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The Femtosecond Dynamics group is looking for a highly motivated Master student for a thesis at the ultrafast microscope. Together with PhD student DI Robert Schwarzl, the student will investigate the light--matter interaction of squaraine-based molecular crystals. In particular, the so-far unobserved dynamics of Frenkel excitons and charge-transfer excitons on their intrinsic time- and length scale are of interest. The state-o-the-art setup will achieve (sub-) micrometer spatial and femtosecond temporal resolution. These technologically important molecular crystals are promising for photovoltaic applications, bio-markers and sensors as they can be efficiently excited in the NIR-VIS spectrum. Compensation: 2640 € Contact: Assoc.Prof. Markus Koch markus.kochnoSpam@tugraz.at
Project start: May 2022 - as soon as possible
Within the FWF START project ELFIS – Electronic Fingerprint Spectroscopy – we examine different molecular species of earth atmospheric relevance by means of visible and near ultraviolet absorption spectroscopy with unprecedented spectral resolution. This allows a detailed analysis of photoinduced chemical reactions like the ones that are triggered by our sun in the atmosphere (e.g. the reaction cycles including nitrous oxides and ozon). The high spectral resolution is enabled by using a novel spectroscopy method called dual comb spectroscopy. It is the combination of two stabilized femtosecond laser sources that are typically emitting in the near infrared region. In order to transfer the radiation into the visible and near ultraviolet, nonlinear processes of frequency up conversion are necessary - and with that high pulse energies are a prerequisite. The goal of this master project is the development of a unique high power fiber amplifier system delivering those highly energetic laser pulses. First spectroscopic experiments in nitrous dioxde, formaldehyde and ammonia will prove its capabilities.
Compensation: 2640 € Contact: Assoc. Prof. Birgitta Schultze-Bernhardt
Contact: bernhardtnoSpam@tugraz.at
The aim of this project is to study the surface structure of the transition-metal dichalcogenide (TMDC) TaS2 with helium atom scattering. TaS2 has a particularly rich phase diagram involving several charge-density wave (CDW) transitions driven by strong electronic correlations and electron-phonon coupling upon changes of the surface temperature. Helium scattering measurements at different sample temperatures should allow to follow the phase transitions and the changes upon the surface structure / charge density with temperature.
Compensation: € 2640 Contact: tamtoeglnoSpam@tugraz.at
More information
For studies of the adsorption of gas molecules on various material surfaces, so-called Dirac materials, the setup of a gas dosing system is necessary. Therefore, an existing experimental apparatus should be extended with a setup for the dosage of gases. To deliver gas adsorbates onto the surface in a controlled and quantitative way, a gas-handling system with a microcapillary array beam will be designed and constructed. The master student will be responsible for design and setup of the gas dosing system with help provided by our group and should then run first adsorption tests on Dirac material surfaces.
Real-time electronic structure theory, a challenging, yet comparably less advanced subfield of computational chemistry, has gained substantially in interest in recent years due to experimental breakthroughs in the field of ultrafast spectroscopy on the atto- and femtosecond timescale. The theory aims for a realistic description and simulation of electron dynamics, by evolving either the Schrödinger equation or the Dirac equation in cases where relativistic effects become relevant.
By now, for almost all standard methods of computational chemistry there exists a time-dependent (TD) counterpart, for density- as well as wavefunction based methods, although of varying computational practicability and numerical accuracy. In the course of this master thesis, an atomic orbital-based ansatz within the real-time electronic propagation formulation will be applied to the Schrödinger equation for the electronic many-body problem. Starting from a well-known TD-Hartree-Fock framework, it is our goal to implement a cost-efficient TD-Configuration Interaction method based on the Python programming language. Somewhat challenging, but surely exciting as well ;)
Only basic programming skills in Python are required, but advanced knowledge would be highly appreciated. It is highly recommended for the candidate to participate in the lecture "Modelling of Molecular Systems" which will be held in the winter semester. Please get in contact via mail if interested. FWF funding might be available in Summer 2023, but can not be guaranteed yet.
Contact: Ass. Prof. Andreas Hauser andreas.hausernoSpam@tugraz.at
the development of a prototype of a novel optical vector magnetometer by utilising the coherent population trapping phenomenon in the atomic vapour of rubidium. The prototype is based on our scalar magnetometer, the Coupled Dark State Magnetometer. This device was especially designed for scientific space missions and is already on-board of 4 scientific satellites and will be launched to Jupiter in April of 2023.
will include the implementation of a new laser diode and laser current source for the laboratory setup of the Magnetometer Lab at the Institute of Experimental Physics. This setup will be used for the characterisation of the vector magnetometer prototype. This testing will be performed at the Institute of Experimental Physics of TU Graz, the Space Research Institute of the Austrian Academy of Sciences (located in Graz) as well as the Geomagnetic Conrad Observatory of Geosphere Austria.
for a motivated Master student, who is interested in joining our team.
Contact: Christoph Amtmann (christoph.amtmannnoSpam@tugraz.at) or
Roland Lammegger (roland.lammeggernoSpam@tugraz.at)
Institut für Experimentalphysik Technische Universität Graz Petersgasse 16 8010 Graz Austria schultzenoSpam@tugraz.at wolfgang.ernstnoSpam@tugraz.at andreas.hausernoSpam@tugraz.at markus.kochnoSpam@tugraz.at tamtoeglnoSpam@tugraz.at bernhardtnoSpam@tugraz.at