Interpretation of MVV and L/sub 2/ /sub 3/VV Auger spectra of Co

Conference · Thu Oct 01 04:00:00 EDT 1981

OSTI ID:6000903

Zehner, D M; Noonan, J R; Madden, H H

The MVV and L/sub 2/ /sub 3/VV Auger spectra of Co have been acquired from a clean polycrystalline foil and the intrinsic lineshapes determined using standard deconvolution procedures. In contrast to previous spectra obtained from Cu, the Co lineshapes do not exhibit any narrow, atomiclike features. Although the energies of the peak positions of the lineshapes relative to the high energy thresholds suggest hole-hole interaction energies (U/sub eff/) of approx. 4.5 eV for the MVV and approx. 1 eV for the L/sub 2/,/sub 3/VV transitions respectively, these values are inconsistent with the expected trend of decreasing U/sub eff/ in going from Cu to Co. An alternative explanation is that the energy shifts are related to screening effects resulting from the polarization of the bonding orbitals towards and the anti-bonding orbitals away from the initial core hole. These effects may also contribute to the larger FWHM of the measured spectra as compared to that obtained by self-folding a calculated DOS. However, the differing lifetimes of each initial core hole result in different FWHM for each transition. The interpretation of these spectra and a comparison with similar data for Cu are discussed.

• Research Organization: Oak Ridge National Lab., TN (USA); Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 6000903
• Report Number(s): CONF-811113-38(Draft); ON: DE82003993
• Country of Publication: United States
• Language: English

Related Subjects

640305* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Theory-- (-1987)
74 ATOMIC AND MOLECULAR PHYSICS
AUGER EFFECT
AUGER ELECTRON SPECTROSCOPY
COBALT
COPPER
DATA
ELECTRON SPECTROSCOPY
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY-LEVEL TRANSITIONS
EXPERIMENTAL DATA
HOLES
INFORMATION
METALS
NUMERICAL DATA
SPECTROSCOPY
TRANSITION ELEMENTS
VALENCE