Single-atom-at-a-time adsorption studies of 211Bi and its precursor 211Pb on SiO2 surfaces

Dominik Dietzel; Alexander Yakushev; Christoph E. Düllmann; Jadambaa Khuyagbaatar; Jörg Krier; Egon Jäger

doi:10.1515/ract-2024-0327

Article

Single-atom-at-a-time adsorption studies of ²¹¹Bi and its precursor ²¹¹Pb on SiO₂ surfaces

Dominik Dietzel , Alexander Yakushev , Christoph E. Düllmann , Jadambaa Khuyagbaatar , Jörg Krier and Egon Jäger

Published/Copyright: January 21, 2025

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From the journal Radiochimica Acta Volume 113 Issue 3

Abstract

In preparation of gas-phase chemical experiments with moscovium (Mc, element 115), we studied the chemical behavior of the short-lived bismuth radioisotope ²¹¹Bi in helium, argon, and oxygen atmosphere. For that purpose, we performed off-line isothermal gas chromatography experiments at room temperature. Using different carrier gases, the short-lived volatile ²¹⁹Rn precursor, provided from an ²²⁷Ac-source, was transported through the Recoil Transfer Chamber (RTC) at the gas-filled separator TASCA and into the mini-Cryo-Online Multi detector for Physics and Chemistry of Transactinides (miniCOMPACT) chromatography and detection setup. Internal chromatograms were recorded as a function of various parameters including carrier gas type and flow rate, thus characterizing the novel miniCOMPACT detector array. This aids to optimize the conditions for experiments with superheavy elements. The bismuth progeny of ²¹⁹Rn deposited on the SiO₂ surface of the miniCOMPACT via diffusion-controlled deposition. Bismuth showed the expected high reactivity towards the SiO₂ surface of the miniCOMPACT. Experiments in argon and oxygen atmosphere showed no measurable differences in the deposition distribution of the activity. The intermediate 36-min ²¹¹Pb, a member of the ²²⁷Ac decay chain feeding the studied bismuth isotope, was taken into account. To extract thermodynamical data from the results, namely the lower limit of the value of the adsorption enthalpy (−ΔH_ads) of Bi on SiO₂, we performed Monte Carlo simulations, adapted to account for the precursor effect, and compared the experimental results to their output. Simulations were also performed for bismuth’s heavier homologue, moscovium, using a theoretically predicted value for −ΔH_ads of this element on SiO₂. These suggest moscovium to adsorb in the first part of the miniCOMPACT detector array, in line with recent observations.

Keywords: homologs of superheavy elements; bismuth; miniCOMPACT; gas phase chromatography; Monte Carlo simulation; precursor effect

Corresponding author: Dominik Dietzel, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany; and GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany, E-mail: dietzel@uni-mainz.de

Funding source: Deutschlandstipendium scholarship

Funding source: 470 German BMBF

Award Identifier / Grant number: 05P21UMFN2

Research ethics: Not applicable.
Informed consent: Not applicable.
Author contributions: All authors have accepted responsibility for the entire content of this manuscript and approved its submission.
Use of Large Language Models, AI and Machine Learning Tools: D. Dietzel acknowledges the use of ChatGPT by OpenAI for structuring the initial draft and spell checking.
Conflict of interest: The authors state no conflict of interest.
Research funding: D. Dietzel acknowledges the Deutschlandstipendium scholarship. We acknowledge funding from the German BMBF (contract Nr. 05P21UMFN2).
Data availability: The data and the simulation code will be made available upon request, provided that such a request is accompanied by a valid and justifiable reason for accessing the data.

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Received: 2024-06-26

Accepted: 2024-12-12

Published Online: 2025-01-21

Published in Print: 2025-03-26

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Articles in the same Issue

https://doi.org/10.1515/ract-2024-0327

Keywords for this article

homologs of superheavy elements; bismuth; miniCOMPACT; gas phase chromatography; Monte Carlo simulation; precursor effect