Frequency Metrology in Quantum Degenerate Helium: Direct Measurement of the 2 (3)S(1) -> 2 (1)S(0) Transition

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

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Precision spectroscopy of simple atomic systems has refined our understanding of the fundamental laws of quantum physics. In particular, helium spectroscopy has played a crucial role in describing two-electron interactions, determining the fine-structure constant and extracting the size of the helium nucleus. Here we present a measurement of the doubly forbidden 1557-nanometer transition connecting the two metastable states of helium (the lowest energy triplet state 2
Original languageEnglish
Pages (from-to)196--198
JournalScience
Volume333
Issue number6039
DOIs
Publication statusPublished - 2011

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