News

Doctors defense of Felix Weber in 2023

On 28 Mar Felix Weber finished her PhD thesis titled

Towards Z=100 laser spectroscopy on atomic and nuclear structure in californium and einsteinium in the LARISSA group.

His thesis deals with laser spectroscopic investigations on the atomic and nuclear structure of the (on earth) purely artificially produced actinide elements californium (Z = 98) and einsteinium (Z = 99).

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Doctoral defense of Nina Kneip in 2022

On Oct 26, 2022, Nina Kneip finished her PhD thesis titled Resonance ionization mass spectrometry: Isotope enrichment of rare species and spectroscopy in actinides for ultra-trace analysis in the LARISSA group.

Her thesis focuses on the three prominent application areas of RIMS, i.e. the implantation of pure isotopes, ultra-trace analysis of rare radiotoxic isotopes and, finally, spectroscopic investigations of atomic and nuclear properties, in this work carried out on the five actinide elements uranium, neptunium, plutonium, americium and curium.

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Klaus Wendt awarded with the Robert-Wichard-Pohl-Award

The Robert-Wichard-Pohl-Award 2022, granted by the German Physical Society, goes to Klaus Wendt

"For his outstanding work in the field of atomic and nuclear physics and trace analysis, as well as for the development of laser systems that are now in use worldwide. In addition, with his engaging personality and enormous commitment, Klaus Wendt has inspired students and the public for physics and developed new concepts for the education of teachers and students."

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Applied Photonics Bad Honnef Physics School Poster Award

Poster award handed over by Prof. Dr. Neu.
Poster award handed over by Prof. Dr. Neu.

The Applied Photonics Bad Honnef Physics School, sponsored by the Wilhelm and Else Heraeus Foundation, specializes on advanced research topics in photonics. This time the focus was on photonics systems and application areas of laser technology in the industrial and scientific contexts, which were addressed in lectures and discussed through poster presentations by participants.

Nina Kneip presented her work on Laser spectroscopy and ultra-trace analysis on lighter actinides – from Uranium to Curium, and won the poster award sponsored by Zeiss https://www.appliedphotonics.de/poster-awards/.

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Innovative Training Network LISA launched

The international collaboration LISA (Laser Ionization and Spectroscopy of Actinide Elements), an Innovative Training Network including partners from all over the globe, started in early 2020. The project funds 15 early stage researchers over a period of 4 years. Read more

For the LARISSA group, Magdalena Kaja started her PhD project in October 2020.

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Missing atomic energy levels of Actinium detected

Generation of the 1337 nm wavelength by difference frequency mixing of 457 nm and 700 nm laser light.

The lowest-lying odd-parity energy levels of the atomic system of actinium have been predicted by theory for a long time, but were never experimentally observed. A team of scientists from the group of Prof. Budker at HIM and the LARISSA group finally revealed these "missing" lines in a laser spectroscopic experiment.

The extracted properties of the atomic transitions were compared to state-of-the-art atomic structure calculations and were found to be in perfect agreement. The collaboration of experimenalists and theorists from China, Germany, USA and Russia published the results in Physical Review Letters.

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Fundamental property of Earth’s rarest element measured

The GANDALPH beamline at CERN-ISOLDE

An international team of researchers succeeded in the measurement of the electron affinity of the all radioactive element astatine. The results are published in Nature communications.

The isotope 211At is a perfect candidate for targeted alpha therapy. The measured values of the electron affinity and the earlier measured ionization potential provide important stepping stones towards the development of chemical compounds for applications in radiopharmacy.

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Closing the last gap for the Periodic Table’s 150th birthday

Figure: PRA 99, 062513

Timely for the “International Year of the Periodic Table of Chemical Elements” which celebrates the 150th anniversary of Mendeleev's discovery of the periodic table, a European collaboration of chemists and physicists has published the first experimental determination of the ionization potential of the lanthanide element promethium, thus closing the last remaining gap for this fundamental atomic property in the Periodic Table.

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Präsentation auf der ARIS 2017

Vom 28. Mai bis zum 2. Juni findet in Keystone, Colorado die dritte „International Conference on Advances in Radioactive Isotope Science - ARIS 2017“ statt. Auf der Flagship-Konferenz des Gebiets der Untersuchung seltener Isotope stellen Vertreter der weltweit führenden Forschungseinrichtungen aktuelle Entwicklungen und Ergebnisse vor. Die Arbeitsgruppe LARISSA ist durch Reinhard Heinke vertreten und präsentiert die Aufrüstung der Ionenquelle LIST zur Anwendung für hochauflösende Spektroskopie und isomerenselektive Laserresonanzionisation an on-line-Isotopenseparatoren wie CERN-ISOLDE: „Towards On-line High-resolution In-source Laser Spectroscopy: A Perpendicular Laser – Atom Beam Upgrade for the LIST“. Die Posterpräsentation findet am Dienstag, den 30. Mai von 19 bis 21 Uhr statt.

Die vorangegangenen Arbeiten wurden in Kooperation mit dem Laserionenquellenteam von ISOLDE und Vertretern der Super-Heavy-Elements-Gruppe der GSI durchgeführt. Die Veröffentlichung der Ergebnisse ist in Vorbereitung.

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Neues Ti:Saphir-Laser Design im Einsatz

Neues Ti:Saphir-Laser Design im Einsatz
Photo: JYFL Accelerator News

Das in der AG LARISSA entwickelte Design der hochrepetierenden Titan:Saphir-Laser erhielt kürzlich ein umfassendes Update. Die neuste Generation dieser Laser wird inzwischen im Rahmen unserer internationalen Kollaborationen an verschiedenen On-line Einrichtungen eingesetzt. Ein Set an Lasern wird beim Low-Energy-Branch des MARA-Experiments an der Universität Jyväskylä (Finnland) Einsatz finden und helfen protonenreiche Radionuklide zu untersuchen.

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