Ian Grant conducted work on relativistic effects in atomic physics, of importance for detailed studies of all atomic systems and particularly for heavy atoms and for highly ionised atoms in laboratory and astronomical plasmas. Ian has made fundamental contributions to the development of the relevant mathematical theory and has shown great skill in writing computer codes which are used worldwide. He obtained accurate results for energy levels and laid the foundations for important further advances. His later work included studies of electron scattering from heavy atoms and of the structures of molecules containing heavy atoms. He also did important earlier work on radiative transfer in stellar and planetary atmospheres.
Professor Ian Grant FRS died on 1 March 2025.
Subject groups
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Mathematics
Applied mathematics and theoretical physics
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Astronomy and Physics
Nuclear atomic and molecular physics
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Chemistry
Chemistry, theoretical
