Oscillations in the double-photoionization cross section of Li near threshold.
The threshold region of the double-photoionization cross section of lithium was investigated using monochromatized synchrotron radiation and ion time-of-flight spectrometry. While the overall energy dependence can be described by the Wannier power law, we found oscillations in the cross section which are in good agreement with a modulated threshold law as proposed by Temkin [Phys. Rev. Lett. 49, 365 (1982)]]. This behavior may be due to the unequal binding energies of the electrons involved in the double-photoionization process.
Wehlitz
R
R
Synchrotron Radiation Center, University of Wisconsin, Stoughton, Wisconsin 53589, USA.
Bluett
J B
JB
Whitfield
S B
SB