Hyperfine interaction effects on the (1s2p)3P1–(1s2s)1S0 energy splitting in He-like ions for parity nonconservation studiesThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at École de Physique, les Houches, France, 30 May – 4 June, 2010.

2011 ◽  
Vol 89 (1) ◽  
pp. 73-77 ◽  
Author(s):  
Fabrizio Ferro ◽  
Anton Artemyev ◽  
Andrey Surzhykov ◽  
Thomas Stöhlker
Keyword(s):  
Hyperfine Interaction ◽  
Hyperfine Structure ◽  
Nuclear Spin ◽  
Experimental Studies ◽  
Theoretical Knowledge ◽  
Energy Splitting ◽  
Parity Nonconservation ◽  
Opposite Parity ◽  
Atomic Systems ◽  
Dependent Part

Accurate theoretical knowledge of the (1s2p)3P1–(1s2s)1S0 splitting in He-like ions is demanded for future experimental studies of the nuclear spin-dependent part of the weak interaction. In this paper we perform a calculation of the hyperfine structure of (1s2p)3P1–(1s2s)1S0 within 3 ≤ Z ≤ 35, Z being the atomic number. In this Z range parity nonconservation (PNC) effects are amplified by the close energy proximity of the opposite parity levels (1s2p)3P1 and (1s2s)1S0. We find that the hyperfine structure is relevant for Z > 12, and produces splitting among the hyperfine sublevels as large as 150 meV for medium Z He-like ions (Z ∼ 35).

scholarly journals Hyperfine structure in the arc spectrum of cæsium and nuclear rotation

1928 ◽  
Vol 121 (787) ◽  
pp. 432-447 ◽  
Keyword(s):  
Hyperfine Structure ◽  
Nuclear Spin ◽  
High Frequency ◽  
Principal Series ◽  
Very High Frequency ◽  
Nuclear Rotation ◽  
Higher Temperature ◽  
The Difference ◽  
Mechanical Moment ◽  
Very High

The arc spectrum of cæsium was investigated with the object of finding whether any of its lines possessed hyperfine structure, resulting from a nuclear magnetic moment, due to a quantised nuclear spin. The lines belonging to the principal series should, owing to the greater degree of penetration of the electron in the (1 s or 6 1 ) orbit, and the correspondingly greater interaction, show the greatest effect. The lines of the principal series are very easily broadened if the vapour pressure of the metal becomes high, so that great care had to be used in obtaining the spectrum of cæsium at a sufficiently low temperature. The most satisfactory method of excitation was found to be the application by means of external electrodes of a very high frequency alternating current to a tube filled with helium at about 2 mm. pressure containing a small quantity of cæsium. The tube required slight heating to bring out the cæsium lines; without this the helium spectrum was very much stronger than the metallic spectrum. At a very low vapour pressures of cæsium the discharge was blue in colour. Under these conditions the lines of the principal series showed no broadening greater than that due to thermal agitation, but at a slightly higher temperature the colour of the discharge became purple and the lines broadened. The lines belonging to the principal series were found to be very close doublets with very nearly constant frequencies differences. A theory is worked out which explains the origin of these doublets, assuming a nuclear spin of one half quantum; by correlating the difference in the separation of the hyperfine structure doublets in the 1 s — m 2 p 3/2 lines and the 1 s — m 2 p 1/2 lines, it is shown that a ratio of the magnetic to the mechanical moment of the nucleus about twice as great as the corresponding ratio for the electron would account for the observed frequency differences. The spectral notation used throughout is that of Hund. The results are compared with those found for the hyperfine structure of some of the bismuth lines by Back and Goudsmid, and are found to be in satisfactory agreement. A selection principle is found which applies both to the bismuth and the cæsium spectrum.

STUDIES OF THE SPIN-HAMILTONIAN PARAMETERS AND OPTICAL SPECTRUM BAND POSITIONS FOR THE Yb3+ ION IN Tm3Al5O12 CRYSTALS

2009 ◽  
Vol 23 (20n21) ◽  
pp. 2457-2462 ◽  
Author(s):  
HONG-GANG LIU ◽  
WEN-CHEN ZHENG ◽  
WEN-LIN FENG ◽  
WEI-QING YANG
Keyword(s):  
Hyperfine Interaction ◽  
Hyperfine Structure ◽  
Matrix Method ◽  
Optical Spectrum ◽  
Spin Hamiltonian ◽  
Energy Matrix ◽  
Interaction Terms ◽  
Structure Constants ◽  
Spectrum Band ◽  
Hamiltonian Parameters

