Seminar of atomic physics

fall 2022

Past seminars:

October 3, 2022: Experimental aspects of attosecond streaking spectroscopy; Christian Schroder; (TU Munich); Attosecond streaking spectroscopy is a technique with which the dynamicsof the photoionization process in atoms, molecules and solids can be investigated. The implementation of the technique in the attosecond labsat E11 will be discussed, as well as its application to a few select molecular systems which are currently of interest in the community. A dedicated second part of the talk will deal with the analysis of data from attosecond streaking experiments. Common approaches will be presented and compared w.r.t. to their fitness for use in attosecond metrology.
October 20, 2022: Production and destruction of ions HCN⁺ and HNC⁺ in reactions with hydrogen; Petr Dohnal; Department of surface and plasma physics, MFF UK; Chemistry of interstellar space. Reactions in 22 pole radiofquency ion trap. Unusula temperature dependence of reaction rates.
October 24, 2022: Imaging charge migration in chiral molecules using time-resolved x-ray diffraction; Sucharita Giri; Department of physics, IIT Bombay, India; Chirality, which can be defined as the geometric property of a molecule being non-superimposable on its mirror image, is a general property observed in nature. A linearly polarised pulse is used to induce the charge migration [PRA102(2020)063103], which is imaged by time-resolved x-ray diffraction. It is found that the total time-resolved diffraction signals are significantly different for both enantiomers as a function of pump-probe time delay [PRA104(2021)053115]. Furthermore, a connection between time-resolved x-ray diffraction and electronic continuity equation has been discussed by analysing time-dependent diffraction signal and the time-derivative of the total electron density in the momentum space.
November 10, 2022: Vibrational excitation and dissociative attachment in HNCO, 2D model.; Jiří Trnka; UTF, MFF UK
November 14 2022: Surface flux techniques for computing photoelectron spectra in single ionization.; Stefanos Carlstrom; Mathematical Physics Dept., Lund University, Sweden; In strong-field experiments, fully differential photoelectron spectra are vital tools for the understanding of the physical processes under study. Classical methods for obtaining the photoelectron spectra from a solution of the time-dependent Schrödinger equation, such as full diagonalization of the Hamiltonian and the window methods, require storing the full wavefunction in memory. This can quickly become very costly, both in terms of memory and processing power required. A different class of methods instead rely on recording the flux of the photoelectron through a surface and integrating this to form the final spectrum. In my talk, I will discuss the extension of these techniques to the multichannel case.
November 24, 2022: Electon collisions with novel dielectric gases; Juraj Fedor; J. Heyrovský Institute of Physical Chemistry
December 1, 2022, this time at 10:00: No seminar planned, but you can visit PhD defense by; Jan Dvořák; UTF MFF UK
December 8, 2022: Collective vibrations and giant resonances in atomic nuclei; František Knapp; Institute of Particle and Nuclear Physics, MFF UK
December 15, 2022: Abiotic Production of O₂; Karel Houfek; UTF MFF UK