Abstract
The electron emission spectrum resulting from thermal collisions of ${\mathrm{He}}^{\mathrm{*}}$(${2}^{3}$S) atoms with ${\mathrm{LaCoO}}_{3}$ was measured as well as the h\ensuremath{\nu}-dependent photoemission spectra. The ${\mathrm{He}}^{\mathrm{*}}$ spectrum shows that the lower-lying Co 3d derived (main) bands are strongly suppressed relative to the O 2p derived bands, reflecting the spatial distribution of the initial Co 3d wave functions. On the other hand, the higher-lying Co 3d derived (satellite) band is anomalously enhanced in the ${\mathrm{He}}^{\mathrm{*}}$ spectrum. These findings are discussed on the basis of the initial and final configuration interactions, using a ${\mathrm{Co}}_{2}$${\mathrm{O}}_{11}$ cluster.
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