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We report the total integrated cross-section (TICS) of two-photon doubleionization of helium in the photon energy range from 42 to 50 eV. Ourcomputational procedure relies on a numerical solution of the time-dependentSchr\"odinger equation on a square-integrable basis and subsequent projectionof this solution on a set of final states describing two electrons incontinuum. Close to the threshold, we reproduce results previously known fromthe literature. The region 47-50 eV seems to have been previously unexplored.Our results suggest that TICS, as a function of the photon energy, growsmonotonously in the region 42-50 eV. We also present fully resolved tripledifferential cross sections for selected photon energies.Comment: 12 pages, 3 figure

physical review. a, atomic, molecular, and optical physics/physical review, a, atomic, molecular, and optical physics

Two-photon double ionization of helium in the region of photon energies<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>42</mml:mn><mml:mo>–</mml:mo><mml:mn>50</mml:mn><mml:mspace width="0.3em" /><mml:mi>eV</mml:mi></mml:mrow></mml:math>

Two-photon double ionization of helium in the region of photon energies42–50eV