TEM Observation of Helium
- Practical Electron Microscopy and Database -
- An Online Book -


This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.


Some chemical elements cannot induce contrast in TEM images. For instance, the presence of helium atoms in palladium tritides does not induce a detectable change in the HRTEM contrast. [1] This can be interpreted by the low scattering factor of helium atoms compared to palladium one.



[1] S. Thiébaut, B. Décamps, J. M. Pénisson, B. Limacher, A. Percheron Guégan, TEM study of the aging of palladium-based alloys during tritium storage, Journal of Nuclear Materials 277 (2000) 217-225.




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