English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

New measurements of high-lying even parity $6sns\, {}^1 \! S_0$ and$6snd\,{}^{3,1}\!D_2$ levels of neutral $^{174}$Yb are presented in this paper.Spectroscopy is performed by a two-step laser excitation from the ground state$4f^{14}6s^2 \, {}^1 \! S_0$, and the Rydberg levels are detected by using thefield ionization method. Additional two-photon microwave spectroscopy is usedto improve the relative energy accuracy where possible. The spectroscopicmeasurements are complemented by a multichannel quantum defect theory (MQDT)analysis for the J=0 and the two-coupled J=2 even parity series. We compare ourresults with the previous analysis of Aymar {\it{et al}} \cite{Aymar_1980} andanalyze the observed differences. From the new MQDT models, a revised value forthe first ionization limit $I_{6s}=50443.07041(25)$ cm$^{-1}$ is proposed.

Laser and microwave spectroscopy of even-parity Rydberg states of neutral ytterbium and Multichannel Quantum Defect Theory analysis