Speaker
Description
Radiative and non-radiative decay are both important de-excitation mechanisms of ions. To study these processes, collisions including ions in very high charge states (q ≥ 20) are an ideal playground: When close to a surface, resonant electron transfer leads to a population of high-n shells (with n ~ q [1]), initiating a de-excitation cascade of this - then neutral albeit still highly excited - projectile. X-ray emission is one of the de-excitation channels, however the measured yield drops with decreasing ion charge states [2,3]. To understand this behaviour it is crucial to consider also competing mechanisms, e.g., non-radiative Auger-like processes leading to the emission of electrons instead of photons.
We perform coincidence measurements to correlate the ion charge states after transmission through atomically thin samples [4] with electrons emitted during the interaction (energy and yield information) [5]. This allows us to disentangle de-excitation channels and identify participating processes in the neutralisation of highly charged ions upon interaction with a surface.
[1] J. Burgdörfer et. al., Phys. Rev. A, 44 5674 (1991)
[2] J. Schwestka et al., Nucl. Instrum. Methods Phys. Res. B 422 63 (2018)
[3] Ł. Jabłoński et al., J. Phys.: Conf. Ser. 1412 202002 (2020)
[4] A. Niggas et al. Commun. Phys., 4 180 (2021)
[5] A. Niggas et al. Phys. Rev. Lett., 129 086802 (2022)
| Presenting Author | Anna Niggas |
|---|---|
| Presenting Author Email Address | niggas@iap.tuwien.ac.at |
| Presenting Author Affiliation | TU Wien, Institute of Applied Physics |
| Country | Austria |
| Presenting Author Gender | Female |
