dc.contributor.author |
Van Rooij, R |
en |
dc.contributor.author |
Borbely, JS |
en |
dc.contributor.author |
Simonet, J |
en |
dc.contributor.author |
Hoogerland, Maarten |
en |
dc.contributor.author |
Eikema, KSE |
en |
dc.contributor.author |
Rozendaal, RA |
en |
dc.contributor.author |
Vassen, W |
en |
dc.date.accessioned |
2012-05-23T21:30:30Z |
en |
dc.date.accessioned |
2012-11-19T00:12:30Z |
en |
dc.date.issued |
2011 |
en |
dc.identifier.citation |
Science 333(6039):196-198 2011 |
en |
dc.identifier.issn |
0036-8075 |
en |
dc.identifier.uri |
http://hdl.handle.net/2292/19667 |
en |
dc.description.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 3S1 and first excited singlet state 2 1S0), for which quantum electrodynamic and nuclear size effects are very strong. This transition is weaker by 14 orders of magnitude than the most predominantly measured transition in helium. Ultracold, submicrokelvin, fermionic 3He and bosonic 4He atoms are used to obtain a precision of 8 × 10−12, providing a stringent test of two-electron quantum electrodynamic theory and of nuclear few-body theory. |
en |
dc.publisher |
American Association for the Advancement of Science |
en |
dc.relation.ispartofseries |
Science |
en |
dc.relation.replaces |
http://hdl.handle.net/2292/18263 |
en |
dc.relation.replaces |
2292/18263 |
en |
dc.rights |
Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained from http://www.sherpa.ac.uk/romeo/issn/0036-8075/ |
en |
dc.rights.uri |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
en |
dc.title |
Frequency metrology in quantum degenerate helium: Direct measurement of the 2 3S 1 → 2 1S 0 transition |
en |
dc.type |
Journal Article |
en |
dc.identifier.doi |
10.1126/science.1205163 |
en |
pubs.issue |
6039 |
en |
pubs.begin-page |
196 |
en |
pubs.volume |
333 |
en |
dc.identifier.pmid |
21737737 |
en |
pubs.end-page |
198 |
en |
dc.rights.accessrights |
http://purl.org/eprint/accessRights/RestrictedAccess |
en |
pubs.subtype |
Article |
en |
pubs.elements-id |
210421 |
en |
pubs.org-id |
Science |
en |
pubs.org-id |
Physics |
en |
pubs.arxiv-id |
1105.4974 |
en |
dc.identifier.eissn |
1095-9203 |
en |
pubs.record-created-at-source-date |
2012-05-24 |
en |
pubs.dimensions-id |
21737737 |
en |