The TWINS project (Two Wide-angle Imaging Neutral-atom Spectrometers) is mainly devoted to measure high energy neutral atoms (ENAs) originating via charge exchange of protons with geocoronal hydrogen atoms in the plasmasphere and magnetosphere. In order to unfold the local ion density along the line-of-sight (LOS) from the integrated ENA flux measurements, a good knowledge of the geocoronal hydrogen density distribution is needed. Therefore, two Lyman-α detectors (LADs)-designed and calibrated by the authors-were added to the TWINS package. These detectors register line-integrated Lyman-α resonance emission intensities which then can be used to get the actual local hydrogen densities with the help of a numerical inversion routine.

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11B NMR and Raman scattering measurements are performed with glasses both, in the B2O3GeO2 and the BaOB2O3GeO2 systems. All glasses in the ternary system exhibit a constant molar concentration ratio of R = CBaO/CB2O3 = 0.25. It is shown that the six‐membered boron‐oxygen rings are not destroyed with GeO2 incorporation and the GeO4 tetrahedra are nearly randomly distributed between the tetraborate groups. The BO4 tetrahedra of the triborate units are found to be generally bonded to GeO4 tetrahedra. A possible explanation for the phase separation in the ternary system is proposed.