Speaker
Ms
Madhushani Wickramarathna
(Western Michigan University)
Description
Double photoionization calculations are performed for atomic oxygen which leaves a residual ion core with a complicated electron structure. An R-matrix with pseudostates (RMPS) method (P. G. Burke, R-matrix Theory of Atomic Collisions, Springer, 2011) is successfully applied to compute the double photoionization cross sections that are in overall agreement with recent experimental results at the Advanced Light Source in Berkeley. In addition to the smooth and linear behavior of these cross sections, strong resonance features are observed similar to double photoionization of atomic helium (Gorczyca et al., JPB, 46, 195201, 2013). In the future, we will expand these RMPS calculations to analyze the inner-shell double ionization of atomic oxygen, which is highly important in astrophysical processes in interstellar medium (Gorczyca et al., APJ, 779, 78, 2013).
Primary author
Ms
Madhushani Wickramarathna
(Western Michigan University)
Co-authors
Dr
Connor Ballance
(Queen's University Belfast)
Prof.
Thomas Gorczyca
(Western Michigan University)
Dr
Wayne Stolte
(National Security Technologies, SSRL, and ALS)
