Welcome to COMB.AT – a Special Research Area funded by the FWF, DFG and co-financed by the participating research institutions that aims to improve precision measurements of physical constants in optical metrology! COMB.AT is short for “Coherent Optical Metrology Beyond Electric-Dipole-Allowed Transitions”.

We bring scientists from four different academic institutions together to establish a systematic theoretical and experimental approach to study the advantages and limitations of the interaction of light that carries topological charges with matter. In particular, we aim to look at transitions in carbon-monosulfide (CS) molecules and the 229Th nucleus. These formally dipole-forbidden transitions have not yet been excited by lasers and are therefore an especially fascinating topic for research! Our collaborative approach at COMB.AT ensures that diverse perspectives and expertise come together to achieve remarkable advancements.

Join us in this journey towards metrological excellence. By working with light that carries orbital angular momentum we will lay the groundwork for new applications in spectroscopy and for the manipulation of molecules.

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If you would like to learn more about the physics behind our research, about Special Research Programs in general, or why this topic is of such big interest to scientists, we invite you to browse in our “About” section. Keep your eyes peeled for news about upcoming events, where we love to share our passion for physics!

Interested academics, industry partners, and other experts can find out more details about our consortium and projects under “Research Groups” or take a look at our publications, conferences, or press releases in the “Impact” section.

For members of our Special Research Program, we have additional information on programs or workshops that might be of interest to you, as well as extra benefits or support from your institution, like sports activities or childcare possibilities. Find out more under “Information for SFB members”.

You are interested in joining our team of researchers in this trailblazing project? Take a look at our “Career” section, where we post any open positions in our research groups. We are looking forward to having your bright mind on our team!

 News

04.12.2025 14:45
 

Gianluca Galzerano from the Istituto di Fotonica e Nanotecnologie, Politecnico di Milano is giving a talk on “Solid-State Frequency Combs with...

31.10.2025
 

We are pleased to share that Prof. Thorsten Schumm and his teams research have recently been featured in two major Austrian newspapers, highlighting...

20.10.2025
 

The paper "Fine-structure constant sensitivity of the Th-229 nuclear clock transition" is now published in Nature Communications.

We want to...

17.10.2025 10:00
 

Andrey Surzhykov from the PTB Braunschweig will hold a talk as part of the SFB Colloquium on Friday, 17th of October at 10 AM in the Helmut Rauch...

03.10.2025
 

Last week, we held our very first SFB Symposium, and we couldn’t be happier with how the three days unfolded. The event was filled with plenty of...

16.09.2025 11:00
 

Samuel Kresch from the University of California, Santa Barbara is giving a talk on “Inelastic Recoil Spectroscopy: Rotationally Resolved Spectroscopy...