Hannover 2020 – scientific programme

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A: Fachverband Atomphysik

A 22: Poster Session - Atomic Physics III

A 22.26: Poster

Wednesday, March 11, 2020, 16:00–18:00, Empore Lichthof

Relaxation dynamics of CH3I and CH2I2 following FEL-induced inner-shell ionisation — •Florian Trost¹, Kirsten Schnorr², Sven Augustin², Severin Meister¹, Hannes Lindenblatt¹, Patrizia Schoch¹, Yifan Liu¹, Marc Simon³, Renaud Guillemin³, Maria Novella Piancastelli⁴, Farzad Hosseini³, Mustafa Zmerli³, Markus Braune⁵, Marion Kuhlmann⁵, Thomas Pfeifer¹, and Robert Moshammer¹ — ¹Max-Planck-Institut für Kernphysik, Heidelberg — ²Paul Scherrer Institut, Villigen — ³Université Pierre-et-Marie-Curie, Paris — ⁴Uppsala Universitet, Uppsala — ⁵DESY, Hamburg

Using the reaction microscope endstation at the free-electron laser (FEL) in Hamburg (FLASH2), 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 higer charged ions, allows to probe the dynamics of the dissociation. The momentum-resolved data of the coincident fragments of the dissociated molecules will be presented.