Online Gas Adsorption Chromatography with Tl on Fused Silica for Next-Generation Chemistry Experiments with Nh

Le résumé fourni par la source

Presented here are comprehensive online gas adsorption chromatography experiments with thallium on fused silica surfaces toward an unambiguous chemical characterization of nihonium (Nh, Z = 113). Short-lived 184 Tl ( t 1/2 = 10.1 ± 5 s), produced in the nuclear fusion-evaporation reaction 141 Pr( 48 Ti, 5n) 184 Tl, was velocity-separated and introduced into the chemistry setup mounted in the focal plane of the separator. Isothermal gas adsorption chromatography experiments with a fused silica stationary phase at different dehydroxylation stages revealed a strong influence on the yield of transported Tl species. The evaluated adsorption enthalpies of the presumed monohydroxide TlOH of – Δ H ads d-SiO 2 (TlOH) = 127 ± 3 kJ/mol (dehydroxylated SiO 2 ) and −Δ H ads h-SiO 2 (TlOH) = 132 ± 12 kJ/mol (hydroxylated SiO 2 ) agree well with earlier offline experiments. In the case of a dehydroxylated stationary phase, the chemical speciation of Tl shifted from TlOH to less volatile species TlX2 with −Δ H ads d-SiO 2 (TlX2) ≥197 kJ/mol. The presented findings highlight the central role of the fused silica stationary phase in order to promote the formation of a defined chemical species of heavy Group 13 elements Tl and potentially Nh. The outcome is compared to state-of-the-art theoretical predictions.

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