Köln 2025 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 2: Structure and Dynamics of Nuclei II

HK 2.2: Talk

Monday, March 10, 2025, 15:30–15:45, HS 3 Physik

Implementation of a Charge Exchange Cell for Collinear Laser Spectroscopy — •Imke Lopp, Kristian König, Julian Palmes, and Wilfried Nörtershäuser — Institut für Kerphysik, TU Darmstadt, Germany

Collinear Laser Spectroscopy is a high precision technique to record atomic spectra, from which the charge radius and nuclear moments can be extracted. For this purpose an atom or ion beam is superimposed with a laser beam. While ions can easily be accelerated and formed into a beam, their transitions are not always accessible with common laser systems – often it is easier to perform spectroscopy on neutral atoms. To still benefit from the advantages of collinear laser spectroscopy, a charge exchange cell, that neutralises the ion beam before the laser interaction, was newly installed at the Collinear Apparatus for Laser Spectroscopy and Applied Science (COALA) at TU Darmstadt. The very first atomic spectra at COALA were recorded using a strontium beam. The evaluation of these spectra and the resulting isotopic shifts, as well as the application of high-precision techniques enabled by the charge exchange cell – such as state-selective charge exchange measurements and background-free spectroscopy – will be presented, with the examples of strontium and phosphorus.

This project is supported by BMBF (05P24RD8) and the German Research Foundation (Project-ID: 279384907 - SFB 1245).

Keywords: Collinear Laser Spectroscopy; Charge Exchange