SKM 2023 – scientific programme
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O: Fachverband Oberflächenphysik
O 13: Focus Session: Ion Beam Interaction with Surfaces and 2D Materials II
O 13.7: Talk
Monday, March 27, 2023, 16:45–17:00, GER 38
On the path to ion based pump-probe experiment: generating picosecond keV Ne+ ion pulses from a cooled supersonic gas beam — •Lukas Kalkhoff, Marika Schleberger, Klaus Sokolowski-Tinten, Andreas Wucher, Alexander Golombek, and Lars Breuer — University Duisburg-Essen, Duisburg, Germany
The dynamics triggered by the impact of an ion onto a solid surface has been explored mainly by theoretical modeling or computer simulation to date. Results indicate that the microscopic non-equilibrium relaxation processes triggered by the interaction of the ion with the solid occur on a (sub-)picosecond time scale. A suitable experimental approach to these dynamics therefore requires a pump-probe method with an appropriate time resolution. Our experiments have successfully used laser photoionization of a supersonic beam of cooled noble gas atoms at Tatoms≃ 4 K in combination with a Wiley-MacLaren ion buncher. The measured distribution of the arrival time of individual Ne+ ions impinging on the surface of a fast microchannel plate with a kinetic energy of 4 keV gives a full width at half maximum of the ion pulse of tion=130 ps. A more detailed analysis shows that this pulse width is only an upper limit related to the detection limit of the electronics. The true pulse width results from extrapolation of our data and is tion=18 ±4 ps. This opens the door to pump-probe experiments with keV ions with a time-resolution in the picosecond range.