Erlangen 2018 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
A: Fachverband Atomphysik
A 25: Poster Session I
A 25.46: Poster
Dienstag, 6. März 2018, 16:15–18:15, Redoutensaal
Fragmentation Dynamics of Argon Dimers and Multi-Photon Ionization of Atomic Argon Studied by XUV-IR Experiments at FLASH — •Georg Schmid1, Kirsten Schnorr1, Sven Augustin1, Hannes Lindenblatt1, Severin Meister1, Thomas Ding1, Yifan Liu1, Kamal P. Singh2, Mathieu Gisselbrecht3, Harald Redlin4, Stefan Düsterer4, Rolf Treusch4, Claus-Dieter Schröter1, Thomas Pfeifer1, and Robert Moshammer1 — 1Max-Planck-Institut für Kernphysik, Heidelberg — 2IISER, Mohali, India — 3Lund University, Sweden — 4DESY, Hamburg
Different XUV multi-photon ionization pathways of Ar2 dimers such as interatomic coulombic decay (ICD) and charge transfer at a curve crossing (CT-CC) were identified by measuring the kinetic-energy release of the Coulomb-exploded dimer fragments using a reaction microscope. By applying an intense IR probe pulse, we were able to follow the dynamics of these fragmentation pathways in real time. Amongst other things, we have deduced an average lifetime for the charge transfer channel Ar2+(3p−3nl)−Ar → Ar+(3p−2n′l′) +Ar+(3p−1), which agrees with theoretical calculations.
Furthermore, we investigated XUV multi-photon ionization of atomic Ar at FEL intensities of I ∼ 5 × 1013 W/cm2 and measured charge states up to Ar5+. An IR probe pulse enabled to distinguish between sequential and non-sequential ionization routes and revealed intermediate resonances.