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MS: Fachverband Massenspektrometrie

MS 5: Poster

MS 5.12: Poster

Mittwoch, 4. März 2026, 17:00–19:00, Philo 1. OG

Determination of the size of the neutral particle cloud in rL-SNMS — •Jonah Böttger, Paul Hanemann, Manuel Raiwa, Aaron Lehnert, and Clemens Walther — Leibniz University Hannover, IRS, Hannover, Germany

After the installation of resonant Laser Secondary Neutral Mass Spectrometry (rL-SNMS), a combination of TOF-SIMS and laser system, the size of the neutral particle cloud was only estimated through simulations. [1]

Using two different methods we were able to measure the size of the cloud. First, by scanning it with a resonant laser, producing a two-dimensional map of the number of neutral particles. Second, by measuring saturation curves for uranium, plutonium and americium with different laser beam diameters to determine an upper limit for the size of the neutral particle cloud. Possible differences in the size of the cloud for different elements and isotopes were also investigated.

The cloud was determined to be spherical with a diameter of around 300 - 400 µm with only minimal differences between elements and isotopes. Both methods came to similar results, experimentally confirming the earlier simulations. Using this, we were able to optimize the overlap of the laser beams and the neutral particle cloud, increasing the sensitivity of the system by a factor of 4.

[1] DOI: 10.1016/j.ijms.2017.10.003

Keywords: rL-SNMS; RIMS; TOF-SIMS; radionuclides; laser