Multipolar theory of blackbody radiation shift of atomic energy levels and its implications for optical lattice clocks
- S. Porsev, A. Derevianko
- Physics
- 13 February 2006
Blackbody radiation (BBR) shifts of the {sup 3}P{sub 0}-{sup 1}S{sub 0} clock transition in the divalent atoms Mg, Ca, Sr, and Yb are evaluated. The dominant electric-dipole contributions are…
Precision determination of electroweak coupling from atomic parity violation and implications for particle physics.
- S. Porsev, K. Beloy, A. Derevianko
- PhysicsPhysical Review Letters
- 2 February 2009
This is the most accurate to-date test of the low-energy electroweak sector of the SM and increases the lower limit on the masses of extra Z bosons predicted by models of grand unification and string theories.
Trapping of neutral mercury atoms and prospects for optical lattice clocks.
- H. Hachisu, K. Miyagishi, H. Katori
- PhysicsPhysical Review Letters
- 29 November 2007
Hg is the heaviest nonradioactive atom trapped so far, which enables sensitive atomic searches for "new physics" beyond the standard model and an accurate optical lattice clock based on Hg is proposed and evaluated to be better than 10;{-18.
Blackbody-radiation shift in the Sr optical atomic clock
- M. Safronova, S. Porsev, U. Safronova, M. Kozlov, C. Clark
- Physics, Materials Science
- 26 October 2012
We evaluated the static and dynamic polarizabilities of the $5{s}^{2}\phantom{\rule{0.16em}{0ex}}{}^{1}{S}_{0}$ and $5s5p\phantom{\rule{0.16em}{0ex}}{}^{3}{P}_{0}^{o}$ states of Sr using the…
Proposed experimental method to determine alpha sensitivity of splitting between ground and 7.6 eV isomeric states in 229Th.
- J. Berengut, V. Dzuba, V. Flambaum, S. Porsev
- PhysicsPhysical Review Letters
- 11 March 2009
Measurements of the differences of atomic transition frequencies between thorium atoms (or ions) with the nucleus in the ground state and in the first excited (isomeric) state are proposed to enable extraction of the change in nuclear charge radius and electric-quadrupole moment between the isomers, and hence the alpha dependence of the isomeric transition frequency with reasonable accuracy.
A new approach for testing variations of fundamental constants over cosmic epochs using FIR fine-structure lines
- S. Levshakov, D. Reimers, M. Kozlov, S. Porsev, P. Molaro
- Physics, Chemistry
- 18 December 2007
Aims. We aim to obtain limits on the variation of the fine-structure constant α and the electron-to-proton mass ratio μ over different cosmological epochs. Methods. A new approach based on the…
Alkaline-Earth Atoms in Optical Tweezers
- A. Cooper, J. Covey, Ivaylo S. Madjarov, S. Porsev, M. Safronova, M. Endres
- PhysicsPhysical Review X
- 15 October 2018
We demonstrate single-shot imaging and narrow-line cooling of individual alkaline earth atoms in optical tweezers; specifically, strontium-88 atoms trapped in $515.2~\text{nm}$ light. We achieve…
Transition frequency shifts with fine-structure constant variation for Fe I and isotope-shift calculations in Fe I and Fe II
- S. Porsev, M. Kozlov, D. Reimers
- Physics
- 10 March 2009
In this paper we calculated the relativistic corrections to transition frequencies (q factors) of Fe I for the transitions from the even- and odd-parity states to the ground state. We also carried…
Transition frequency shifts with fine-structure-constant variation for Fe II: Breit and core-valence correlation corrections
- S. Porsev, K. Koshelev, I. Tupitsyn, M. Kozlov, D. Reimers, S. Levshakov
- Physics
- 13 August 2007
Transition frequencies of Fe II ion are known to be very sensitive to variation of the fine-structure constant $\ensuremath{\alpha}$. The resonance absorption lines of Fe II from objects at…
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