Abstract
The photoionization of argon clusters with an average size of 270 atoms per cluster was investigated in the vicinity of the Ar 3s → np autoionizing resonances using angle-resolved time-of-flight photoelectron spectroscopy. The Ar 3p outer-valence photoelectron spectra were measured as two-dimensional maps that show the resonance profiles for free atoms as well as for the cluster. For the first time, partial photoelectron yields and photoelectron angular distributions for the two spin–orbit components in argon clusters are reported as a function of the photon energy. The angular distributions of cluster photoelectrons differ substantially from the atomic ones and, moreover, allow identification of bulk and surface resonances.
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