We report tests of local position invariance and the variation of fundamental constants from measurements of the frequency ratio of the 282-nm Hg-199(+) optical clock transition to the ground state hyperfine splitting in Cs-133. Analysis of the frequency ratio of the two clocks, extending over 6 yr at NIST, is used to place a limit on its fractional variation of < 5.8x10(-6) per change in normalized solar gravitational potential. The same frequency ratio is also used to obtain 20-fold improvement over previous limits on the fractional variation of the fine structure constant of vertical bar alpha/alpha vertical bar < 1.3x10(-16) yr(-1), assuming invariance of other fundamental constants. Comparisons of our results with those previously reported for the absolute optical frequency measurements in H and Yb-171(+) vs other Cs-133 standards yield a coupled constraint of -1.5x10(-15)<alpha/alpha < 0.4x10(-15) yr(-1) and -2.7x10(-15)< d/dt ln mu(Cs)/mu(B) < 8.6x10(-15) yr(-1).

Precision Atomic Spectroscopy for Improved Limits on Variation of the Fine Structure Constant and Local Position Invariance / T. M., Fortier; N., Ashby; J. C., Bergquist; M. J., Delaney; S. A., Diddams; T. P., Heavner; L., Hollberg; W. M., Itano; S. R., Jefferts; K., Kim; Levi, Filippo; Lorini, Luca; W. H., Oskay; T. E., Parker; J., Shirley; J. E., Stalnaker. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 98 (7):(2007), pp. 070801-1-070801-4. [10.1103/PhysRevLett.98.070801]

Precision Atomic Spectroscopy for Improved Limits on Variation of the Fine Structure Constant and Local Position Invariance

LEVI, FILIPPO;LORINI, LUCA;
2007

Abstract

We report tests of local position invariance and the variation of fundamental constants from measurements of the frequency ratio of the 282-nm Hg-199(+) optical clock transition to the ground state hyperfine splitting in Cs-133. Analysis of the frequency ratio of the two clocks, extending over 6 yr at NIST, is used to place a limit on its fractional variation of < 5.8x10(-6) per change in normalized solar gravitational potential. The same frequency ratio is also used to obtain 20-fold improvement over previous limits on the fractional variation of the fine structure constant of vertical bar alpha/alpha vertical bar < 1.3x10(-16) yr(-1), assuming invariance of other fundamental constants. Comparisons of our results with those previously reported for the absolute optical frequency measurements in H and Yb-171(+) vs other Cs-133 standards yield a coupled constraint of -1.5x10(-15)
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11696/34454
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 215
  • ???jsp.display-item.citation.isi??? 188
social impact