Mainz 2017 – scientific programme
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A: Fachverband Atomphysik
A 20: Poster Session I
A 20.22: Poster
Tuesday, March 7, 2017, 17:00–19:00, P OG1
IR-assisted XUV multiphoton ionization of N2 at FLASH — •yifan liu1, kirsten schnorr1, georg schmid1, sven augustin1, severin meister1, hannes lindenblatt1, yuhai jiang2, thomas ding1, rolf treusch3, stefan düsterer3, kamal p singh4, mathieu gisselbrecht5, thomas pfeifer1, and robert moshammer1 — 1Max Planck Institute for Nuclear Physics, Saupfercheckweg 1, 69117, Heidelberg, Germany — 2Shanghai Advanced Research Institute, Zhangjiang, 201210, Shanghai, China — 3Deutsches Elektronen-Synchrotron, Notkestrasse 85, 22607, Hamburg, Germany — 4Indian Institutes of Science Education and Research, Sector 81, 140306, Manauli, Indian — 5Lund University, Lund, Post Box 118, 22100, Sweden
IR-assisted XUV multiphoton experiments on molecule N2 were performed at the free-electron-laser in Hamburg(FLASH). Within an XUV-pump/IR-probe scheme, the fragmentation and Multiple Ionization dynamics of N2 has been investigated using a dedicated Reaction-Microscope(ReMi). By adjusting the delay between the optical laser and XUV pulse, the ionization yields as a function of delay were recorded. By tracing the kinetic energy release of coincidence channels N(1,1) and N(2,1)as a function of delay in different laser fields, we find an enhanced yield of coincident fragments produced by XUV multiphoton absorption with the presence of a delayed NIR pulse. Sequential ionization is to be the dominant process. The enhanced ionization process is as well related to the polarization direction of the NIR laser pulse.