Abstract
The relative double-photoionization cross section of neutral clusters was investigated using monochromatized synchrotron radiation between 18 and 283 eV. Our measurement of the double-to-single photoionization ratio reveals two modulating components that are superimposed on a smooth ratio curve from threshold (19.0 eV) up to 280 eV, when inner-shell excitations become possible. The maxima in the modulation can be related to geometrical dimensions of the cluster.
- Received 30 September 2005
DOI:https://doi.org/10.1103/PhysRevLett.96.023001
©2006 American Physical Society