A Table of Nuclear Moments, January 1950

Mack, J. E.

doi:10.1103/revmodphys.22.64

Cited by 232 publications

(29 citation statements)

References 292 publications

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“…14 The above value of the ratio of these two moments fixes a value of 2.8X 10~2 4 cm 2 for Re 185 from that of the Re 187 . Kopfermann 15 has suggested an approximate proportionality of the deviation, 5jtt, of magnetic dipole moments from the Schmidt limits and the electric quadrupole moments in pairs of isotopes of the same spin differing by two neutrons.…”

Section: Spectrum Of Re0 3 CLmentioning

confidence: 85%

Microwave Absorption Spectra of MnO3F and ReO3Cl

Javan

Engelbrecht

1954

Phys. Rev.

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The microwave spectra of M11O3F and ReOsCl near 1-cm wavelength have been studied. From the spectra of the first molecule and its isotopic species Mn(0 16 )20 18 F, the structural parameters were determined as:Mn-F=1.724A, / (O, Mn, F) =» 108°27'. The nuclear quadrupole coupling constant of Mn 55 was measured as eqQ-16.8 Mc/sec. Because of the spin and statistics of O 16 nuclei not all of the rotational states are allowed. It was found that, whereas in the ground vibrational states only states with K a multiple of three are permissible, in the excited vibrational states of the perpendicular normal modes the states with K-l a multiple of three can occur. For K=l = ±1 appreciable /-type doubling was observed. The amounts of I doubling and their corresponding values of a v were determined for MnOsF. The molecular dipole moment of this molecule was found to be /z= 1.5 Debye units. The hyperfine structure of ReOsCl gives for the ratio of quadrupole moments of the two abundant isotopes of Re a value of Qne^/Qne^-1.067±0.045 and for the quadrupole coupling constant of Re 187 , eqQ=253 Mc/sec. This coupling constant and the known optical value of the quadrupole moment of Re 187give some information about the electronic structure of the molecular bonds, from which an approximate value of the nuclear quadrupole moment of Mn 55 was obtained as Q=0.55X10~~2 4 cm 2 .

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Section: Spectrum Of Re0 3 CLmentioning

confidence: 85%

Microwave Absorption Spectra of MnO3F and ReO3Cl

Javan

Engelbrecht

1954

Phys. Rev.

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“…In this calculation the unshielded nuclear magnetic moment of the bare 81 Br nucleus was taken to be gi 7 = 2.2696(5) [21] (however see Appendix II). The errors given for (1 -oax)giI and gil are one standard deviation and reflect the (statistical) uncertainties in the frequency measurements leading to these values.…”

Section: /?R Nuclear Shieldingmentioning

confidence: 99%

“…[21] is based on the measurements of Ref. [24] and [25], where the ratio of the NMR frequencies of the proton resonance and the 81 Br~-ion in an aqueous solution of KBr and NaBr at a given field was determined to be 0.27003 ±0.03% and 0.27014 ±0.02% respectively.…”

Section: Appendix II Nuclear Magnetic Moment Of An Unshielded Br-nucmentioning

confidence: 99%

The Rotational Zeeman Effect of Methyl-and Silylbromide

Dössel

Sutter

1979

Zeitschrift Für Naturforschung A

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The rotational Zeeman effect of the J->J' = 0->l, K = 0 transition has been investigated for CH3 81 Br and SiH3 81 Br under high resolution. The shielding constant for the 81 Br-nucleus in these molecules has been determined from the spectra and is compared to the values calculated from the spin-rotation coupling constants. The sign of the electric dipole moment in SiHßBr is shown to be ®H3SiBr e . From the Zeeman effect of two K #= 0 transitions of SiHaBr, gy is determined to be negative for SiHaBr, in contrast to CHjBr, where gy is positive.

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“…It is therefore attractive to identify the 77-kev state as the predicted low-lying si state of the shell model; this si state appears as the ground state in both stable 8 iTl 203 and 8iTl 205 . [21][22][23] The experimental evidence for the spin of this excited state is based on a comparison of the measured Coulomb-excitation probability 24 -25 with the E2 gamma-ray transition probability. The most precisely measured B(E2) value 25 for excitation is (0.14_ 0 .04 +002 )X10-48 cm 2 compared with O.llXlO" 48 or 0.22X10 -48 cm 2 depending on whether the spin of the 77-kev state is \ or §, respectively.…”

Section: Spins and Magnetic Momentsmentioning

confidence: 99%

Recoil-Free Resonant Absorption inAu197

1961

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The Mossbauer absorption in Au has been measured at 4°K for the 77-kev gamma ray emitted by Au 197 nuclei embedded in gold, platinum, stainless steel, iron, cobalt, and nickel. In each case, a Doppler-shift curve was measured to find the effective width and the chemical shift. The recoil-free fractions, /, are obtained with the aid of a straightforward analysis, which incidentally shows the errors that can be made in / if the chemical shift and effective width are not taken into account. The observed recoil-free emission fractions were found to be approximately 0.06 (Au), 0.34 and 0.14 (Pt), 0.24 (steel), 0.32 (Fe), 0.27 (Co), and 0.35 (Ni). The relative / values are correct; the correct absolute / values might require a multiplicative correction factor that could be as small as 0.53.Relatively large / values were obtained when the Au 197 radioactive nuclei were in high Debye-temperature lattices composed of light nuclei. Particularly low / values were found when the largest radiation-damage effects were expected.The observed chemical shifts were (in units of 10~6 ev): <0.13 (Au), 0.26 (Pt), 1.3 (steel), 1.4 (Fe), 1.3 (Co), and 1.1 (Ni). These chemical shifts give information more directly interpretable than, but related to, the optical-isotope and isomer shifts and the Knight shift; the magnitudes of the shifts measure directly either the depletion or the enhancement of electron density at the radioactive nuclei in the different lattices.Zeeman splittings of the nuclear energy levels caused by local magnetic fields at Au had relative magnitudes of 1.0: 0.43: <0.10 for Fe, Co, and Ni lattices. If the magnetic moment of the 77-kev excited state in Au 197 is 1.6 nm, the local magnetic fields in Fe and Co were 282 and 122 koe, respectively.

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A Table of Nuclear Moments, January 1950

Cited by 232 publications

References 292 publications

Microwave Absorption Spectra of MnO3F and ReO3Cl

Microwave Absorption Spectra of MnO3F and ReO3Cl

The Rotational Zeeman Effect of Methyl-and Silylbromide

Recoil-Free Resonant Absorption inAu197

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