Abstract
The photoionization and photoelectron spectroscopy of He nanodroplets ( atoms) has been studied by photoelectron imaging with photon energies from 22.5–24.5 eV. Total electron yield measurements reveal broad features, whose onset is below the ionization potential of atomic He. The photoelectron spectra are dominated by very low energy electrons, with less than 0.6 meV. These results are attributed to the formation and autoionization of highly vibrationally excited Rydberg states within the cluster, followed by strong final state interactions between the photoelectron and the droplet.
- Received 27 November 2002
DOI:https://doi.org/10.1103/PhysRevLett.91.043401
©2003 American Physical Society