Hyperfine structure of seven atomic levels of91Zr and the91Zr nuclear electric quadrupole moment

Abstract

The hyperfine structure of the low-lying atomic levels 4d 2 5 S 2 3F2,3,4 and 4d s 5 s 5F2, 3,< s of 9tZr has been studied using the atomic-beam magnetic-resonance method. Using intermediate coupling wave functions derived for the configurations (4d + 5s) 4 the experimental data are analysed with respect to the effective operator formalism. The effective radial parameters of the magnetic dipole and electric quadrupole interaction are determined for the two configurations 4d 2 5s 2 and 4d 3 5s and are compared with relativistic calculations. The value obtained for the electric quadrupole moment of the 91Zr nuclear ground state is Q =-0.21(2) barn (uncorrected for core polarization effects).

Rotational spectra and hyperfine constants of ZrO and ZrS

“…Neither eQq 510 nor eQq 420 is available in the literature; however, there is an experimental value of ͗r Ϫ3 ͘ 4d ϭ2.30a 0 Ϫ3 for the 4d 2 5s 2 configuration. 45 Using this value and the expression…”

Ist 91Zr-Festkörper-Kernresonanzspektroskopie praktikabel?

“…Während die hochauflösende Kernresonanzspektroskopie an "gebräuchlichen" Ker nen (*H, ÜB, 13C, 31P, 27AI, 29Si) seit Jahren erfolg reich zur Strukturaufklärung im Festkörper ange wandt wird, sind NMR-Untersuchungen am Zirkonium-91-Kern nur in eng begrenztem Umfang be kannt [1][2][3][4][5]. Die Ursache dafür ist neben der geringen Empfindlichkeit (Häufigkeit des Isotops = 11,23%; re lative Empfindlichkeit = 9,48 • 10"3), vor allem im starken Kernquadrupolmoment des Zirkonium-91-Kerns (-0.21 • 10"28 m2 [6]) zu sehen.…”

Nuclear magnetic resonance on oriented192Ir in Fe and Ni

“…the ratio of the EFGs in Fe and Ni, is given in column 4. Btittgenbach et al [12] have measured the hyperfine interaction constants A and B of states in 191Ir and ~93Ir using the atomic beam magnetic resonance method. It should be noted that this ratio is strongly different from that of the hyperfine fields (Table 5).…”

“…Recently, the nuclear orientation technique (NO) has been applied to 186,18s, 189,19o, 192irO s and 186, 188, 189irR_ee [5][6]. As the ground state quadrupole moments of 191Ir and 193Ir are known with good accuracy [12][13] the corresponding EFGs can be determined precisely. This can be obtained if one of the corresponding quadrupole moments is measured with another technique.…”