Details
| Original language | English |
|---|---|
| Article number | 163202 |
| Number of pages | 7 |
| Journal | Physical review letters |
| Volume | 133 |
| Issue number | 16 |
| Publication status | Published - 16 Oct 2024 |
Abstract
By exciting a series of 1s2 S01→1snpP11 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 that the ratio of emission in directions parallel and perpendicular to the polarization of incident radiation increases with higher n. We find this n 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 1snpP11 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.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- General Physics and Astronomy
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In: Physical review letters, Vol. 133, No. 16, 163202, 16.10.2024.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Hanle Effect for Lifetime Determinations in the Soft X-Ray Regime
AU - Togawa, Moto
AU - Richter, Jan
AU - Shah, Chintan
AU - Botz, Marc
AU - Nenninger, Joshua
AU - Danisch, Jonas
AU - Goes, Joschka
AU - Kühn, Steffen
AU - Amaro, Pedro
AU - Mohamed, Awad
AU - Amano, Yuki
AU - Orlando, Stefano
AU - Totani, Roberta
AU - De Simone, Monica
AU - Fritzsche, Stephan
AU - Pfeifer, Thomas
AU - Coreno, Marcello
AU - Surzhykov, Andrey
AU - López-Urrutia, José R.Crespo
N1 - Publisher Copyright: © 2024 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by the Max Planck Society.
PY - 2024/10/16
Y1 - 2024/10/16
N2 - By exciting a series of 1s2 S01→1snpP11 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 that the ratio of emission in directions parallel and perpendicular to the polarization of incident radiation increases with higher n. We find this n 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 1snpP11 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.
AB - By exciting a series of 1s2 S01→1snpP11 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 that the ratio of emission in directions parallel and perpendicular to the polarization of incident radiation increases with higher n. We find this n 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 1snpP11 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.
UR - http://www.scopus.com/inward/record.url?scp=85206917974&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.133.163202
DO - 10.1103/PhysRevLett.133.163202
M3 - Article
C2 - 39485972
AN - SCOPUS:85206917974
VL - 133
JO - Physical review letters
JF - Physical review letters
SN - 0031-9007
IS - 16
M1 - 163202
ER -