Abstract
We have carried out a relative measurement of the total photoionization cross section of the excited 7${\mathit{D}}_{5/2}$ state of cesium for photoelectron energies in the range 0.103--0.127 Ry above the ionization threshold. Separate measurements were made using two different combinations of laser sources to populate and photoionize the 7${\mathit{D}}_{5/2}$ state. The first measurement was made with a cw diode laser and two pulsed dye lasers, while the second was made with three pulsed dye lasers. The measured cross section was found to vary slowly within experimental uncertainty over this energy range but was otherwise featureless. This result disagrees with the cross section predicted by a Hartree-Slater calculation [J. Lahiri and S. T. Manson, Phys. Rev. A 33, 3151 (1986)], which displayed a deep minimum in this spectral region.
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