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Cingöz A, Lapierre A, Nguyen AT, et al. Limit on the temporal variation of the fine-structure constant using atomic dysprosium. Phys Rev Lett. 2007;98(4):040801doi: 10.1103/PhysRevLett.98.040801.
Cingöz, A., Lapierre, A., Nguyen, A. T., Leefer, N., Budker, D., Lamoreaux, S. K., & Torgerson, J. R. (2007). Limit on the temporal variation of the fine-structure constant using atomic dysprosium. Physical review letters, 98(4), 040801. https://doi.org/10.1103/PhysRevLett.98.040801
Cingöz, A, et al. "Limit on the temporal variation of the fine-structure constant using atomic dysprosium." Physical review letters vol. 98,4 (2007): 040801. doi: https://doi.org/10.1103/PhysRevLett.98.040801
Cingöz A, Lapierre A, Nguyen AT, Leefer N, Budker D, Lamoreaux SK, Torgerson JR. Limit on the temporal variation of the fine-structure constant using atomic dysprosium. Phys Rev Lett. 2007 Jan 26;98(4):040801. doi: 10.1103/PhysRevLett.98.040801. Epub 2007 Jan 26. PMID: 17358752.
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Phys Rev Lett. 2007 Jan 26;98(4):040801. doi: 10.1103/PhysRevLett.98.040801. Epub 2007 Jan 26.

Limit on the temporal variation of the fine-structure constant using atomic dysprosium.

Physical review letters

A Cingöz, A Lapierre, A-T Nguyen, N Leefer, D Budker, S K Lamoreaux, J R Torgerson

Affiliations

  1. Department of Physics, University of California at Berkeley, Berkeley, California 94720-7300, USA.

PMID: 17358752 DOI: 10.1103/PhysRevLett.98.040801

Abstract

Over 8 months, we monitored transition frequencies between nearly degenerate, opposite-parity levels in two isotopes of atomic dysprosium (Dy). These frequencies are sensitive to variation of the fine-structure constant (alpha) due to relativistic corrections of opposite sign for the opposite-parity levels. In this unique system, in contrast to atomic-clock comparisons, the difference of the electronic energies of the opposite-parity levels can be monitored directly utilizing a rf electric-dipole transition between them. Our measurements show that the frequency variation of the 3.1-MHz transition in (163)Dy and the 235-MHz transition in (162)Dy are 9.0+/-6.7 Hz/yr and -0.6+/-6.5 Hz/yr, respectively. These results provide a rate of fractional variation of alpha of (-2.7+/-2.6) x 10(-15) yr(-1) (1 sigma) without assumptions on constancy of other fundamental constants, indicating absence of significant variation at the present level of sensitivity.

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