Imagen de Portada

Parts-per-million-accurate determination of the Kα photoionization resonance of Be-like oxygen with resolution of its 16O-18O isotopic shift

We determine with high accuracy the energy of the inner-shell transition 1⁢𝑠2⁢2⁢𝑠21𝑆0→1⁢𝑠⁢2⁢𝑠2⁢2⁢𝑝3/21𝑃1⁢16O4+𝐾⁢𝛼 at 554.372(3) eV (𝜆=22.36480⁢(12)⁢Å) as well as its small shift of 2.2±1.3 meV (Δ⁢𝜆=0.089⁢(52)⁢m⁢Å) for the 18O isotope. This transition blends with a 𝐾⁢𝛼 line of O5+ used in astrophys...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Danisch, Jonas (Autor) , Botz, Marc (Autor) , Shah, Chintan (Autor) , Togawa, Moto (Autor) , Goes, Joschka (Autor) , Hache, Dominic (Autor) , Grilo, Filipe (Autor) , Amaro, Pedro (Autor) , Yerokhin, Vladimir A. (Autor) , Kühn, Steffen (Autor) , Mohamed, Awad (Autor) , Totani, Roberta (Autor) , de Simone, Monica (Autor) , Orlando, Stefano (Autor) , Pfeifer, Thomas (Autor) , Nicastro, Fabrizio (Autor) , Coreno, Marcello (Autor) , Crespo López-Urrutia, José Ramon (Autor)
Formato: Article (Journal)
Lenguaje:inglés
Publicado: 12 February 2026
In: Physical review
Year: 2026, Volumen: 113, Número: 2, Pages: 1-10
ISSN:2469-9934
DOI:10.1103/d4h7-ykwn
Acceso en línea:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/d4h7-ykwn
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/d4h7-ykwn
Enlace del recurso
Notas de Autor:Jonas Danisch, Marc Botz, Chintan Shah, Moto Togawa, Joschka Goes, Dominic Hache, Filipe Grilo, Pedro Amaro, Vladimir A. Yerokhin, Steffen Kühn, Awad Mohamed, Roberta Totani, Monica de Simone, Stefano Orlando, Thomas Pfeifer, Fabrizio Nicastro, Marcello Coreno, and José R. Crespo López-Urrutia
Descripción
Sumario:We determine with high accuracy the energy of the inner-shell transition 1⁢𝑠2⁢2⁢𝑠21𝑆0→1⁢𝑠⁢2⁢𝑠2⁢2⁢𝑝3/21𝑃1⁢16O4+𝐾⁢𝛼 at 554.372(3) eV (𝜆=22.36480⁢(12)⁢Å) as well as its small shift of 2.2±1.3 meV (Δ⁢𝜆=0.089⁢(52)⁢m⁢Å) for the 18O isotope. This transition blends with a 𝐾⁢𝛼 line of O5+ used in astrophysical diagnostics, potentially affecting its reliability. In contrast to our experimental uncertainty of ±3 meV, advanced electronic structure predictions for this four-electron system, including quantum electrodynamic (QED) corrections on the order of 100 meV, still scatter by more than ±250 meV. Ions generated and stored in an electron beam ion trap were excited at the ELETTRA synchrotron facility with monochromatic soft x rays, with photon energies corrected by an additional spectrometer. Upon resonant excitation of O4+ and their subsequent autoionization, we separate the photoions of each isotope by a time-of-flight measurement. This way, we resolve soft x-ray isotopic shifts of a few meV, obtain very accurate data on essential astrophysical ions, and test calculations down to the level of QED contributions.
Notas:Veröffentlicht: 12. Februar 2026
Gesehen am 14.04.2026
Im Titel sind die Zahlen "16" und "18" hochgestellt
Descripción Física:Online Resource
ISSN:2469-9934
DOI:10.1103/d4h7-ykwn

Ejemplares similares