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1
Content available remote

Precise Measurements of the Hyperfine Structure of the Levels Belonging to the Terms 3d^{5}4s ^{5}G and ^{5}P in Cr(I)

100%
Krzykowski A., Głowacki P., Jarosz A.
Acta Physica Polonica A
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2012
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vol. 122
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issue 1
78-81
EN
The hyperfine structure intervals for the electronic levels belonging to the terms 3 d^5 (^4G) 4s a^5G and a^5P of a chromium 53 atom were precisely measured with the use of the method of atomic beam magnetic resonance detected by laser induced resonance fluorescence. Magnetic-dipole and electric-quadrupole hyperfine interaction constants (A and B, respectively) for the electronic levels of interest were determined with the accuracy of a few kHz. The high precision of measurements also enabled an estimation of the octupole-coupling constants (C).
2
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Anisotropy of g_{eff} Factor for Ni_{50}Mn_{35.5}In_{14.5} Heusler Alloy

51%
Dubiel Ł., Wal A., Stefaniuk I.
Acta Physica Polonica A
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2017
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vol. 132
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issue 1
91-93
EN
In this work electron magnetic resonance (EMR) spectra of off-stoichiometric Ni_{50}Mn_{35.5}In_{14.5} Heusler alloy ribbons obtained by melt-spinning method were measured. The EMR measurements were performed on the X-band (9.36 GHz) spectrometer. Angle dependences were registered for three orientations of sample, with the use of uniaxial goniometer at 300. The results exhibited magnetic anisotropy and were used for calculating the principal values of g tensor.
3
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NIST Cesium Fountains - Current Status and Future Prospects

44%
Jefferts S., Heavner T., Parker T., Shirley J.
Acta Physica Polonica A
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2007
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vol. 112
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issue 5
759-767
EN
We review the current status of the U.S. Primary Frequency Standard, NIST-F1. NIST-F1 is a laser-cooled cesium fountain based frequency standard with an inaccuracy of less thanδ f/f<5×10^{-16}; limited mainly by the radiation field in the room-temperature fountain (blackbody shift). NIST-F1 is one of the best cesium fountains currently contributing to international atomic time, but has reached a point that it is impractical to improve its accuracy substantially. Therefore we are building a new fountain, imaginatively named NIST-F2, with a cryogenic (77 K) Ramsey interrogation zone that lowers the blackbody shift by several orders of magnitude. NIST-F2 is currently undergoing final assembly, and we will discuss our planned (hoped for) performance, which includes frequency inaccuracy ofδ f/f<1×10^{-16}.
4
Content available remote

Entropy Associated with Local Stabilization of the Pulse Area in Multilevel Atomic Media

44%
Alhasan A.
Acta Physica Polonica A
|
2018
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vol. 133
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issue 5
1205-1214
EN
This paper provides an entropy analysis to resonant and short pulses propagation in four-level atomic medium. As an example, we take D_{1} transition in rubidium ^{87}Rb atoms including hyperfine structure. We show how to construct the time dependent Bloch-metric for each optical transition in the Liouville space. Furthermore, we attempt to relate local stabilization of the pulse area to the distribution of the space-entropy.
5
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Hyperfine structure operator in the tensorial form of second quantization

38%
Gaigalas G., Rudzikas Z., Scharf O.
Open Physics
|
2004
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vol. 2
|
issue 4
720-736
EN
The general tensorial form of the hyperfine interaction operator in the formalism of second quantization is presented. Both diagonal and off-diagnonal matrix elements of the above-mentioned operator are found using an approach based on a combination of second quantization in the coupled tensorial form, angular momentum theory in three spaces (orbital, spin and quasispin) and a generalised graphical technique. This methodology allows us to account for correlation effects efficiently and, therefore, to study the hyperfine interactions in complex many-electron atoms, those with openf-shells included, in a practical manner. All this will lead us to design an efficient program for large scale calculations of hyperfine structure and isotope shift.
6
Content available remote

EPR Study of Gamma Irradiated Cholestanone Single Crystal

26%
Caliskan B.
Acta Physica Polonica A
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2014
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vol. 125
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issue 1
135-138
EN
Cholestanone (C_{27}H_{46}O) single crystals were irradiated with ^{60}Co-γ rays at room temperature. The spectra were recorded for different orientations of the crystal in the magnetic field at 120 K using the EPR technique. Radiation damage center was attributed to ĊHCH_2 CH_2 radical. The principal values of the hyperfine coupling tensor of the unpaired electron with the protons and the principal values of the g tensor were determined. The results were found to be in good agreement with the existing literature.
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