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Conferences > IQEC > 2011 > PMFT > I1142
  • Proceedings of the International Quantum Electronics Conference and Conference on Lasers and Electro-Optics Pacific Rim 2011
  • (Optica Publishing Group, 2011),
  • paper I1142

Frequency metrology in quantum degenerate helium

R. van Rooij, J. S. Borbely, J. Simonet, M. D. Hoogerland, K. S. E. Eikema, R. A. Rozendaal, and W. Vassen

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Abstract

We report the first direct observation and high precision measurement of the triplet to singlet transition between the metastable states of helium. We obtain a precision of 8×10−12, providing a stringent test of two-electron quantum electrodynamic theory and of nuclear few-body theory.

We use either the 4He or the 3He isotope, and from the isotope shift derive a new value for the 3He charge radius.

© 2011 AOS

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