Rostock 2019 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 34: Interaction with VUV and X-ray light

A 34.6: Poster

Donnerstag, 14. März 2019, 16:15–18:15, S Fobau Physik

Relaxation dynamics of CH3I and CH2I2 following FEL-induced inner-shell ionisation — •Florian Trost¹, Kirsten Schnorr¹, Sven Augustin¹, Severin Meister¹, Hannes Lindenblatt¹, Yifan Liu¹, Marc Simon², Renaud Guillemin², Maria Novella Piancastelli³, Farzad Hosseini², Mustafa Zmerli², Markus Braune⁴, Marion Kuhlmann⁴, Thomas Pfeifer¹, and Robert Moshammer¹ — ¹Max-Planck-Institut für Kernphysik, Heidelberg — ²Université Pierre-et-Marie-Curie, Paris — ³Uppsala Universitet, Uppsala — ⁴DESY, Hamburg

Using the reaction microscope endstation at the free-electron laser (FEL) in Hamburg (FLASH), the relaxation dynamics of methyl iodide (CH3I) and diiodomethane (CH2I2) after inner-shell ionisation have been studied. FLASH2's XUV (12.7 nm) photons were used to ionise the iodine 4d inner shell electrons twice sequentially using an XUV pump - XUV probe technique with variable delay. The first XUV photon induces the dissociation of the doubly charged molecule. The absorption of the second photon, leading to quadruply charged ions, allows to probe the dissociation. The momentum-resolved data of the coincident fragments of the dissociated molecules will be presented.