Bare Lithium at High Photon Energies
Abstract
We have measured partial ion-yields of lithium for up to 1260 eV photon energy and determined the triple-to-single photoionization ratio. The experiment was conducted at the Multilayer beamline at the Synchrotron Radiation Center (SRC) using an ion time-of-flight spectrometer in pulsed extraction mode. The complete break-up of the Li atom into four particles can occur only by simultaneous ejection of all three electrons, i.e., Auger decay processes cannot contribute to the triple ionization cross section. Also, in contrast to other atoms, Li has only one triple-ionization threshold, which makes it well suited as a unique source of information on pure three-electron correlation, and corresponding theoretical calculations can be compared directly with experimental results. Most theoretical predictions of the triple-to-single photoionization ratio are available only for the high-energy limit. Recently, a calculation was performed for high, but finite energies(T. Pattard and J. Burgdörfer, Phys. Rev. A 63) 020701 (2001).. We compare our results with this new theory.
- Publication:
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APS Division of Atomic, Molecular and Optical Physics Meeting Abstracts
- Pub Date:
- May 2001
- Bibcode:
- 2001APS..DMP.D5079W