Absorption of atomic Ca, Cr, Mn and Cu

Conference · Mon Aug 01 04:00:00 EDT 1994

OSTI ID:61767

Arp, U ^[1]

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1. National Institute of Standards and Technology, Gaithersburg, MD (United States)

The 1s and 2p absorption spectra of some key elements at the beginning, in the middle, and at the end of the first transition series have been studied. The 1s absorption spectra of atomic Ca, Cr, Mn and Cu and the 2p absorption spectra of Mn and Cu were determined, using monochromatized synchrotron radiation of the storage rings DORIS III, MAX I and Super-ACO in connection with a high-temperature absorption-furnace. The 2p total photoion yield spectra of Cr and Cu were determined using monochromatized synchrotron radiation of the PHOTON FACTORY storage ring and a vapor jet emitted by an electron-bombardment heated oven. It is clearly shown that many electron effects which are crucial for the explanation of the 3p absorption spectra are much less important for the understanding of the 1s and 2p absorption spectra. The comparison of absorption spectra of free atoms with spectra of the corresponding solids shows the localized character of excitations like np {yields} 3d and the delocalized character of np {yields} 4s and 1s {yields} 4p excitations. The binding energy shifts when going from the free atom to the solid are well described by a thermodynamical model, except for the chromium 2p threshold.

• Research Organization: Argonne National Lab., IL (United States)
• OSTI ID: 61767
• Report Number(s): ANL/APS/TM--14; CONF-9404198--; ON: DE95006077
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CALCIUM
CHROMIUM
COPPER
INNER-SHELL EXCITATION
MANGANESE
SYNCHROTRON RADIATION