Sommersemester 2021URL to ICS calendar of this seminar
Kirchhoff-Institut für Physik, Otto-Haxel-Hörsaal
Kolloquium der 46. Heidelberger Graduiertentage - Hans Jensen Invited Lecture
Chemical exchange processes play an important role for various molecular systems with cavities. Insights into the underlying thermodynamics, kinetics, and structure parameters are important for the design of synthetic molecules employed for example for binding of greenhouse gases or for the characterization of hydrophobic pockets in naturally occurring proteins. This talk will give an overview how 129
Xe is an ideal “spy” to explore such cavities. The nuclear spin of this inert gas reveals hidden states of different molecular symmetry that affect exchange kinetics. more...
Nuclear fusion could contribute to the energy mix in the second half of this century. For a fusion reactor, matter has to be heated up to extremely high temperatures: more than 100 million degrees - about a factor of 10 hotter than the sun's core. At these temperatures, the material is fully ionized. The charged particles can be confined by magnetic fields, which are also able to provide the required efficient heat insulation. There are two promising magnetic confinement concepts: tokamak and stellarator. more...
Highly charged ions (HCI) have many favorable properties for tests of fundamental physics and as potential next-generation optical atomic frequency standards . For example, narrow optical fine-structure transitions have smaller polarizabilities and electric quadrupole moments, but much stronger relativistic, QED and nuclear size contributions to their binding energy compared to their (near) neutral counterparts. Therefore, HCI have been found to be among the most sensitive atomic species to probe for a possible variation of the fine-structure constant or dark matter coupling. more...
The experimental platform of atoms manipulated by light offers answers to a broad spectrum of open questions. With three explicit and very different examples I will give you glimpse how broad this spectrum is. One fundamental question in oceanography is the time when deep water in the ocean was last in exchange with the atmosphere. The possibility to detect Argon 39 atoms one by one allows the dating of water samples as small as ten liters. A very different question in physics is the generation of spatially separated entanglement in atomic gases. more...
Prof. Dr. Johan Rockström, Director of the Potsdam Institute for Climate Impact Research and Professor in Earth System Science at the University of Potsdam
Rising human pressures on the planet during the Great Acceleration phase from the 1950s onwards, has pushed the Earth system into a new geological Epoch, the Anthropocene. This is the age of the human enterprise, where our modern economy triggers impacts that exceed, in both pace and scale, the natural variations, stresses and shocks from Earth's orbit around the Sun, volcanic eruptions, and Earthquakes. Today, science is forced to consider the real risk of us, the modern world, destabilising the entire planet, potentially pushing the Earth system away from its equilibrium state, the Holocene, that has been the prerequisite for the development of modern human civilisations since we left the last Ice Age some 12,000 years ago. more...
Gemeinsames Kolloquium mit dem KIT, organisiert vom KIT