Search

The hyperfine structure of an atomic transition in 180 Ta was investigated by laser-induced resonance fluorescence. As a result we obtained for the quantity μ I 180 (1+ 1 2 I 180 ) the value 5.04 (5) μ N . This experimental result is best reproduced assuming parallel coupling of a 9 2 − [514] proton and a 9 2 + [624] neutron. It is concluded that 180 Ta most likely has I π =9 − and a magnetic dipole moment μ I =4.77 (5) μ N .

Isotope shifts of all the stable isotopes and the hyperfine splittings of 115Sn, 117Sn and 119Sn have been measured in the transitions 5s25p23P0-5s25p6s3P1 at 286 nm in Sn I. Tin atoms in a collimated beam to reduce the Doppler width were excited by radiation at 286 nm generated by frequency doubling the light from a CW ring dye laser. Spectra were recorded by monitoring the subsequent decay and calibrated by optical heterodyning. The relative positions of the isotopes are, in MHz: 112; 0.0(1.0), 114;319.5(1.3), 115;412.7(1.1), 116;640.0(0.6), 117;746.8(0.7), 118;945.2(0.7), 119;1039.3(1.1), 120;1214.4(0.5), 122;1448.5(0.7), 124;1656.0(0.7). The bracketed uncertainties are added in quadrature to give the errors of the isotope shifts. For odd-even shifts involving 112, 114, 120, 122 and 124 an extra 0.5 MHz must be added in quadrature. The hyperfine splitting factors of 5s25p6s3P1 are, in MHz: A(115)=-4395.4 (2.1), A(117)=-4790.71(1.7), A(119)=-5014.8(1.9). The results are interpreted in terms of the electronic and nuclear properties of the tin isotopes.

Using the method of atomic-beam magnetic resonance, detected by laser-induced resonance fluorescence (ABMR-LIRF), the atomic ground-state hyperfine intervals of 50V were precisely measured. A quadrupole moment ratio Q( 50 V ) / ( 51 V = −4.03(3) is obtained which results in Q( 50 V ) = +0.21(4) b .

The nuclear ground-state magnetic dipole moments of 177Hf and 179Hf have been determined with the atomic beam magnetic resonance method. The results are: μ I ( 177 Hf = 0.7836(6)μ N , μ I ( 179 Hf) = −0.6329(13) μ N (uncorrected for diamagnetic shielding).