Fragmentation ofCD+induced by intense ultrashort laser pulses

Abstract

The fragmentation of CD + in intense ultrashort laser pulses was investigated using a coincidence threedimensional momentum imaging technique improved by employing both transverse and longitudinal electric fields. This allowed clear separation of all fragmentation channels and the determination of the kinetic energy release down to nearly zero, for a molecule with significant mass asymmetry. The most probable dissociation pathways for the two lowest dissociation limits, C + + D and C + D + , were identified for both 22-fs, 798-nm and 50-fs, 392-nm pulses. Curiously, the charge asymmetric dissociation of CD 2+ was not observed for 392-nm photons, even though it was clearly visible for the fundamental 798 nm at the same peak intensity.

Direct Measurement of Charge Transfer Probability during Photodissociation of Few-keV OD+ Beam

“…To improve the ability to detect the light D and D + fragments in coincidence with the more massive O and O + , we implemented a two detector imaging scheme in which one detector is dedicated to the detection of the D + fragments while the other detects the rest of the fragments, as shown in Figure . We introduce, in this paper, the upgraded beam fragment momentum imaging setup, which was limited to a mass ratio of about 6 – 7 before, , and provide a few key details about the modifications. Measurements with a mass ratio of 14 were already conducted (and ∼20 within reach).…”

“…However, some of the fragments are lost, for example, by hitting the Faraday cup. These losses affect only the O + + D dissociation channel, and they are corrected using the expected symmetries as explained in the Supporting Information, specifically, the cylindrical symmetry about the linear polarization, i.e., a uniform N (ϕ), and the reflection symmetry about θ = 90° where θ is the angle between the dissociation velocity and the polarization. ,,,− …”