We observed high-resolution photoassociation spectra of laser-cooled ytterbium (Yb) atoms in the spin-forbidden 1S0 - 3P1 intercombination line. The rovibrational levels in the 0u+ state were measured for red detunings of the photoassociation laser ranging from 2.9 MHz to 1.97 GHz with respect to the atomic resonance. The rotational splitting of the vibrational levels near the dissociation limit were fully resolved due to the sub-MHz linewidth of the spectra in contrast to previous measurements using the spin-allowed singlet transition. In addition, from a comparison between the spectra of 174Yb and those of 176Yb, a d-wave shape resonance for 174Yb is strongly suggested.

The solubility of uranium(VI) is investigated in the pH range 2.8 to 4.6 in equilibrium with 8.0% and 0.3% C0 2 partial pressure and in the pH range 3.8 to 7.0 in equilibrium with 0.03% C0 2 partial pressure at / = 0.1 M NaC10 4 and 25° C. U0 2 C0,(s) under 8.0% and UO, · 2 H 2 0 under 0.3% C0 2 and 0.03% C0 2 partial pressures at pH < 7 are characterized as solubility limiting solid phases. Above pH 7, a spontaneous phase transformation of UO, · 2 H 2 0(S) in a sodium containing poorly crystalline material is observed. Thermodynamic solubility products lg K% = -14.91 ±0.10 for U0 2 C0,(s) and = 4.68 ±0.14 and Ig A? = 5.14 ±0.05 for UO, · 2 H 2 0(s) under 0.3% and 0.03% C0 2 partial pressures, resp. are obtained. The evaluation of UO, · 2 H 2 0(S) solubilities on basis of spectroscopic speciation by TRLFS are discussed and a formation constant lg K', 5 = -17.14 ±0.13 is obtained.

Purpose: This study aimed to evaluate comprehensively; accuracy, repeatability and reproducibility of T 1 and T 2 relaxation times measured by magnetic resonance fingerprinting using B + 1 -corrected fast imaging with steady-state precession (FISP-MRF). Methods:The International Society of Magnetic Resonance in Medicine/National Institute of Standards and Technology (ISMRM/NIST) phantom was scanned for 100 days, and six healthy volunteers for 5 days using a FISP-MRF prototype sequence. Accuracy was evaluated on the phantom by comparing relaxation times measured by FISP-MRF with the reference values provided by the phantom manufacturer. Daily repeatability was characterized as the coefficient of variation (CV) of the measurements over 100 days for the phantom and over 5 days for volunteers. In addition, the cross-scanner reproducibility was evaluated in volunteers. Results:In the phantom study, T 1 and T 2 values from FISP-MRF showed a strong linear correlation with the reference values of the phantom (R 2 = 0.9963 for T 1 ; R 2 = 0.9966 for T 2 ). CVs were <1.0% for T 1 values larger than 300 ms, and <3.0% for T 2 values across a wide range. In the volunteer study, CVs for both T 1 and T 2 values were <5.0%, except for one subject. In addition, all T 2 values estimated by FISP-MRF in vivo were lower than those measured with conventional mapping sequences reported in previous studies. The crossscanner variation of T 1 and T 2 showed good agreement between two different scanners in the volunteers. Conclusion: B +1 -corrected FISP-MRF showed an acceptable accuracy, repeatability and reproducibility in the phantom and volunteer studies.

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