SMuK 2023 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 74: Poster
HK 74.26: Poster
Donnerstag, 23. März 2023, 17:30–19:00, HSZ EG
Background-Corrected Collinear Saturation Spectroscopy at COALA — •Julien Spahn, Phillip Imgram, Kristian König, Patrick Müller, and Wilfried Nörtershäuser — Institut für Kernphysik, TU Darmstadt
All-optical determinations of nuclear charge radii in He-like systems will come into reach with increasing accuracy in atomic structure calculations of He-like systems. To this end, the 1s2s 3S1 → 1s2p 3PJ transitions in He-like 12C4+ and 13C4+ were measured at the Collinear Apparatus for Laser Spectroscopy and Applied Physics (COALA) at the Institute of Nuclear Physics of TU Darmstadt. The C4+ ions are produced with an electron-beam ion source (EBIS) and collinear/anticollinear laser spectroscopy was performed using Doppler tuning.
Variations in the background signal, caused by fluctuations in the collinear laser beam position, significantly contributed to the uncertainty of the measured transition frequencies, especially at high dwell times. Additionally, the residual Doppler broadening is still rather large compared to the natural linewidth of the transitions due to the initial energy spread of the ions inside the EBIS. This contribution will present and compare the improvements obtained by implementing a laser-beam position stabilization system and a voltage modulation of the fluorescence detection region. Moreover, a first attempt of background-corrected collinear saturation spectroscopy – a method that allows to overcome the limitations imposed by the residual Doppler broadening – will be presented.
This project is supported by DFG (Project-ID 279384907 - SFB 1245).