4:00 PM–4:00 PM, Thursday, May 19, 2005
Burnham Yates Conference Center - Lancaster 4:00-6:00 pm
Anh-Thu Le
(Department of Physics, Kansas State University)
Toru Morishita
(University of Electro-Communications, Japan)
Xiao-Min Tong
Chii-Dong Lin
(Department of Physics, Kansas State University)
Recently proposed diabatization and truncation techniques are used in solving Schr\"{o}dinger equation for two-electron systems. Within this method, it is easy to obtain relatively high accurate energy levels for doubly-excited states of a given symmetry. Nearest-neighbor spacings (NNS) statistics of the energy levels are performed for real 3D helium atom below ionization threshold $I_{20}$. The ss model of helium-like ions are also used, which allows us to analyze NNS up to $I_{35}$. We show evidence of the transition towards Wigner distribution as the energy range gets closer to double-ionization threshold.