K-shell excitation spectra of CO, N2 and O2

Hitchcock, Adam P.; Brion, C.E.

doi:10.1016/0368-2048(80)80001-6

Cited by 374 publications

(153 citation statements)

References 32 publications

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“…1. Compared with gas-phase O 2 (18) schematically illustrated in Fig. 1, these high-pressure oxygen phases display similar spectral features because of the transitions of 1s core-level electrons to the antibonding 1 g * and 3 u * orbitals (hereafter referred to as * and * transitions, respectively), which provide a direct indication of their molecular nature.…”

Section: Resultsmentioning

confidence: 99%

Inelastic x-ray scattering of dense solid oxygen: Evidence for intermolecular bonding

Meng

Eng

Tse

et al. 2008

Proc. Natl. Acad. Sci. U.S.A.

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The detailing of the intermolecular interactions in dense solid oxygen is essential for an understanding of the rich polymorphism and remarkable properties of this element at high pressure. Synchrotron inelastic x-ray scattering measurements of oxygen K-edge excitations to 38 GPa reveal changes in electronic structure and bonding on compression of the molecular solid. The measurements show that O 2 molecules interact predominantly through the half-filled 1π g * orbital <10 GPa. Enhanced intermolecular interactions develop because of increasing overlap of the 1π g * orbital in the low-pressure phases, leading to electron delocalization and ultimately intermolecular bonding between O 2 molecules at the transition to the ε-phase. The ε-phase, which consists of (O 2 ) 4 clusters, displays the bonding characteristics of a closed-shell system. Increasing interactions between (O 2 ) 4 clusters develop upon compression of the ε-phase, and provide a potential mechanism for intercluster bonding in still higher-pressure phases.

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Section: Resultsmentioning

confidence: 99%

Inelastic x-ray scattering of dense solid oxygen: Evidence for intermolecular bonding

Meng

Eng

Tse

et al. 2008

Proc. Natl. Acad. Sci. U.S.A.

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“…2D) confirm the presence of a remnant siderite and show a spectroscopic signature for the transformed carbonate with a main peak shifted at 290.7 eV. The smaller peak at 287.5 eV corresponds to the presence of carbon monoxide (CO) (25) probably present as inclusions/nanobubbles that give the particular microstructure of this high-pressure phase (Fig. 2B).…”

Section: Resultsmentioning

confidence: 76%

New host for carbon in the deep Earth

Boulard

Gloter

Corgne

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

126

140

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The global geochemical carbon cycle involves exchanges between the Earth's interior and the surface. Carbon is recycled into the mantle via subduction mainly as carbonates and is released to the atmosphere via volcanism mostly as CO 2 . The stability of carbonates versus decarbonation and melting is therefore of great interest for understanding the global carbon cycle. For all these reasons, the thermodynamic properties and phase diagrams of these minerals are needed up to core mantle boundary conditions. However, the nature of C-bearing minerals at these conditions remains unclear. Here we show the existence of a new Mg-Fe carbon-bearing compound at depths greater than 1,800 km. Its structure, based on three-membered rings of corner-sharing ðCO 4 Þ 4− tetrahedra, is in close agreement with predictions by first principles quantum calculations [Oganov AR, et al. (2008)

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“…The main uncertainty in the photon energy determination results from the uncertainties, given in the literature, for the energies of the absorption lines used for calibration. To our knowledge, all the synchrotron radiation based experiments on the K-shell photoionization of O 2 refer to the electron energy-loss spectroscopy (EELS) works of Brion and co-workers [32,33]. They determined the energy of the 1s → 1π * transition at 530.8 eV with a stated accuracy of ±200 meV.…”

Section: Excitation Source and Energy Calibrationmentioning

confidence: 99%

“…They determined the energy of the 1s → 1π * transition at 530.8 eV with a stated accuracy of ±200 meV. By measuring the ion yield in a gas cell, Coreno and co-workers [34] improved the accuracy for this line to ±100 meV by normalization on the 1s → 1π * transition EELS measurements, both for O 2 [33] and CO [35], the latter being quoted to an accuracy of ±90 meV. To double-check this determination independently of the relatively low-resolution EELS measurements, we used a Scienta electron spectrometer installed on a second branch of the PLEIADES beam line.…”

Section: Excitation Source and Energy Calibrationmentioning

confidence: 99%

K-shell photoionization ofO+andO2+ions: Experiment and theory

et al. 2015

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Absolute cross sections for the single and double K-shell photoionization of carbonlike O 2+ and nitrogenlike O + ions were measured in the 526-620-eV photon energy range by employing the ion-photon merged-beam technique at the SOLEIL synchrotron radiation facility. High-resolution spectroscopy up to E/ E ≈ 5300 was achieved. Rich resonance structures observed in the experimental spectra are analyzed and identified with the aid of R-matrix and multiconfiguration Dirac-Fock (MCDF) methods. For these two atomic oxygen ions of particular astrophysical interest we characterized the strong 1s → 2p and the weaker 1s → np (n > 2) resonances observed. A detailed comparison of the energies of the 1s → 2p resonances in the first members of the oxygen isonuclear sequence measured by synchrotron based experiments and the Chandra and XMM-Newton x-ray satellites is presented.

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K-shell excitation spectra of CO, N2 and O2

Cited by 374 publications

References 32 publications

Inelastic x-ray scattering of dense solid oxygen: Evidence for intermolecular bonding

Inelastic x-ray scattering of dense solid oxygen: Evidence for intermolecular bonding

New host for carbon in the deep Earth

K-shell photoionization ofO+andO2+ions: Experiment and theory

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