO 2ϩ and the two lowest lying continuum resonances due to that electronic state. oxygen is 48.739 eV, 45 meaning that all structure due to O 2ϩ would lie in an energy range above all structure due to SO 2ϩ simulated in this work͒. The photo-double ionization spectrum of the main contaminant, SO 2 , is less well known, but is the subject of a recent combined theoretical and experimental study 15 in which the previous literature is reviewed.…”

Section: Discussionmentioning

confidence: 97%

Theoretical investigation of the SO2+ dication and the photo-double ionization spectrum of SO

Houria

Lakhdar

Hochlaf³

et al. 2005

The Journal of Chemical Physics

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Highly correlated ab initio methods were used in order to generate the potential energy curves of the electronic states of the SO(2+) dication and of the electronic ground state of the neutral SO molecule. These curves were used to predict the spectroscopic properties of this dication and to perform forward calculations of the double photoionization spectrum of SO. In light of spin-orbit calculations, the metastability of this doubly charged ion is discussed: for instance, the rovibrational levels of the X (1)Sigma(+) and A (3)Sigma(+) states are found to present relatively long lifetimes. In contrast, the other electronic excited states should predissociate to form S(+) and O(+) in their electronic ground states. The simulated spectrum shows structures due to transitions between the v=0 vibrational level of SO (X (3)Sigma(-)) and the vibrational levels below the barrier maximum of 11 of the calculated electronic states. The 2 (1)Sigma(+) electronic state of SO(2+) received further treatment: in addition to vibrational bands due to the below barrier energy levels of this electronic state, at least nine continuum resonances were predicted which are responsible for the special shape of the spectrum in this energy region. This work is predictive in nature and should stimulate future experimental investigations dealing with this dication.

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Threshold behavior in single-photon double ionization of atomic oxygen

Cited by 9 publications

References 32 publications

Oscillations in the Double-Photoionization Cross Section of Li near Threshold

Oscillations in the Double-Photoionization Cross Section of Li near Threshold

The K-shell Auger decay of atomic oxygen

Theoretical investigation of the SO2+ dication and the photo-double ionization spectrum of SO

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