Cascade-free Doppler-tuned precision measurement of the lifetime of the 23S1state in He-like niobium(93Nb39+)

Autor:	P. Charles, Keith Finlayson, D. D. Dietrich, B. B. Birkett, Paul Indelicato, Richard Marrus, Alexandre Simionovici
Rok vydání:	1994
Předmět:	Physics chemistry Cascade Niobium Order (ring theory) chemistry.chemical_element Sensitivity (control systems) Atomic physics Spectroscopy Hyperfine structure Atomic and Molecular Physics and Optics Charged particle Ion
Zdroj:	Physical Review A. 49:3553-3556
ISSN:	1094-1622 1050-2947
DOI:	10.1103/physreva.49.3553
Popis:	The lifetime of the 2 $^{3}$${\mathit{S}}_{1}$ state in He-like niobium (${\mathrm{Nb}}^{39+}$) has been precisely determined with a beam-foil time-of-flight technique. The isotope $^{93}\mathrm{Nb}$ (I=9/2) was chosen in order to minimize cascade effects through hyperfine quenching of the primary feeding state. Further precision was obtained by removing blends with a Doppler-tuned transmission filter. Other cascade contributions were analyzed and found to be negligible. The result is 45.45(16)\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}12}$ sec and respresents increased sensitivity to corrections of O(Z\ensuremath{\alpha}${)}^{2}$ in the Z\ensuremath{\alpha}-series expansion for the lifetime by a factor of 5.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::fc695d7db1d9fb1131cdb7e20855ced4 https://doi.org/10.1103/physreva.49.3553 Zobrazit plný text záznamu