The relativistic recoil effect has been the object of experimental investigations using highly charged ions at the Heidelberg electron beam ion trap. Its scaling with the nuclear charge Z boosts its contribution to a measurable level in the magnetic-dipole (M1) transitions of B- and Be-like Ar ions. The isotope shifts of 36Ar versus 40Ar have been detected with sub-ppm accuracy, and the recoil effect contribution was extracted from the 1s22s22p 2P1/2-2P3/2 transition in Ar13+ and the 1s22s2p 3P1-3P2 transition in Ar14+. The experimental isotope shifts of 0.00123(6) nm (Ar13+) and 0.00120(10) nm (Ar14+) are in agreement with our present predictions of 0.00123(5) nm (Ar13+) and 0.00122(5) nm (Ar14+) based on the total relativistic recoil operator, confirming that a thorough understanding of correlated relativistic electron dynamics is necessary even in a region of intermediate nuclear charges.
R. S. Orts and Z. Harman and J. R. Crespo Lopez-Urrutia and A. N. Artemyev and H. Bruhns and A. J. Gonzalez and U. D. Jentschura and C. H. Keitel and A. Lapierre and V. S. Mironov and V. M. Shabaev and H. Tawara and I. I. Tupitsyn and J. H. Ullrich and A. V. Volotka, "Exploring Relativistic Many-Body Recoil Effects in Highly Charged Ions," Physical Review Letters, vol. 97, no. 10, pp. 103002-1-103002-4, American Physical Society (APS), Sep 2006.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevLett.97.103002
Keywords and Phrases
Argon; Beryllium; Boron; Electron Beams; Isotopes; Magnetic Properties; Relativity; Electron Dynamics; Magnetic-dipole (M1) Transitions; Recoil Effects; Relativistic Recoil Operators; Ions
International Standard Serial Number (ISSN)
Article - Journal
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