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Risultati sfruttabili
Gas chemical studies of the transactinide element 104 have been performed at a "single-atom-at-a-time" level in February/March 1996 at FLNR in Dubna. It was possible to show that element 104 chloride (presumably 104Cl4) is more volatile than element 104 bromide (104Br4). By adding oxygen to the chlorinating gas the volatile species showed increased retention behaviour in the chromatography column which could be explained by reactions of 104Cl4 with the surface of the quartz column.
Thermochromatography experiments with short-lived isotopes of Mo and W produced with the U400 cyclotron of FLNR in Dubna and using air saturated with thionylchloride yielded two volatile species for each element which were interpreted as the dioxodichlorides and the oxotetrachlorides.
The first ever on-line isothermal gas chemistry experiments with element 106 have been performed during two beam times at GSI Darmstadt. It was found that this element behaves similar to molybdenum and tungsten, as expectd on the basis of its position in the periodic table. Using chlorine saturated with thionylchloride and some oxygen as reactive gas the formed molecules had the volatility series MoX > WX > 106X, with X presumably being O2Cl2.
In addition the half-lives of the new alpha-decaying neutron-rich isotopes 256106 and 266106 could be determined to be 5+4-2 and 16+21-6 s, respectively.
In a final model experiment at FZ Rossendorf, the gaschromatographic behaviour of new volatile species, the basic oxides, was investigated with Mo.
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