Abstract
We show that quantum optimal control theory (OCT) and time-dependent density-functional theory (TDDFT) can be combined to provide realistic femtosecond laser pulses for an enhanced ionization yield in few-electron systems. Using a one-dimensional model H molecule as a test case, the optimized laser pulse from the numerically exact scheme is compared to pulses obtained from OCT+TDDFT within the TD exact-exchange (TDEXX) and the TD local-density approximation (TDLDA). We find that the TDDFT pulses produce an ionization yield of up to when applied to the exact system. In comparison, pulses with a single frequency but the same fluence typically reach to yields around 5–15, unless the frequency is carefully tuned into a Fano-type resonance that leads to 30 yield. On the other hand, optimization within the exact system alone leads to yields higher than , demonstrating that correlation effects beyond the TDEXX and TDLDA can give rise to even more efficient ionization mechanisms.
- Received 28 March 2013
DOI:https://doi.org/10.1103/PhysRevA.88.013414
©2013 American Physical Society