High resolution measurements of partial photoionization cross sections in hollow lithium: A critical comparison with advanced many-body calculations

Photoelectron data for hollow lithium states obtained with unprecedented high spectral resolution and sensitivity are presented. A critical comparison is made with the most recent theoretical results. Partial cross sections are measured providing the first definitive test of advanced {ital ab} {ital initio} calculations for this highly excited four-body atomic system. {copyright} {ital 1996 The American Physical Society.}