Electronic correlation in the PDI of the He-isoelectronic sequence

S. OTRANTO AND C. R. GARIBOTTI

Rio de Janeiro-Brasil

Conferencia; XIX International Conference on Atomic Physics (ICAP); 2004

Optic and Photonics Research Center, University of Sao Paulo

Photo double ionization (PDI) of two-electron atoms is a showcase for the investigation of electronic correlation effects. This results from the single electron nature of the operators conforming the electromagnetic dipole Hamiltonian, which lead to an exact zero value for the transition amplitude when initial and final states do not include the electronic correlation. In a previous article [1] we have studied angular distributions for PDI of twoelectron ions, using a recently introduced analytical model for the two electron continuum [2]. We have found that for fixed energetic configurations, the angular patterns change dramatically with the target charge. These effects are more noticeable when the two electrons are emitted with unequal energies. Furthermore, we have found that the scaling behavior predicted by Kornberg and Miraglia in 1994 [3], turns meaningful as the nuclear charge increases. In this work we compare angular distributions for different nuclear charges under equivalent energies. As could be inferred from Fig. 1, the electronic correlation is responsible for the strong peak at 180° for the He case. As the atomic nucleus charge increases secondary structures become competitive, clearly indicating a switching of the preferred emission mechanisms. Figure 1: Angular distributions for equivalent energies. For the He atom case we consider E1 = 5eV and a final energy Ef = 52.9eV. 1 = 5eV and a final energy Ef = 52.9eV. 1 = 5eV and a final energy Ef = 52.9eV. [1] S. Otranto and C. R. Garibotti, Eur. Phys. J. D 27, 215 (2003). [2] S. Otranto and C. R. Garibotti, Eur. Phys. J. D 21, 285 (2002). [3] M. A. Kornberg and J. E. Miraglia, Phys. Rev. A 49, 5120 (1994).27, 215 (2003). [2] S. Otranto and C. R. Garibotti, Eur. Phys. J. D 21, 285 (2002). [3] M. A. Kornberg and J. E. Miraglia, Phys. Rev. A 49, 5120 (1994).21, 285 (2002). [3] M. A. Kornberg and J. E. Miraglia, Phys. Rev. A 49, 5120 (1994).49, 5120 (1994). Z6 TDCS (a.u)6 TDCS (a.u)