Abstract
Abstract
We report direct measurements of the frequency ratio of the 642 THz
S
1
/
2
2
(
F
=
0
)
–
F
7
/
2
2
(
F
=
3
)
electric octupole transition in 171Yb+ and the 429 THz
S
0
1
–
P
0
3
transition in 87Sr. A series of 107 measurements has been performed at the Physikalisch-Technische Bundesanstalt between December 2012 and October 2019. Long-term variations of the ratio are larger than expected from the individual measurement uncertainties of few 10−17. The cause of these variations remains unknown. Even taking these into account, we find a fractional uncertainty of the frequency ratio of 2.5 × 10−17, which improves upon previous knowledge by one order of magnitude. The average frequency ratio is
ν
Y
b
+
/
ν
S
r
=
1.495
991
618
544
900
537
(
38
)
. This represents one of the most accurate measurements between two different atomic species to date.
Funder
Deutsche Forschungsgemeinschaft
Horizon 2020 Framework Programme
Cited by
26 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献