High-Precision Spectroscopy of the Forbidden 23S1 → 21P1 Transition in Quantum Degenerate Metastable Helium

被引：29
作者：
Notermans, R. P. M. J. W. [1 ]
Vassen, W. [1 ]
机构：
[1] Vrije Univ Amsterdam, Dept Phys & Astron, LaserLaB, NL-1081 HV Amsterdam, Netherlands
来源：
PHYSICAL REVIEW LETTERS | 2014年 / 112卷 / 25期
关键词：
MUONIC HYDROGEN; ATOMIC HELIUM; LAMB-SHIFT; HE-4; I; FREQUENCY; METROLOGY; STATES; GASES; RATES;
D O I：
10.1103/PhysRevLett.112.253002
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We have measured the forbidden 2 S-3(1) -> 2 P-1(1) transition at 887 nm in a quantum degenerate gas of metastable He-4 atoms confined in an optical dipole trap. The determined transition frequency is 338 133 594.4 (0.5) MHz, from which we obtain an ionization energy of the 2 P-1(1) state of 814 709 148.6 (0.5) MHz. This ionization energy is in disagreement by > 3 sigma with the most accurate quantum electrodynamics calculations available. Our measurements also provide a new determination of the lifetime of the 2 P-1(1) state of 0.551 (0.004)(stat) ((+0.013)(-0.000))(syst) ns, which is the most accurate determination to date and in excellent agreement with theory.
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