Enabling momentum-imaging studies of competing proton and hydrogen elimination channels initiated by a strong laser field

We are interested in imaging and controlling proton versus atomic hydrogen elimination in the strong-field induced dissociation of hydrocarbon molecular ions, such as H$^+ + $ C$_2$H and H + C$_2$H$^+$ from C$_2$H$_2^+$. To permit kinematically complete measurements of these processes, we employ ``fast" (few keV) molecular ion-beam targets, allowing the detection of both neutral and charged fragments [1]. However, measuring breakup channels with large mass asymmetries simultaneously is difficult [2]. We present an upgrade of our coincident three-dimensional momentum imaging method to overcome these challenges and measure the proton and hydrogen elimination channels. \newline [1] I. Ben-Itzhak \emph{et al.}, Phys. Rev. Lett. \textbf{95}, 073002 (2005). \newline [2] L. Graham \emph{et al.}, Phys. Rev. A \textbf{91}, 023414 (2015).