Abstract
Photoelectron spectra and zero-volt electron scans were measured following synchrotron-radiation excitation of argon, to elucidate the photon energy range between threshold and the Cooper-minimum region of the Ar 3s photoline. A number of the ``correlation satellite'' lines show a dramatic increase of fractional intensity, yielding a total of about forty observed photolines at threshold. This effect is interpreted as arising from strong interchannel coupling near threshold, yielding high--angular-momentum ionic states otherwise inaccessible. The distinction between ``intrinsic'' correlation effects due to discrete states and ``dynamic'' correlations arising through the photoemission process is emphasized.
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