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Conferences > IQEC > 1994 > QTuP > QTuP4
  • International Quantum Electronics Conference
  • OSA Technical Digest (Optica Publishing Group, 1994),
  • paper QTuP4

Laser excitation of the 4He and 3He 1′S–2′P resonance lines at 58.4 nm

K. S. E. Eikema, W. Ubachs, W. Vassen, and W. Hogervorst

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Abstract

Recently we reported the first laser spectroscopic measurement of the transition frequency of the 58.4 nm resonance line of 4He,1 resulting in accurate values for the binding energy and the Lamb shift for its ground state. In contrast to the extensively investigated hydrogen atom, the Lamb shift in helium also contains a two-electron contribution. This shift is an order of magnitude larger in the ground state than in excited stales of He.

© 1994 Optical Society of America

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