Angular distributions of inner-shell photoelectrons from rare-gas clusters

作者：Zhang H^*; Rolles D; Pesic Z D; Bozek J D; Berrah N

来源：Physical Review A, 2008, 78(6): 063201.

DOI：10.1103/PhysRevA.78.063201

• argon
• atomic clusters
• fine structure
• krypton
• molecule-photon collisions
• photoelectron spectra
• photoionisation
• time of flight spectra
• xenon

The photoionization of Ar, Kr, and Xe rare-gas clusters was investigated using angle-resolved time-of-flight photoelectron spectroscopy. Fine-structure-resolved photoelectron angular distributions were determined for the Ar 2p, Kr 3d, and Xe 4d core levels and the Ar 3s inner-valence level as a function of photon energy for two average cluster sizes. Overall, the angular distributions of inner-shell photoelectrons from the cluster and the free atom are found to be very similar, except for the first 10-15 eV above the respective photoionization thresholds, where the angular anisotropy of the atomic photoelectrons is high, while our measurements demonstrate considerably less anisotropy in the cluster photoelectron emission. The angular distribution of Ar 3s inner-valence photoelectrons from the cluster is substantially less anisotropic than for the atomic photoelectrons throughout the covered photon energy range, but the difference decreases for increasing photon energy.

• 出版日期2008-12