Speaker: Atia Tul Noor, DESY
Program Description:
Ionization and fragmentation of CO2 molecule has been extensively studied because of its importance in the planetary atmosphere. Recent developments in intense laser sources with ultrashort pulse durations has made it possible to investigate the time resolved photo-ionization of CO2 system. Here we are presenting the ionization and fragmentation of singly and doubly charged carbon dioxide molecules using a multi-coincidence ion-imaging technique in a pump-probe experiment. The experiment was carried out using a cold-target recoil ion momentum spectroscopy (COLTRIMS) reaction microscope [1-2] at the beamline FL26, FLASH2 at DESY in Hamburg.
We investigate the dissociative double ionization of CO2 molecules by using ultrafast extreme-ultraviolet pump from FEL beam and time-delayed near-infrared probe pulses. The temporal resolution achieved during the experiment is about less than 30fs. Kinetic energy release and momentum correlations for the two-body CO+ + O+ fragmentation products are determined by 3D coincidence fragment imaging. The transient enhancement of the yield of two-body Coulomb explosion events and the time dependence of low kinetic energy release dissociation events of CO+ are discussed in terms of dissociative ionization and Coulomb explosion dynamics.
[1] Schmid, G., Schnorr, K., Augustin, S., Meister, S., Lindenblatt, H., Trost, F., Liu, Y., Braune, M., Treusch, R., Schroter, C. D., Pfeifer, T. & Moshammer, R. (2019). J. Synchrotron Rad. 26, 854-867.
[2] Meister, S., Lindenblatt, H.,Trost, F., Schnorr, K., Augustin, S., Braune, M., Treusch, R., Pfeifer, T., Moshammer, R. Atomic, Molecular and Cluster Science with the Reaction Microscope Endstation at FLASH2. Appl. Sci. 2020, 10, 2953. https://doi.org/10.3390/app10082953
