1. Coherent Phase Control of Internal Conversion in Pyrazine
- Author
-
Gordon, Robert J., Hu, Zhan, Seideman, Tamar, Singha, Sima, Sukharev, Maxim, and Zhao, Youbo
- Subjects
Physics - Atomic Physics - Abstract
Shaped ultrafast laser pulses were used to study and control the ionization dynamics of electronically excited pyrazine in a pump and probe experiment. For pump pulses created without feedback from the product signal, the ion growth curve (the parent ion signal as a function of pump/probe delay) was described quantitatively by the classical rate equations for internal conversion of the $S_2$ and $S_1$ states. Very different, non-classical behavior was observed when a genetic algorithm (GA) was used to minimize the ion signal at some pre-determined target time, T. Two qualitatively different control mechanisms were identified for early (T$<1.5$ ps) and late (T$>1.5$ ps) target times. In the former case, the ion signal was largely suppressed for $t
1.5$ ps the ion growth curve followed the classical rate equations for $t - Published
- 2014
- Full Text
- View/download PDF