The absolute triple differential cross section (TDCS) for double photoionization has been determined experimentally for the first time. The investigation was carried out for helium at a photon energy of 99 eV, for equal energy of the emitted electrons and in a plane perpendicular to the photon beam. Electron, ion and combined ion-electron spectrometry measurements were performed to put the data on an absolute scale. The result is compared with two recent calculations, and a parametrization is given which extends the TDCS obtained at one specific geometry to the whole space.
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Schwarzkopf et al. (1995) studied this question.
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