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Valence double ionization of at photon energies below and above the molecular double ionization threshold
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Image of FIG. 1.
FIG. 1.

Complete two-dimensional electron–electron coincidence maps of recorded at (a) and (b) at photon energies.

Image of FIG. 2.
FIG. 2.

Upper panel: Atomic autoionization spectrum of molecular oxygen measured at photon energy. An assignment of the observed transitions can be made with reasonable certainty according to Refs. 22–29 and is listed in Table I. Lower panel: Some Rydberg series decaying to are marked for orientation.

Image of FIG. 3.
FIG. 3.

Upper panel: Precursor electron spectra associated with the atomic autoionization lines “A1–A6” (cf. Fig. 2) measured at . Lower panel: Intensity sum of the precursor electron spectra associated with “A1–A6.”

Image of FIG. 4.
FIG. 4.

Isometric perspective of the coincidence maps recorded at (a) and (b) photon energies, where the intensity is shown as a function of the binding energy of the electrons (into the page), and the kinetic energy of the electrons (across the page).

Image of FIG. 5.
FIG. 5.

Atomic autoionization spectra of molecular oxygen measured at 34.729, 38.71, 40.814, 48.372, and , respectively.

Image of FIG. 6.
FIG. 6.

Spectra of photoelectrons associated with the “A1” autoionization line measured at 34.729, 38.71, 40.814, 48.372, and photon energy, respectively.

Image of FIG. 7.
FIG. 7.

Double ionization electron spectra of the ground state extracted from the coincidence maps at (lower panel) and (middle panel) photon energies as described in the text. Comparison to a numerically calculated spectrum (upper panel) which takes only direct Franck–Condon (FC) transitions into account.

Image of FIG. 8.
FIG. 8.

Single electron spectrum (upper panel), electron-in-pairs spectrum (middle panel), and the quantum yield of double ionisation [lower panel; cf. Eq. (4)] from singly ionized levels both above and below the double ionization threshold at photon energy.


Generic image for table
Table I.

Energies and assignments of the atomic autoionization lines shown in Figs. 2 and 5, respectively, based on Refs. 22–29. The primes and double primes refer to the and ion cores, respectively.

Generic image for table
Table II.

Levels of appearing as comparatively sharp features in Figs. 3 and 6.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Valence double ionization of O2 at photon energies below and above the molecular double ionization threshold