Hanle effect for lifetime determinations in the soft x-ray regime
By exciting a series of 1𝑠2 1𝑆0→1𝑠𝑛𝑝1𝑃1 transitions in heliumlike nitrogen ions with linearly polarized monochromatic soft x rays at the Elettra facility, we found a change in the angular distribution of the fluorescence sensitive to the principal quantum number 𝑛. In particular it is observed...
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| Main Authors: | , , , , , , , , , , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
16 October, 2024
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| In: |
Physical review letters
Year: 2024, Volume: 133, Issue: 16, Pages: 1-7 |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.133.163202 |
| Online Access: | Verlag, kostenfrei, Volltext: https://doi.org/10.1103/PhysRevLett.133.163202 Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.133.163202 
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| Author Notes: | Moto Togawa, Jan Richter, Chintan Shah, Marc Botz, Joshua Nenninger, Jonas Danisch, Joschka Goes, Steffen Kühn, Pedro Amaro, Awad Mohamed, Yuki Amano, Stefano Orlando, Roberta Totani, Monica de Simone, Stephan Fritzsche, Thomas Pfeifer, Marcello Coreno, Andrey Surzhykov, and José R. Crespo López-Urrutia |
MARC
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| 520 | |a By exciting a series of 12 10→111 transitions in heliumlike nitrogen ions with linearly polarized monochromatic soft x rays at the Elettra facility, we found a change in the angular distribution of the fluorescence sensitive to the principal quantum number . In particular it is observed that the ratio of emission in directions parallel and perpendicular to the polarization of incident radiation increases with higher . We find this dependence to be a manifestation of the Hanle effect, which served as a practical tool for lifetime determinations of optical transitions since its discovery in 1924. In contrast to traditional Hanle effect experiments, in which one varies the magnetic field and considers a particular excited state, we demonstrate a “soft x-ray Hanle effect” which arises in a static magnetic field but for a series of excited states. By comparing experimental data with theoretical predictions, we were able to determine lifetimes ranging from hundreds of femtoseconds to tens of picoseconds of the 111 levels, which find excellent agreement with atomic-structure calculations. We argue that dedicated soft x-ray measurements could yield lifetime data that are beyond current experimental reach and cannot yet be predicted with sufficient accuracy. | ||
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