Image based adaptive femtosecond control of ethylene fragmentation
POSTER
Abstract
Using an adaptive femtosecond control scheme, ethylene is ionized by a shaped ultrafast laser pulse, leading to isomerization to the ethylidene (HC-CH3)$^{q+}$ configuration, from which CH$_{3}^{+}$ fragments are generated. Feedback for the control process is obtained by rapidly inverting velocity map images of the CH$_{3}^{+}$ and competing CH$_{2}^{+}$ fragments, allowing identification of dissociation channels and subsequent control of the CH$_{3}^{+}$/CH$_{2}^{+}$ ratio. Additionally, we have identified the C$_{2}$H$_{4}^{+} \quad \to $ C$_{2}$H$_{3}^{+}$ + H and C$_{2}$H$_{4}^{+} \quad \to $ C$_{2}$H$_{2}^{+}$ + H$_{2}$ channels as creating ion images with rich structure that offer possible routes to investigate control via conical intersections on the C$_{2}$H$_{4}^{+}$ potential energy surface.
*Augustana College personnel are supported by NSF grants PHY-0969687 and EPS-0903804 while JRML is supported by the Chemical Sciences, Geosciences, and Biosciences Division, Office of Basic Energy Science, Office of Science, US Department of Energy.