ZnO–B
2O
3–P
2O
5 glasses formulated with Sb
2O
3 were investigated in the series 50ZnO–10B
2O
3–40P
2O
5
+
xSb
2O
3 (
x
=
0–70
mol%). With increasing Sb
2O
3 content, the values of glass transition ...temperature decrease from 492
°C down to 394
°C. The dissolution rate of the glasses reveals a maximum for the glass with
x
=
15
mol% Sb
2O
3. Raman spectra with increasing Sb
2O
3 content reflect the depolymerisation of phosphate chains. Antimony at low Sb
2O
3 content forms individual SbO
3 pyramids manifested in the Raman spectra by a broad vibrational band at ∼520–690
cm
−1. In the glasses with a higher Sb
2O
3 content SbO
3 units link into chains and clusters with Sb–O–Sb bridges manifested in the Raman spectra by a strong broad band at 380–520
cm
−1. The
31P MAS NMR spectra with increasing Sb
2O
3 content reflect the depolymerisation of phosphate chains at low Sb
2O
3 content and only small changes in the PO
4 coordination at a high Sb
2O
3 content.
11B MAS NMR spectra reveal a steady transformation of B(OP)
4 units into B(OP)
4−
x
(OSb)
x
units, accompanied by the transformation of BO
4 into BO
3 units with increasing Sb
2O
3 content.
The Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) is a mid-infrared emission spectrometer which is part of the core payload of the Envisat satellite, launched by ESA in March ...2002. It provides unique observations of the atmospheric spectral radiances in the 4.15 - 14.6 μm spectral interval with innovative limb scanning capabilities for the three dimensional observation of the atmospheric composition and processes. The species, the processes and events that have been studied with this instrument in its 10 years of operation are briefly reviewed.
Small-angle correlations of Proton pairs produced in central Ni+Ni collisions at a beam energy of 1.93 AGeV are investigated with the FOPI detector System at GSI Darmstadt. A well-defined emission ...source is selected by triggering on central events which comprise about 8% of the total cross section. Simultaneous comparison of longitudinal and transverse correlation functions with the predictions of the Koonin model allows to unravel the space-time ambiguity of the emission process. Taking into account the strong collactive expansion of the participant zone, which introduces a reduction of the extracted source radius of more than 30% r.m.s. radius and emission time parameters of Rrms = ( 4.2 ± 1.2) fm and trms = (11+7-5) fm/c are extracted, respectively. In contrast, the analysis of the angle-integrated correlation function gives an upper limit Rrms = (7.0 ± 1.4) fm of the source radius.
Small-angle correlations of Proton pairs produced in central Ni+Ni collisions at a beam energy of 1.93 AGeV are investigated with the FOPI detector System at GSI Darmstadt. A well-defined emission ...source is selected by triggering on central events which comprise about 8% of the total cross section. Simultaneous comparison of longitudinal and transverse correlation functions with the predictions of the Koonin model allows to unravel the space-time ambiguity of the emission process. Taking into account the strong collactive expansion of the participant zone, which introduces a reduction of the extracted source radius of more than 30% r.m.s. radius and emission time parameters of Rrms = ( 4.2 ± 1.2) fm and trms = (11+7-5) fm/c are extracted, respectively. In contrast, the analysis of the angle-integrated correlation function gives an upper limit Rrms = (7.0 ± 1.4) fm of the source radius.
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