Last update: June 29, 2018 (see Updates)
This site was created in 1990 by Prof. Helmut Paul (1929-2015), from the University of Linz. For 25 years he collected the published stopping power data, including the first measurements performed in the 30s. He made his exhaustive collection of stopping power data, graphs, and programs available to the entire scientific community through this online database. Since then, this database has been extensively employed in theoretical and experimental research and in applied sciences. For details on Helmut Paul's work on stopping power and recent work on this database, see the publications.
This collection considers all ions and targets: solids (amorphous or polycrystalline), gases, elements and compounds, including new materials such as polymers, oxides and silicates. It treats the "electronic" stopping power assuming that "nuclear" stopping has been subtracted.
Detailed information on the content and organization of the database is provided in the Introduction page available also on the left-hand menu bar. Graphs and data files for Hydrogen Ions, Helium Ions, and Heavier Ions can also be found by following the links on the left-hand menu bar.
In 2015, the collection was taken over by the Nuclear Data Section of the International Atomic Energy Agency. Since December 2015, Dr Claudia Montanari, from the Instituto de Astronomía y Física del Espacio, CONICET and Universidad de Buenos Aires, Argentina, is collaborating with the IAEA on the updating and development of the database.
Sadly, Helmut passed away on 21 December 2015. He will be dearly missed, but he will always be remembered through his legacy: the stopping power database. A personal account of life as a physicist by Helmut Paul can be found here.
Please send your questions, comments and suggestions regarding...
...methods, graphs and data to:
Dr Claudia Montanari / Instituto de Astronomía y Física del Espacio
...this site to:
International Atomic Energy Agency / Nuclear Data Section