We are offering following position:
The research group of Prof. Tobias LAU is looking for a phD student who is interested in the project:
X-ray magnetic circular dichroism of state-controlled transition elements
About the project:
Ion mobility mass spectrometry or electronic state chromatography, combined with gas-discharge ion sources, is an ideal tool to select ions of 3d transition elements in ground or excited electronic states that are not necessarily linked by dipole-allowed or one-electron transitions. Here, ion mobility mass spectrometry and cryogenic ion trapping with our ion trap endstation at BESSY II will be employed to prepare cold and electronic state-selected ions of 3d transition elements for x-ray spectroscopy. Ionization of transition elements in a gas discharge produces ground and excited state electronic configurations that are separated by the mobility analyser. A cryogenic ion trap will be used to accumulate and cool the ions, and serves as the interaction region with X-ray photons. For a given element, ground states, as well as long-lived excited states that differ in 3d electron configuration, will be of particular interest for high-resolution X-ray absorption and X-ray linear dichroism spectra in order to fundamentally test XMCD sum rules, and will give a library of experimental XAS and XMCD data that are important for computational developments in high-level theory for X-ray absorption spectroscopy. Changes in transition metal L-edge excitation energy with 3d electron configuration will also contribute to a fundamental understanding of the empiric concept of oxidation states. First steps towards state or isomer-selective X-ray spectroscopy of larger ions will be made. The work program will consist of an initial phase of laboratory work to prepare transitions metal ions in well-defined electronic states, followed by campaigns at the BESSY II synchrotron radiation facility for X-ray absorption and XMCD spectroscopy.
(T. Lau, B. von Issendorff)
About RTG DynCAM:
The RTG DynCAm program comprises a series of complementary experimental and theoretical projects, investigating and controlling the electron and nuclear dynamics down to the quantum level. In the focus are advanced techniques for the preparation of controlled atomic, molecular and cluster ensembles, combined with modern ultra-short laser techniques, as well as a variety of theory approaches. Collaborations with UBC offer an international environment with opportunities for extended research stays in Vancouver, Canada.
We are looking for highly motivated, enthusiastic, and team-oriented candidates that are eager to learn new methods, are passionate about science, and hold a master’s degree or equivalent in physics, chemistry, or related areas.
Please send your application as a single pdf-file including a letter of motivation, a CV, certificates of your university degree (including grades), a transcript of records and contact details of two references to our coordinator Simone Ortolf: firstname.lastname@example.org
The duration of contracts within the RTG is 36 months and the salary corresponds to TV-L E13 (75%) and is typically higher than 1.950€ per month (after tax) depending on qualification and family status. This also includes health insurance and social benefits according to the German labor law.
The University of Freiburg seeks to increase the number of female scientific faculty members and therefore strongly encourages qualified women to apply for the position. The university committed to provide a family-friendly workplace. In case of equal qualification, persons with disabilities will be given preference.