D. Olson

EPR studies of some f n and d n electronic impurities in KTaO3 single crystals

Single crystals of the cubic perovskite host, potassium tantalate (KTaO3), doped with iron group, lanthanide, and actinide impurities have been investigated using the technique of electron paramagnetic resonance (EPR). The EPR spectra of Yb3+ and U5+ have been observed for the first time in potassium tantalate by employing crystals co‐doped with both impurities. Multiple doping of the material during the crystal growth process avoided the production of semiconducting KTaO3 and resulted in the incorporation of adequate concentrations of the trivalent lanthanide ion Yb3+. The EPR results indicate that Yb3+ occupies a site in which the local symmetry is axial as a result of nearby charge compensation. Pentavalent uranium is found to occupy a substitutional cubic symmetry site. EPR investigations of Cu2+, Co2+, Mn2+, Ni3+, and Fe3+ were also carried out.

The hyperfine spectrum of KF

Abstract A molecular beam electric resonance spectrometer was used to observe the hyperfine spectrum of KF, including both K isotopes, vibrational states 0–7 and rotational states 1–3. The 73 observed transitions were fitted with 14 parameters expressing the vibrational and rotational dependence of each of the molecular hyperfine constants. Experimental uncertainties of the order of 1 Hz were achieved.

Evidence for a nuclear hexadecapole interaction in the hyperfine spectrum of LiI

The molecular beam electric resonance technique has been used to examine the hyperfine spectrum of 7LiI to determine the nuclear hexadecapole interaction of the iodine nucleus. The nuclear magnetic octupole interaction was also considered but found to be marginally significant. A total of 172 transitions in vibrational states 0-3 and rotational states 1-6 have been included in a fit to determine the iodine nuclear quadrupole, spin-rotation, and hexadecapole interactions, the lithium quadrupole and spin-rotation interactions, and the tensor and scalar parts of the spin-spin interaction. Vibration and rotation dependencies of these constants have been determined. The results include: eHh=−0.0151(30), eQIqI=−194351.212(17)−8279.521(46)(v+1/2)+100.616(34)(v+1/2)2−0.3949(73)(v+1/2)3−6.41977(50)J(J+1)+0.10593(33)(v+1/2)J(J+1),eQLiqLi=172.613(52)−3.26(14)(v+1/2)+0.00145(87)J(J+1),cI=6.80260(32)+0.00303(49)(v+1/2)−0.000118(13)J(J+1), cLi=0.75872(72)−0.0088(11)(v+1/2), c3=0.62834(68)−0.0050(11)(v+1/2), c4=0.06223(...

The hyperfine interactions in CsF

The molecular beam electric resonance technique has been used to examine the hyperfine spectrum of CsF to determine the nuclear quadrupole interaction of the cesium nucleus. A total of 95 transitions in vibrational states v=0−5 and rotational states J=1−8 have been included in a fit to determine the cesium nuclear quadrupole and spin–rotation interactions, the fluorine spin–rotation interaction, and the tensor and scalar parts of the spin–spin interaction. Vibration and rotation dependencies of these constants have been determined, allowing correction for zero point vibration effects. This experimental Cs nuclear quadrupole coupling constant when combined with the electric field gradient calculated using a relativistic coupled cluster method yields a nuclear quadrupole moment of the Cs nucleus equal to eQ=−3.43098 mbarn. The vibrational dependence of the coupling constant is smaller than the theoretical estimate. The coupling constants we have determined are the following: eQCsqCs=1245.598(10)−14.322(25)(...

The electric dipole moment and hyperfine interactions of KOH

A molecular beam spectrometer has been used to observe the hyperfine spectrum and determine the electric dipole moment of the KOH molecule. This EDM had never been measured previously, although theoretical calculations had been made. A refined line shape fitting procedure has helped make possible this determination from the molecular beam hyperfine spectrum. The value of the EDM, which we found for the ground vibrational state, is 7.415±0.002 debye. The hyperfine constants, including the potassium nuclear quadrupole, both spin–rotation interactions, and the tensor and scalar spin–spin interactions have been determined for several vibrational states.