Photoexcited K-Auger Spectra Of Atomic And Molecular-Oxygen

    Authors

    C. D. Caldwell; S. J. Schaphorst; M. O. Krause;J. Jimenezmier

    Comments

    Authors: contact us about adding a copy of your work at STARS@ucf.edu

    Abbreviated Journal Title

    J. Electron Spectrosc. Relat. Phenom.

    Keywords

    ELECTRON-IMPACT IONIZATION; COLLISION INTERACTION PCI; CORE-EXCITED O-2; ANGULAR-DISTRIBUTION; HIGH-RESOLUTION; GAS ATOMS; DECAY; SHELL; SPECTROSCOPY; AUTOIONIZATION; Spectroscopy

    Abstract

    K Auger spectra of the oxygen atom following either 1s photoionization or 1s -- > np photoexcitation are presented and compared with energy and transition rate calculations where available. Data are juxtaposed to earlier results on neon, showing that the excellent agreement between theory and experiment which exists for the closed-shell atom neon does not, at present, extend to the open-shell atom oxygen. Auger spectra following 1s -- > 2p excitation in the O atom and 1s, 2p double ionization in Ne are found to have similar branching ratios. All major lines in the Auger spectra of oxygen could be resolved and fully analyzed with regard to energies, branching ratios, and angular distributions. A strong anisotropy is measured for the Auger transitions associated with the 1s -- > 2p excitation. The 1sigma(u) -- > 1pi(g) and 1sigma(g) -- > 3sigma(u) resonance Auger spectra of molecular oxygen are also presented. The angular distributions of the high kinetic energy lines in the molecular spectra are measured, and the atomic-like Auger lines in the 3sigma(u) decay are compared with the pure atomic 2p decay spectrum. Energies of the Kalpha X-ray transitions in the atom are deduced. The experimental setup, which allowed us to record these low-Z atomic Auger spectra for the first time, is described in some detail.

    Journal Title

    Journal of Electron Spectroscopy and Related Phenomena

    Volume

    67

    Issue/Number

    2

    Publication Date

    1-1-1994

    Document Type

    Article

    Language

    English

    First Page

    243

    Last Page

    259

    WOS Identifier

    WOS:A1994NJ32900004

    ISSN

    0368-2048

    Share

    COinS