OR helium ion microscopy, but that is not as widely available afaik 1: https://en.wikipedia.org/wiki/Scanning_helium_ion_microscope https://en.wikipedia.org/wi

OR helium ion microscopy, but that is not as widely available afaik 1: https://en.wikipedia.org/wiki/Scanning_helium_ion_microscope https://en.wikipedia.org/wiki/Scanning_helium_ion_microscope