The Cryo-Thermochromatographic Separator (CTS): A new rapid separation and α-detection system for on-line chemical studies of highly volatile osmium and hassium (Z=108) tetroxides
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The Cryo-Thermochromatographic Separator (CTS) was designed and constructed for rapid, continuous on-line separation and simultaneous detection of highly volatile compounds of short-lived α-decaying isotopes of osmium and hassium (Hs, Z = 108). A flowing carrier gas containing the volatile species is passed through a channel formed by two facing rows of 32 α-particle detectors, cooled to form a temperature gradient extending from 247 K at the channel entrance down to 176 K at the exit. The volatile species adsorb onto the SiO2-coated detector surfaces at a characteristic deposition temperature and are identified by their observed α-decay energies. The CTS was tested on-line with OsO4 prepared from 169-173Os isotopes produced in 118,120Sn(56Fe, 3,4,5n) reactions. An adsorption enthalpy for OsO4 of -40.2 ± 1.5 kJ/mol on SiO2 was deduced by comparing the measured deposition distribution with Monte Carlo simulations. This successful result demonstrates that such a system provides a viable means for the first chemical study of hassium - which is expected to be a homologue of osmium - by determining whether it forms a similarly volatile oxide. © 2001 Elsevier Science B.V. All rights reserved.
author list (cited authors)
Kirbach, U. W., Folden, C. M., Ginter, T. N., Gregorich, K. E., Lee, D. M., Ninov, V., ... Nitsche, H.