排序方式: 共有16条查询结果,搜索用时 31 毫秒
1.
Volotka AV Glazov DA Andreev OV Shabaev VM Tupitsyn II Plunien G 《Physical review letters》2012,108(7):073001
A rigorous evaluation of the two-photon exchange corrections to the hyperfine structure in lithiumlike heavy ions is presented. As a result, the theoretical accuracy of the specific difference between the hyperfine splitting values of H- and Li-like Bi ions is significantly improved. This opens a possibility for the stringent test of the many-electron QED effects on a few percent level in the strongest electromagnetic field presently available in experiments. 相似文献
2.
J. Rothhardt M. Bilal R. Beerwerth A.V. Volotka V. Hilbert T. Stöhlker S. Fritzsche J. Limpert 《X射线光谱测定》2020,49(1):165-168
We propose to measure the lifetime of short-lived excited states in highly charged ions by pump-probe experiments. Utilizing two synchronized and delayed Femtosecond pulses allows accessing these lifetimes with Femtosecond precision. Such measurements could provide sensitive tests of state-of-the art atomic structure calculations beyond the capabilities of established methods. 相似文献
3.
V. A. Agababaev D. A. Glazov A. V. Volotka D. V. Zinenko V. M. Shabaev G. Plunien 《X射线光谱测定》2020,49(1):143-148
Theoretical g-factor calculations for the first excited 2P3/2 state of boronlike ions in the range Z=10–20 are presented and compared with the previously published values. The first-order interelectronic-interaction contribution is evaluated within the rigorous quantum electrodynamics (QED) approach in the effective screening potential. The second-order contribution is considered within the Breit approximation. The QED and nuclear recoil corrections are also taken into account. 相似文献
4.
Lapierre A Jentschura UD Crespo López-Urrutia JR Braun J Brenner G Bruhns H Fischer D González Martínez AJ Harman Z Johnson WR Keitel CH Mironov V Osborne CJ Sikler G Soria Orts R Shabaev V Tawara H Tupitsyn II Ullrich J Volotka A 《Physical review letters》2005,95(18):183001
The lifetime of the Ar13+ 1s(2)2s(2)2p2p0(3/2) metastable level was determined at the Heidelberg Electron Beam Ion Trap to be 9.573(4)(5). The accuracy level of one per thousand makes this measurement sensitive to quantum electrodynamic effects like the electron anomalous magnetic moment (EAMM) and to relativistic electron-electron correlation effects like the frequency-dependent Breit interaction. Theoretical predictions, adjusted for the EAMM, cluster about a lifetime that is approximately shorter than our experimental result. 相似文献
5.
D. Solovyev L. Labzowsky A. Volotka G. Plunien 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2011,61(2):297-304
The sum rule for the transition rates between the components of two multiplets,
known for the one-photon transitions, is extended to the multiphoton transitions
in hydrogen and hydrogen-like ions. As an example the transitions 3p–2p, 4p–3p
and 4d–3d are considered. The numerical results are compared with previous
calculations. 相似文献
6.
R Nirmala V Sankaranarayanan K Sethupathi AV Morozkin T Geethakumary Y Hariharan 《Pramana》2002,58(5-6):1101-1104
New R
2Ti3Ge4 (R=Dy, Ho and Er) intermetallic compounds have been synthesized and characterized by X-ray diffraction and low temperature ac
magnetic susceptibility, electrical resistivity and thermoelectric power measurements were carried out. The compounds crystallize
in the parent, Sm5Ge4-type orthorhombic structure (space group Pnma) and lanthanide contraction is observed as one moves along the rare-earth series.
The changeover from paramagnetic to antiferromagnetic phase happens at low temperatures and the ordering temperature scales
with the de Gennes factor. The electrical resistivity is metallic with a negative curvature above 100 K. Thermopower displays
a weak maximum at temperatures less than 50 K signifying the possible phonon and magnon drag effects. 相似文献
7.
N. S. Oreshkina A. V. Volotka D. A. Glazov I. I. Tupitsyn V. M. Shabaev G. Plunien 《Optics and Spectroscopy》2007,102(6):815-818
The hyperfine structure of the ground state of the lithium-like scandium ion (Z = 21) is considered. The effects of electron-electron interaction are taken into account in the first order in 1/Z using the quantum electrodynamic perturbation theory and in higher orders using the method of configuration interaction in the Dirac-Fock-Sturm basis. One-loop radiative corrections are calculated in all orders in αZ with an effective local screening potential. The corrections for the finite nuclear size and the distribution of the magnetic moment over the nucleus have been refined. 相似文献
8.
Orts RS Harman Z López-Urrutia JR Artemyev AN Bruhns H Martínez AJ Jentschura UD Keitel CH Lapierre A Mironov V Shabaev VM Tawara H Tupitsyn II Ullrich J Volotka AV 《Physical review letters》2006,97(10):103002
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 1s(2)2s(2)2p 2P(1/2) - 2P(3/2) transition in Ar13+ and the 1s(2)2s2p 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. 相似文献
9.
The ground-state hyperfine splitting values of high-Z boronlike ions are calculated. Calculation of the interelectronic-interaction contribution is based on a combination of the 1/Z perturbation theory and the large-scale configuration-interaction Dirac-Fock-Sturm method. The screened QED corrections are evaluated utilizing an effective screening potential approach. Total hyperfine splitting energies are presented for several B-like ions of particular interest: 45Sc16+, 57Fe21+, 207Pb77+, and 209Bi78+. For lead and bismuth the experimental values of the 1s hyperfine splitting are employed to improve significantly the theoretical results by reducing the uncertainty due to the nuclear effects. 相似文献
10.
A. V. Volotka D. A. Glazov G. Plunien V. M. Shabaev I. I. Tupitsyn 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2006,38(2):293-298
The one-electron quantum-electrodynamic corrections to the
magnetic-dipole transition amplitude
between the fine-structure
levels (1s2 2s2 2p) 2P3/2 - 2P1/2 in boronlike ions
are calculated to all orders in αZ. The results obtained
serve for improving the theoretical accuracy of the lifetime of the
(1s2 2s2 2p) 2P3/2 level in boronlike argon. 相似文献