Kiel Nano, Surface and Interface Science (KiNSIS)

Physikalisches Kolloquium

Transient atmospheric plasmas – mastering the nonequilibrium (Prof. Dr. Achim von Keudell, Bochum)

18.05.2021 ab 16:15

Online

Foto von KeudellAbstract

Non equilibrium atmospheric plasmas form the unique basis for a multitude of applications ranging from thin films, surface modification, plasma chemistry to plasma medicine. In all these cases atmospheric pressure plasmas exhibit an intimate coupling to the bounding surfaces that trigger surface and conversion processes. The complexity of these processes makes a detailed understanding very challenging. Prominent examples are the combination of plasmas and catalysis and of plasmas and electrolysis. Plasmas provide either excited species to change the conversion reaction paths or they alter and may regenerate catalytic surfaces. The analysis requires detailed diagnostics of plasma excitation and surface processes at the plasma-solid or the plasma-liquid-solid interfaces. Three examples are being presented: (i) the conversion of CO2 and of volatile organic compounds is studied in atmospheric pressure plasmas revealing a strong non equilibrium with respect to excitation temperatures and plasma dynamics; (ii) the conversion of water by plasma excitation using nanosecond high voltage pulses that trigger extremely high density plasmas that are governed by field effects at the interfaces and by tunneling in between adjacent water molecules during plasma propagation; (iii) the plasma induced triggering of enzyme driven species conversion in biocatalysis. The work is supported by the SFB 1316 “Transient atmospheric pressure plasmas – from plasmas to liquids to solids”.

 

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Quantum carpets: A tool to observe decoherence (Prof. Dr. Wolfgang Schleich, University Ulm)

08.06.2021 ab 16:15

Online

Wolfgang SchleichQuantum carpets [1] - the spatio-temporal de Broglie density profiles- woven by an atom or an electron in the near-field region of a diffraction grating bring to light [2], in real time, the decoherence of each individual component of the interference term of the Wigner function characteristic of Schrödinger cats. The proposed experiments [2] are feasible with present-day technology.

References: [1] M. Berry, I. Marzoli, and W. Schleich, Quantum Carpets, Carpets of Light, Physics World 14, 39-44 (2001)
[2] P. Kazemi, S. Chaturvedi, I. Marzoli, R.F. O’Connell, and W.P. Schleich, Quantum carpets - a tool to observe decoherence, New J. Phys. 15, 013052 (2013)

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