S. Porsev

Publications151
h-index30
Citations2,747
Highly Influential Citations66
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Multipolar theory of blackbody radiation shift of atomic energy levels and its implications for optical lattice clocks
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… Expand
Blackbody-radiation shift in the Sr optical atomic clock
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… Expand
Trapping of neutral mercury atoms and prospects for optical lattice clocks.
TLDR
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. Expand
Hyperfine quenching of the metastable 3 P 0,2 states in divalent atoms
Hyperfine quenching rates of the lowest-energy metastable 3 P 0 and 3 P 2 states of Mg, Ca, Sr, and Yb atoms are computed. The calculations are carried out using ab initio relativistic many-body… Expand
Precision determination of electroweak coupling from atomic parity violation and implications for particle physics.
TLDR
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. Expand
A new approach for testing variations of fundamental constants over cosmic epochs using FIR fine-structure lines
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… Expand
ELECTRIC-DIPOLE AMPLITUDES, LIFETIMES, AND POLARIZABILITIES OF THE LOW-LYING LEVELS OF ATOMIC YTTERBIUM
Centre for Optics and Atomic Physics, Sussex University, Falmer, Brighton BN1 9QH, United Kingdom~Received 2 March 1999!The results of ab initio calculations of electric-dipole amplitudes, lifetimes,… Expand
Proposed experimental method to determine alpha sensitivity of splitting between ground and 7.6 eV isomeric states in 229Th.
TLDR
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. Expand
Transition frequency shifts with fine-structure-constant variation for Fe II: Breit and core-valence correlation corrections
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… Expand
Transition frequency shifts with fine-structure constant variation for Fe I and isotope-shift calculations in Fe I and Fe II
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… Expand
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