Revealing the Two-Electron Cusp in the Ground States of He and H2 via Quasifree Double Photoionization

Abstract

We report on kinematically complete measurements and ab initio non-perturbative calculations of double ionization of He and H2 by a single 800 eV circularly polarized photon. We confirm the quasifree mechanism of photoionization for H2 and show how it originates from the two-electron cusp in the ground state of a two-electron target. Our approach establishes a new method for mapping electrons relative to each other and provides valuable insight into photoionization beyond the electric-dipole approximation.

arXiv comment7 pages, 4 figures

References in corpus (4)

• Magnetic fields alter tunneling in strong-field ionization
• Ejection of quasi-free electron pairs from the helium atom ground state by single photon absorption
• Observation of Photoion Backward Emission in Photoionization of He and N2
• Separating Dipole and Quadrupole Contributions to Single-Photon Double Ionization

Cited by in corpus (4)

• Chiral photoelectron angular distributions from ionization of achiral atomic and molecular species
• Three-electron correlations in strong laser field ionization: Spin induced effects
• Strong-Field Double Ionization in a Three-Electron Atom: Momentum Distribution Analysis
• Quantum versus semi-classical signatures of correlated triple ionization in Dalitz plots