The spin-Hamiltonian parameters (g factors gi and hyperfine structure constants Ai, where i = x, y, z) and optical spectrum band positions of the Yb 3+ ion in the rhombically-distorted Tm 3+ site of Tm 3 Al 5 O 12 garnet crystal are calculated by a complete diagonalization (of the energy matrix) method, in which the Zeeman and hyperfine interaction terms are also included in the conventional Hamiltonian. From the calculations, the observed spin-Hamiltonian parameters of Tm 3 Al 5 O 12: Yb 3+ are explained reasonably and the optical spectrum band positions are suggested. The rationality of these suggested optical spectrum band positions is discussed by comparing them with the observed values of Yb 3+ ions in similar aluminum garnet ( Yb 3 Al 5 O 12, Y 3 Al 5 O 12 and Lu 3 Al 5 O 12) crystals.

scholarly journals Zero- and Nonzero-Nuclear-Spin Isotope Response in Resonantly Enhanced Multiphoton Ionization of Kr nd Xe With Broad Band Lasers

1993 ◽  
Vol 13 (2) ◽  
pp. 159-165
Author(s):  
D. Charalambidis ◽  
Y. L. Shao ◽  
S. D. Moustaizis ◽  
C. Fotakis
Keyword(s):  
Hyperfine Structure ◽  
Nuclear Spin ◽  
Intermediate State ◽  
Broad Band ◽  
Multiphoton Ionization ◽  
Mass Analysis ◽  
Experimental Conditions ◽  
Broadband Laser ◽  
Photon Ionization ◽  
Ionization Response

The abundance of the 83Kr isotope, determined by ion mass analysis following three photon resonant four photon ionization via the 5s’ [1/2]1 state with a broadband laser is found to differ from the expected natural value. This effect is discussed in terms of a change of the ionization response due to the decay of coherence in the intermediate state to its hyperfine structure coupling. The nonzero nuclear spin isotopes of Xe have not shown any effect of this type in three different ionization schemes under the present experimental conditions.

Nuclear Spin, Hyperfine Structure, and Nuclear Moments of 6.8-Day Lutetium-177

1962 ◽  
Vol 126 (1) ◽  
pp. 252-257 ◽  
Author(s):  
F. Russell Petersen ◽  
Howard A. Shugart
Keyword(s):  
Hyperfine Structure ◽  
Nuclear Spin ◽  
Nuclear Moments

THE MAGNETIC MOMENT OF INDIUM-115m

1962 ◽  
Vol 40 (8) ◽  
pp. 931-942 ◽  
Author(s):  
J. A. Cameron ◽  
H. J. King ◽  
H. K. Eastwood ◽  
R. G. Summers-Gill
Keyword(s):  
Magnetic Resonance ◽  
Hyperfine Interaction ◽  
Hyperfine Structure ◽  
Metastable State ◽  
Magnetic Moment ◽  
Atomic Beam ◽  
Electronic States ◽  
Nuclear Magnetic Moment ◽  
Hyperfine Anomaly ◽  
Nuclear Magnetic

The hyperfine structure of the 4.5-hour metastable state of indium-115 has been studied by the method of atomic beam magnetic resonance. The values found for the hyperfine interaction constants are −903.5 ± 1.1 and −95.973 ± 0.010 Mc/sec in the 2P1/2 and 2P3/2 electronic states respectively. Neglecting a possible hyperfine anomaly, these correspond to a nuclear magnetic moment for In115m of −0.24371 ± 0.00005 nuclear magnetons. The construction of the atomic beam apparatus, recently completed at McMaster University, is also described.

Analyse Rotationnelle de la Bande (0,0) du Système Orange de ScO

1972 ◽  
Vol 50 (4) ◽  
pp. 395-403 ◽  
Author(s):  
R. Stringat ◽  
C. Athénour ◽  
J. L. Féménias
Keyword(s):  
Excited State ◽  
Hyperfine Interaction ◽  
Hyperfine Structure ◽  
Liquid Nitrogen ◽  
Hollow Cathode ◽  
Ground State ◽  
Type B ◽  
Hollow Cathode Lamp ◽  
Magnetic Hyperfine Interaction ◽  
Coupling Case

The orange system of ScO has been reanalyzed as a 2Π → 2Σ transition. We have observed all the branches which are compatible with the selection rules ΔJ = 0, ± 1. We have not detected the hyperfine structure in the excited state, the coupling case being therefore aβ. The magnetic hyperfine interaction inducing the ground state doubling is the only one which appears; it has been analyzed by other authors who have shown that the coupling case for this state is of the type bβS.The use of an alloy hollow-cathode lamp, cooled with liquid nitrogen, has enabled us to improve the frequency measurements. The values of the constants have been obtained by a method by which, working directly with the Hamiltonian, the introduction of each parameter can be justified. The study of the Λ doubling in 2Π3/2 and 2Π1/2 levels leads us to values of ξ and η very close to those predicted for a pure precession case.

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