The DOI matches its Crossref record; 16 of the 16 references it cites were found in a registry or an index.
Improved Measurement of the Hydrogen1S–2STransition Frequency
Open accessAbstract
We have measured the 1S-2S transition frequency in atomic hydrogen via two-photon spectroscopy on a 5.8 K atomic beam. We obtain f(1S-2S) = 2,466,061,413,187,035 (10) Hz for the hyperfine centroid, in agreement with, but 3.3 times better than the previous result [M. Fischer et al., Phys. Rev. Lett. 92, 230802 (2004)]. The improvement to a fractional frequency uncertainty of 4.2 × 10(-15) arises mainly from an improved stability of the spectroscopy laser, and a better determination of the main systematic uncertainties, namely, the second order Doppler and ac and dc Stark shifts. The probe laser frequency was phase coherently linked to the mobile cesium fountain clock FOM via a frequency comb.
Overview
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Integrity signals
Registry
Cites
Statistics
Verification
Claims the paper makes
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The self-check needs the paper’s full text.
Citations
Cites
CODATA recommended values of the fundamental physical constants: 2006
Mohr, P. J., Taylor, B. N., & Newell, D. B. (2008) · Reviews of Modern Physics · doi:10.1103/revmodphys.80.633 · Cited by 952
Niering, M., Holzwarth, R., Reichert, J., Pokasov, P., Udem, T., Weitz, M., Hänsch, T. W., Lemonde, P., Santarelli, G., Abgrall, M., et al. (2000) · Physical Review Letters · doi:10.1103/physrevlett.84.5496 · Cited by 560
Self-citationNew Limits on the Drift of Fundamental Constants from Laboratory Measurements
Fischer, M., Kolachevsky, N., Zimmermann, M., Holzwarth, R., Udem, T., Hänsch, T. W., Abgrall, M., Grünert, J., Maksimovic, I., Bize, S., et al. (2004) · Physical Review Letters · doi:10.1103/physrevlett.92.230802 · Cited by 431
Self-citationFrequency of the Hydrogen Maser
ESSEN, L., DONALDSON, R. W., BANGHAM, M. J., & HOPE, E. G. (1971) · Nature · doi:10.1038/229110a0 · Cited by 315
Farley, J. W., & Wing, W. H. (1981) · Physical Review A · doi:10.1103/physreva.23.2397 · Cited by 305
Alnis, J., Matveev, A., Kolachevsky, N., Udem, T., & Hänsch, T. W. (2008) · Physical Review A · doi:10.1103/physreva.77.053809 · Cited by 295
Self-citationConfinement of antihydrogen for 1,000 seconds
The ALPHA Collaboration (2011) · Nature Physics · doi:10.1038/nphys2025 · Cited by 272
Bize, S., Laurent, P., Abgrall, M., Marion, H., Maksimovic, I., Cacciapuoti, L., Grünert, J., Vian, C., dos Santos, F. P., Rosenbusch, P., et al. (2004) · Comptes Rendus Physique · doi:10.1016/j.crhy.2004.09.003 · Cited by 82
Self-citationHaas, M., Jentschura, U. D., Keitel, C. H., Kolachevsky, N., Herrmann, M. G., Fendel, P., Fischer, M., Udem, T., Holzwarth, R., Hänsch, T. W., et al. (2006) · Physical Review A · doi:10.1103/physreva.73.052501 · Cited by 81
Self-citationBloch, P., Pavlopoulos, P., & Klapisch, R. (1987) · Springer eBooks · doi:10.1007/978-1-4684-5389-8 · Cited by 71
Cited by
A 920-Kilometer Optical Fiber Link for Frequency Metrology at the 19th Decimal Place
Predehl, K., Grosche, G., Raupach, S. M. F., Droste, S., Terra, O., Alnis, J., Legero, T., Hänsch, T. W., Udem, T., Holzwarth, R., et al. (2012) · Science · doi:10.1126/science.1218442 · Cited by 543
Self-citationOptical-Frequency Transfer over a Single-Span 1840 km Fiber Link
Droste, S., Ozimek, F., Udem, T., Predehl, K., Hänsch, T. W., Schnatz, H., Grosche, G., & Holzwarth, R. (2013) · Physical Review Letters · doi:10.1103/physrevlett.111.110801 · Cited by 315
Self-citationMehlstäubler, T. E., Grosche, G., Lisdat, C., Schmidt, P. O., & Denker, H. (2018) · Reports on Progress in Physics · doi:10.1088/1361-6633/aab409 · Cited by 263
Transportable Optical Lattice Clock with 7 × 10 − 17 Uncertainty
Koller, S. B., Grotti, J., Vogt, S., Al-Masoudi, A., Dörscher, S., Häfner, S., Sterr, U., & Lisdat, C. (2017) · Physical Review Letters · doi:10.1103/physrevlett.118.073601 · Cited by 238
Observation of the 1S–2S transition in trapped antihydrogen
Ahmadi, M., Alves, B. X. R., Baker, C. J., Bertsche, W., Butler, E., Capra, A., Carruth, C., Cesar, C. L., Charlton, M., Cohen, S., et al. (2017) · Nature · doi:10.1038/nature21040 · Cited by 162
Metadata
- Authors
- Parthey, C. G., Matveev, A., Alnis, J., Bernhardt, B., Beyer, A., Holzwarth, R., Maistrou, A., Pohl, R., Predehl, K., Udem, T., Wilken, T., Kolachevsky, N., Abgrall, M., Rovera, D., Salomon, C., Laurent, P., & Hänsch, T. W.
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2011-11-11
- Volume
- 107
- Issue
- 20
- Pages
- 203001-203001
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W2150210656
- Cited by
- 423
- References
- 16
- FWCI
- 15.29
- Type
- journal article
- Language
- en
- Open access
- green
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review
How to cite
Cite CoChat for the checks on this page, and the paper for its own findings.
- This page
- CoChat. (2026). Citation check: Improved Measurement of the Hydrogen1S–2STransition Frequency. https://app.cochat.ai/papers/10.1103/physrevlett.107.203001
- The paper
- Parthey, C. G., Matveev, A., Alnis, J., Bernhardt, B., Beyer, A., Holzwarth, R., Maistrou, A., Pohl, R., Predehl, K., Udem, T., Wilken, T., Kolachevsky, N., Abgrall, M., Rovera, D., Salomon, C., Laurent, P., & Hänsch, T. W. (2011). Improved Measurement of the Hydrogen1S–2STransition Frequency. Physical Review Letters. https://doi.org/10.1103/physrevlett.107.203001
Data sources
Bibliographic data: Semantic Scholar, OpenAlex, Crossref.
Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
