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IOP Publishing, Journal of Physics B: Atomic, Molecular and Optical Physics, 24(53), p. 244012, 2020

DOI: 10.1088/1361-6455/abc660

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Time-resolved quantum beats in the fluorescence of helium resonantly excited by XUV radiation

Journal article published in 2020 by A. C. LaForge ORCID, A. Benediktovitch, V. Sukharnikov, Š. Krušič, M. Žitnik, M. Debatin, R. W. Falcone, J. D. Asmussen ORCID, M. Mudrich ORCID, R. Michiels ORCID, F. Stienkemeier ORCID, L. Badano, C. Callegari ORCID, M. Di Fraia, M. Ferianis and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Abstract We report on the observation of time-resolved quantum beats in the helium fluorescence from the transition 1s3p → 1s2s, where the initial state is excited by XUV free electron laser radiation. The quantum beats originate from the Zeeman splitting of the magnetic substates due to an external magnetic field. We perform a systematic study of this effect and discuss the possibilities of studying this phenomenon in the XUV and x-ray regime.