Lamb shift measurement in the1t1S ground state of helium
نویسندگان
چکیده
منابع مشابه
Lamb shift measurement in the 1 1 S ground state of helium
With a phase-modulated extreme ultraviolet pulsed laser source the frequency of the 1 S-2 P transition of helium at 58 nm has been measured. The phase modulation scheme enabled measurement and reduction of frequency chirp, usually limiting pulsed precision spectroscopy. From the measured transition frequency of 5 130 495 083~45! MHz, a fourfold improved value of the ground state Lamb shift of 4...
متن کاملPrecision measurements in helium at 58 nm: Ground state lamb shift and the 1 S-2 P transition isotope shift.
A source of narrow bandwidth (,800 MHz) tunable laser radiation at 58.4 nm has been developed and is applied to record the 11S-21P transition in He and He. From the He transition frequency of 171 134.8936s58d cm21 a fivefold improved ground state Lamb shift of 1.3763s58d cm21 is deduced, in good agreement with the theoretical value of 1.3755s10d cm21. The measured 11S-21P transition isotope shi...
متن کاملLamb Shift in Muonic Helium Ion
The Lamb shift (2P1/2 − 2S1/2) in the muonic helium ion (μ 2He) is calculated with the account of contributions of orders α3, α4, α5 and α6. Special attention is given to corrections of the electron vacuum polarization, the nuclear structure and recoil effects. The obtained numerical value of the Lamb shift 1381.716 meV can be considered as a reliable estimate for the comparison with experiment...
متن کاملMeasurement of the He Ground State Lamb Shift via the Two - Photon 1 1 S - 2 1 S Transition
We have extended two-photon Doppler-free spectroscopy to the vacuum ultraviolet spectral region, to accurately measure the He 11S-21S transition at 120 nm. Our result is 4 984 872 315(48) MHz. This yields a ground state Lamb shift of 41 104(48) MHz, in fair agreement with theory and other experiments. This approach has the potential for significantly better accuracy once improvements in the las...
متن کاملRipplonic Lamb Shift for Electrons on Liquid Helium.
We study the shift of the energy levels of electrons on a helium surface due to the coupling to the quantum field of surface vibrations. As in quantum electrodynamics, the coupling is known, and it is known to lead to an ultraviolet divergence of the level shifts. We show that there are diverging terms of different nature and use the Bethe-type approach to show that they cancel each other, to l...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review A
سال: 1997
ISSN: 1050-2947,1094-1622
DOI: 10.1103/physreva.55.1866