Abstract
Excitations in time-dependent density-functional theory (DFT) were discussed. It was shown that when the excitations of a system were discrete, an approximate solution, that can be made arbitrarily accurate, can be used to understand. The approximation yielded simple expressions for Gȯrling-Levy perturbation theory results and a method for estimating expectations values of the unknown exchange-correlation level.
| Original language | English |
|---|---|
| Article number | 043005 |
| Pages (from-to) | 430051-430054 |
| Number of pages | 4 |
| Journal | Physical Review Letters |
| Volume | 90 |
| Issue number | 4 |
| State | Published - 31 Jan 2003 |
| Externally published | Yes |