Journal
PHYSICAL REVIEW A
Volume 81, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.81.021401
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Funding
- Max-Planck Advanced Study Group at CFEL
- DFG [JI 110/2-1]
- MICINN [FIS2007-60064]
- COLCIENCIAS
- Cluster of Excellence: Munich Center for Advanced Photonics
- European COST Action CUSPFEL [CM0702]
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Two-photon double ionization (TPDI) of D-2 is studied for 38-eV photons at the Free Electron Laser in Hamburg (FLASH). Based on model calculations, instantaneous and sequential absorption pathways are identified as separated peaks in the measured D+ + D+ fragment kinetic energy release (KER) spectra. The instantaneous process appears at high KER, corresponding to ionization at the molecule's equilibrium distance, in contrast to sequential ionization mainly leading to low-KER contributions. Measured fragment angular distributions are in good agreement with theory.
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