Spectroscopic nuclear quadrupole moments

Pyykkö, Pekka

doi:10.1080/00268970110069010

Cited by 526 publications

(409 citation statements)

References 116 publications

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“…4). 45,161 Quadrupolar products, P Q , of 0.5-0.8 MHz were observed for 'basic' Na 8 1 . Studies of mixed Cl/Br and Br/I sodalite systems yielded quadrupolar products of 0.3-0.7 MHz (Cl/Br system) and 0.3-1.0 MHz (Cl/I system).…”

Section: Bromine-79/81mentioning

confidence: 96%

“…Chlorine-35 quadrupolar products were found to be very small, P Q D 0.2 š 0.1 MHz, and constant regardless of the percentage Cl in mixed Cl/Br and Cl/I samples (over the range 5-100%). A more precise value (P Q D 55 š 5 kHz) for pure chloro-sodalite, Na 8 35 Cl MAS NMR spectrum due to nearest-neighbor interactions with such electrons. 34 A hyperfine coupling constant of A 0 D 85 kHz was determined.…”

Section: Chlorine-35/37mentioning

confidence: 98%

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Solid-state NMR spectroscopy of the quadrupolar halogens: chlorine-35/37, bromine-79/81, and iodine-127

Bryce

Sward

2006

Magn. Reson. Chem.

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Section: Bromine-79/81mentioning

confidence: 96%

Section: Chlorine-35/37mentioning

confidence: 98%

Solid-state NMR spectroscopy of the quadrupolar halogens: chlorine-35/37, bromine-79/81, and iodine-127

Bryce

Sward

2006

Magn. Reson. Chem.

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“…1 This method is based on the calculation of electric field gradient ͑EFG͒ values for a certain number of molecules that are further combined with experimental nuclear quadrupole coupling constants ͑NQCCs͒, obtained from microwave spectroscopy, to yield the NQMs for the desired nucleus. High accuracy can be achieved for the NQMs derived in such a way depending on the quality of the EFG calculations and the errors of experimental NQCCs.…”

Section: Introductionmentioning

confidence: 99%

The nuclear electric quadrupole moment of antimony from the molecular method

Haiduke

Silva

Visscher

2006

The Journal of Chemical Physics

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Relativistic Dirac-Coulomb ͑DC͒ Hartree-Fock calculations are employed to obtain the analytic electric field gradient ͑EFG͒ on the antimony nucleus in the SbN, SbP, SbF, and SbCl molecules. The electronic correlation contribution to the EFGs is included with the DC-CCSD͑T͒ and DC-CCSD-T approaches, also in the four-component framework, using a finite-difference method. The total EFG results, along with the experimental nuclear quadrupole coupling constants from microwave spectroscopy, allow to derive the nuclear quadrupole moments of 121 Sb and 123 Sb, respectively, as −543͑11͒ and −692͑14͒ mb.

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“…The lowering of the 5=2 À level from N ¼ 40 to N ¼ 50 is reproduced by both interactions, but the spin inversion at N ¼ 50 is predicted correctly only by the jj44b interaction, which also shows a better overall agreement in the trend. With JUN45 the 5=2 À level is systematically at too low energies and the inversion between the 3=2 À and 5=2 À levels already occurs in 79 Ga. Table III shows the moments extracted from the hfs coefficients using the known magnetic moment [32] and quadrupole moment [33] …”

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confidence: 99%

Nuclear Spins and Moments of Ga Isotopes Reveal Sudden Structural Changes betweenN=40andN=50

et al. 2010

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Collinear laser spectroscopy was performed on Ga (Z ¼ 31) isotopes at ISOLDE, CERN. A gas-filled linear Paul trap (ISCOOL) was used to extend measurements towards very neutron-rich isotopes (N ¼ 36-50 Nuclear structure has for some time been described by the single-particle (SP) states of nucleons in the shell model. The evolution and reordering of these levels along isotopic chains is explored at radioactive ion beam facilities to provide information on the nature of the nucleonnucleon interaction. Key to these studies is the determination of the value of the nuclear spin of each state, which provides a means of level identification. Whereas the spin may sometimes be inferred from nuclear decay and -spectroscopy data, laser spectroscopy [1,2] permits a measurement of the nuclear spin, in addition to the state's magnetic dipole and electric quadrupole moments. The latter two observables are very sensitive to the wave function and thus to the SP shell evolution. The sensitivity of the laser technique has been critically enhanced using bunched beams from a gas-filled linear rf quadrupole known as an ion beam cooler [3]. In this Letter we report the application of ISCOOL [4]-an ion beam cooler recently installed at ISOLDE-for collinear laser spectroscopy on Ga isotopes from stable to the magic N ¼ 50 shell gap, located 15 isotopes away from stability. For the first time g.s. spins have been measured, revealing sudden changes not observed in earlier experiments.The Ga isotopes have three protons outside the Z ¼ 28 shell gap. In a normal shell-model ordering, the three protons would occupy the p 3=2 level, leading to a g.s. spin I ¼ 3=2 for all odd-A Ga isotopes. However, in the Cu isotones with two protons fewer, it has been demonstrated that the proton SP ordering changes when neutrons start occupying the g 9=2 orbital around N ¼ 40 [5][6][7][8][9][10][11][12][13][14][15]. An inversion of the p 3=2 and f 5=2 SP levels was established recently in 75 Cu at N ¼ 46 [11], where the 5=2 À g.s. is near degenerate with a 3=2 À and 1=2 À state [11]. In this Letter we establish the g.s. spins and structure of the odd-A Ga isotopes from N ¼ 36 up to the N ¼ 50 shell closure, and we investigate the systematics of the 1=2 À , 3=2 À and 5=2 À levels.Fission fragments were produced in a thick UC x target (45 g=cm 2 ) using 1.4 GeV protons at an average current of $2 A. A proton-neutron converter [16] was used to suppress the Rb production. The Ga yield was selectively enhanced by a factor of 100 using the Resonant Ionization Laser-Ion Source [17], extracted and accelerated to 30 keV and mass selected. The ions were cooled and bunched by the newly-installed ISCOOL [4] and delivered to the collinear laser spectroscopy setup [18]. The ion beam was

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Spectroscopic nuclear quadrupole moments

Cited by 526 publications

References 116 publications

Solid-state NMR spectroscopy of the quadrupolar halogens: chlorine-35/37, bromine-79/81, and iodine-127

Solid-state NMR spectroscopy of the quadrupolar halogens: chlorine-35/37, bromine-79/81, and iodine-127

The nuclear electric quadrupole moment of antimony from the molecular method

Nuclear Spins and Moments of Ga Isotopes Reveal Sudden Structural Changes betweenN=40andN=50

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