Hyperfine structure measurements in the4 I 9/2 ground state of141Pr

Abstract

Abstract. Using the atomic beam magnetic resonance method, the five hyperfine structure separations in the 4f 3 6s 2 419. 2 ground state of 141 _ 59P1 have been measured. The results are:6477.913423 (17) 6 5 5556.359848 (6) 5 4 4633.023306 (2) 4 3 3708.201146 (5) 3 2 2782.190601 (15) From these quantities, the multipole interaction constants Ak, k = 1, 2, 3, 4 between the nucleus and the electron shell have been calculated. A 4 especially then served to give the following limit for the intrinsic hexadecapole moment: IQ4ol <0.4eb 2. Furthermore, the gs-factors of the 41 multiplet have been measured at magnetic fields of 300 Oe. The results are: gj(419.2) =0.731 037 1(15) gj(4Ii1~2) =0.965 1476 (20) gj(41132) = 1.106 319 7(40) gj(d'I152)= 1.197963 (30) Small corrections due to perturbations by neighbouring fine structure levels are included.

Detection of a hexadecapole interaction in the atomic ground state3 H 6 of167Er

“…Stimulated by this fact, during the last few years ABMR-measurements on various isotopes of the rare earth region have been performed with the aim to detect a !6-pole interaction [9,10]. An estimation for the intrinsic 16-pole moment of 141Pr, derived from these experiments, is in accordance with the order of magnitude expected from the escattering experiments, whereas the value for 165Ho of about 10 eb 2 seems to be too big compared to the expected value of 0.4-0.5 eb 2.…”

“…For hfs measurements performed in only one fs state this has been done up until now by using (3) and a set of theoretical hfs interaction parameters a~s, b~s (see e.g. [9,10]). The concept described in this paper now offers the chance to determine experimental a~s, b o in such a case.…”

Ab-initio calculations of pair-correlation effects on the hyperfine structure of the 4s 4p and 4s 3d configurations of Ca

“…The interaction between the magnetic field and the nuclear magnetic dipole moment pi=gi#NI dominates, but also the interaction between the electric field gradient at the nuclear site and the nuclear quadrupole moment Q gives significant contributions to the hfs. The effects of the higher-order nuclear moments on the hfs are very difficult to measure [15] and they will not be considered here. In a nonrelativistic treatment the hyperfine Hamiltonian, which acts on all electrons in the wave function, is, using atomic units…”

Theoretical analysis of 4f25d2 configuration of singly ionized praseodymium

“…Praseodymium (Pr) is one of the rare Earth elements with a commonly open 4f electron shell. 141 Pr 59 is the only stable isotope that occurs naturally, with electronic ground state [Xe] 4f 3 6s 2 , 4I o 9/2 , nuclear magnetic dipole moment μ 1 =4.2754 (5) μ N , nuclear spin quantum number I=5/2 [1] and nuclear electric quadrupole moment Q=−0.0024b [2]. Pr is very rich in optical spectrum.…”