Excitation-energy-dependent resonances in x-ray emissions under near- threshold electron excitation of the Ce 3d and 4d levels

Journal Article · Mon Sep 01 00:00:00 EDT 1975 · J. Vac. Sci. Technol., v. 12, no. 5, pp. 1047-1051

DOI:https://doi.org/10.1116/1.568460· OSTI ID:4141926

Chamberlain, M B; Baun, W L

Soft x-ray appearance potential spectra of the 3d and 4d levels of polycrystalline cerium metal are reported in this paper. Resonant x-ray emissions are observed when the electron-excitation energy sweeps through the ionization energies of the 3d and 4d levels. The resonant x rays excited at the 3d-level onsets are considerably more intense, and are excited at a lower electron-excitation energy than the 3d-series characteristic x rays. In the neighborhood of the 4d-electron thresholds, four line-like structures extend to approx.8 eV below the 4d-electron binding energies, while two broad and more intense structures occur above the 4d onsets, with the largest one reaching a peak intensity at 12 eV above the 4d thresholds. The resonant emissions apparently arise from the decay of threshold-excited states which are bound to the inner vacancy and have core configurations nd$sup 9$4f$sup 3$, (n=3,4). The exchange interaction between the three 4f electrons and the respective d-orbital vacancy spreads the 4d-threshold structures over a 20 eV range of excitation energies and the 3d-threshold structures over a much smaller range.

• Research Organization: Air Force Materials Laboratory (MBM), Wright-Patterson AFB, Ohio 45433
• Sponsoring Organization: USDOE
• NSA Number: NSA-33-001299
• OSTI ID: 4141926
• Journal Information: J. Vac. Sci. Technol., v. 12, no. 5, pp. 1047-1051, Other Information: Orig. Receipt Date: 30-JUN-76
• Country of Publication: United States
• Language: English

Related Subjects

N50230* -Metals
Ceramics
& Other Materials-Metals & Alloys-Properties
Structure & Phase Studies
360104* -Materials-Metals & Alloys-Physical Properties
*CERIUM- X-RAY SPECTRA
BINDING ENERGY
D STATES
ELECTRON BEAMS
EMISSION SPECTRA
EXCHANGE INTERACTIONS
EXCITATION
EXCITED STATES
RESONANCE
SOFT X RADIATION
THRESHOLD ENERGY
ULTRAHIGH VACUUM
X-RAY SPECTROSCOPY