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Physics  2005 

Double-Pole Approximation in Time-Dependent Density Functional Theory

DOI: 10.1002/qua.20964

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Abstract:

A simple approximate solution to the linear response equations of time-dependent density functional theory (TDDFT) is given. This extends the single-pole approximation (SPA) to two strongly-coupled poles. The analysis provides both an illustration of how TDDFT works when strong exchange-correlation effects are present and insight into such corrections. For example, interaction can cause a transition to vanish entirely from the optical spectrum.

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