IAEA Consultancy Meeting on Fusion Data of Negative Ions

Please note IAEA does not share meeting participant information with third parties for accommodation booking or for any other purposes. If participants ever get any email messages that make it seem like their information is being shared, they should not reply that email or click any of the link presented on that email contact the IAEA meeting organizers and report the issue. Background A negative ion, which is formed when an electron is attached to a neutral system, is a unique quantum system. Negative ions have numerous applications in diverse fields of science and industry. One of the most visible and important uses is in magnetic confinement fusion , where the small binding energy of negative ions is utilized creating high-energy neutral ion beams (NBIs). Energetic NBIs are injected in the fusion plasma fuel for heating up the plasma core and for plasma diagnostic purposes through charge-exchange recombination spectroscopy (CXRS). Negative ions have also been detected in the interstellar medium and planetary atmospheres. They are crucially important for understanding of opacities of fusion-driven stars. Negative ions are used in photodetachment spectroscopy, research on atmospheric and environmental processes, surface and materials analysis, and many other fields. Objectives This IAEA Consultancy Meeting is to launch a coordinated database-creation and literature search effort that consolidates negative-ion atomic data into an accessible, evaluated resource by IAEA. It is motivated by the central role of negative ions in nuclear fusion applications (NBI heating, CXRS), where reliable data are essential for beam production, neutralization, and plasma modelling. The meeting will define a practical workflow to identify, collect, and index the full literature (from early foundational papers to the latest results), with consistent metadata and traceability to sources. It will also establish shared criteria for critical assessment and uncertainty evaluation so that recommended values can be derived where multiple measurements exist or where accuracy is limited. Finally, it will align experts and database developers on technical requirements and milestones to enable efficient integration into IAEA databases and into NIST Atomic Spectra Database (and its successor at NASA Goddard Space Flight Center). About the Organizer Atomic and Molecular Data Unit, IAEA The IAEA's Atomic and Molecular Data (AMD) Unit has facilitated collaborative international research for the production, evaluation and recommendation of data for global fusion R&D [1]. The AMD Unit maintains both numerical and bibliographical databases for fusion [2] and has organized several international coordinated research programmes, meetings, workshops and schools to review atomic and molecular (AM) and plasma-surface interaction (PSI) as well as plasma-material interaction (PMI) research for fusion [3-5]. Online information [1] https://amdis.iaea.org/ [2] https://amdis.iaea.org/databases/ [3] https://amdis.iaea.org/CRP/ [4] https://amdis.iaea.org/meetings/ [5] https://amdis.iaea.org/workshops/