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  Ab Initio Precision Study of High-Lying Doubly Excited States of Helium in Static Electric Fields: Complex-Scaling Generalized Pseudospectral Method in Hyperspherical Coordinates
 

 

 
 

Time: 1:30pm, April 26 (Thursday)

Title: Ab Initio Precision Study of High-Lying Doubly Excited States of Helium in Static Electric Fields: Complex-Scaling Generalized Pseudospectral Method in Hyperspherical Coordinates

Speaker: Dr. John Heslar
   (Center for Quantum Science and Engineering, Department of Physics, National Taiwan University)

Place: Information Building 2F CS247

Abstract:
We present a new complex-scaling (CS) generalized pseudospectral (GPS) method in hyperspher- ical
coordinates (HSC) for ab initio and accurate treatment of the resonance energies and autoion- ization
widths of two-electron atomic systems in the presence of strong dc electric field. The GPS method
allows non-uniform and optimal spatial discretization of the two-electron Hamiltonian in HSC
with the use of only a modest number of grid points. The procedure is applied for the first precision
calculation of the energies and autoionization widths for the high-lying 1Se, 1Po, 1De,
and 1Fo (n = 10 to 20) doubly-excited resonance states of He atoms.
In addition, we present the first theoretical prediction of the energies and widths of high-lying
doubly-excited resonance states of 1Po (n = 8 − 15) in external dc electric field strengths of
3.915 − 10.44 kV/cm. The calculated dc-field perturbed high-lying resonance energies are in good agreement
with the latest experimental data.

 

 

     
 
Update: 2012/4/19
Contacts: Li-Chun Chen

 
   
 
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