We present high resolution 133Cs-13C double resonance NMR data and 13C-13C NMR correlation spectra of 13C enriched samples of the polymeric phase of CsC60. These data lead to a partial assignment of the lines in the 13C NMR spectrum of CsC60 to the carbon positions on the C60 molecule. A plausible completion of the assignment can be made on the basis of an ab initio calculation. The data suppor...

We present the new absolute frequency measurement of ytterbium (171Yb) obtained at INRiM with optical lattice clock IT-Yb1 against cryogenic caesium (133Cs) fountain IT-CsF2, evaluated through a campaign that lasted 14 months. Measurements are performed by either using hydrogen maser as transfer oscillator or synthesizing low-noise microwave for Cs interrogation an comb. The 171Yb unperturbed t...

The pollucite structure is considered as a candidate ceramic crystalline matrix for the immobilization and long-term storage of 135Cs 137Cs fission products, thus, their structural characteristics have particular importance. However, its local has not been fully resolved from reciprocal-space techniques infrared spectroscopy, important discrepancies exist in available literature. Two birefringe...

The blackbody radiation (BBR) shift is an important systematic correction for the atomic frequency standards realizing the SI unit of time. Presently, there is controversy over the value of the BBR shift for the primary 133Cs standard. At room temperatures, the values from various groups differ at the 3x10(-15) level, while modern clocks are aiming at 10(-16) accuracies. We carry out high-preci...

The effectiveness of measuring distances between monovalent and divalent cation sites on enzymes has been examined by 6Li, 7Li, I4N, 15N, 23Na, 39K, 85Rb, 87Rb, and 133Cs nuclear magnetic resonance (NMR). Measurements were made of the paramagnetic effect of enzyme-bound Mn2+ on the longitudinal spin-lattice relaxation rate ( l /T l ) of the monovalent cations by using MnZ+ at the divalent catio...