Cold molecules and nanoparticles, from controlled chirality to biological macromolecules – fully funded graduate student and/or postdoc positions

Further details on these positions are available at https://www.controlled-molecule-imaging.org/careers

Laser-induced dynamic chirality in molecules and fundamental symmetry aspects (experiment)

The optical centrifuge an be used to create dynamically chiral molecular samples from a priori chiral molecules, as was recently theoretically predicted by our group. These samples provide unique opportunities to investigate the fundamental and applied implications of this symmetry consideration and the importance of chirality, e.g., regarding the homochirality of life.
In this experiment you will set up an optical centrifuge and generate dynamically chiral molecules. These samples will be carefully characterized using our in-house table-top laser systems as well as x-ray facilities, such as Petra III, FLASH, or European XFEL in Hamburg. In collaboration with the parallel theory-work, you will disentangle the implications of true and false chirality as a fundamental aspect of nature.

Laser-induced dynamic chirality in molecules and fundamental symmetry aspects (theory)

The optical centrifuge an be used to create dynamically chiral molecular samples from a priori chiral molecules, as was recently theoretically predicted by our group. These samples provide unique opportunities to investigate the fundamental and applied implications of this symmetry consideration and the importance of chirality, e.g., regarding the homochirality of life.
In this theory project you will extend our predictions of dynamically-induced chirality to experimentally more tractable molecules, will investigate the implications of molecular properties on the applicability of the approach, and predict advanced mechanisms to create chiral samples from chiral molecules. Furthermore, you will compute observables and predict how to detect and investigate the dynamic chirality as well as the implications of true and false chirality in actual experiments, utilizing ultrafast laser systems as well as x-ray facilities. You will closely interact with the experimental team implementing the optical centrifuge for the generation of dynamically chiral molecules.

Imaging controlled nanoparticles: Cooling, controlling, and imaging of nanoparticles (experiment)

Within this project, you will use newly developed sources for cold nanoparticles and bio-molecules, such as cryogenic buffer-gas cells, and develop advanced methods to strongly control these systems. The shock-frozen, cold samples emitted from the buffer-gas cell can be further controlled using strong inhomogeneous electric fields. This allows one to select single structural isomers, i.e., different structural arrangements such as folded vs. globular proteins, based on their distinct interactions with the field. Furthermore, in combination with strong ac electric or laser fields these systems can be aligned and oriented in space, rendering the individual molecules practically identical even in laboratory space. The developed experimental setups will be employed for novel diffractive- imaging experiments, both at FEL facilities as well as in laboratory based setups.

Laser-induced electron diffraction of chemical dynamics (experiment)

We are exploring the applicability of laser-induced electron diffraction (LIED) to complex molecular systems and their chemical dynamics.
In the first stage of the project, we have unraveled the influence of the molecular frame onto the strong-field-ionization and rescattering process underlying LIED and have developed theoretical approaches to describe these processes. Furthermore, we have demonstrated unprecedented degrees of field-free alignment of linear and asymmetric top molecules. In this second phase of the project, we will apply these advances for the investigation of chemical dynamics in small model systems, such as the dissociation of OCS, as well as the imaging of the dynamical interactions between molecular building blocks of life and water – the matrix of life.
This project is in strong collaboration with the group of Arnaud Rouzée at the MBI Berlin and the Max-Planck theory group of Angel Rubio at CFEL Hamburg.

A list of publications of the group is at https://www.controlled-molecule-imaging.org/publication/scientific and recent preprints are available at https://arxiv.org/find/physics/1/au:+Kupper_J/0/1/0/all/0/1

CFEL Controlled Molecule Imaging Group  —  https://www.controlled-molecule-imaging.org
Prof. Dr. Jochen Küpper

Center for Free-Electron Laser Science (CFEL)    Department of Physics & Department of Chemistry & Center for Ultrafast Imaging (CUI)
Deutsches Elektronen-Synchrotron DESY            Universität Hamburg
Photon Science – Coherent Imaging Division       Luruper Chaussee 149
Notkestrasse 85                                  22761 Hamburg
22607 Hamburg, Germany                           Germany

assistant: +49-40-8998-6457
phone:     +49-40-8998-6330
fax:       +49-40-8994-6330
mobile:    +49-40-899896330

Open positions  –  https://www.controlled-molecule-imaging.org/careers
CFEL Molecular Physics Seminar  –  https://www.molecular-physics.org/news/seminar
ERC COMOTION  –  https://www.comotion.info

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