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physics.atom-ph2013★ 9 cited
Non-existence of Taylor expansion in time due to cusps
Zeng-hui Yang, Kieron Burke
In the usual treatment of electronic structure, all matter has cusps in the electronic density at nuclei. Cusps can produce non-analytic behavior in time, even in response to pertu…
physics.atom-ph2009★ 6 cited
Must Kohn-Sham Oscillator Strengths be Accurate at Threshold?
Zeng-hui Yang, Meta van Faassen, Kieron Burke
The exact ground-state Kohn-Sham(KS) potential for the helium atom is known from accurate wavefunction calculations of the ground-state density. The threshold for photoabsorption f…