Scanning Helium Ion Microscope

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A Scanning Helium Ion Microscope (SHIM, HeIM or HIM) is a new imaging technology based on a scanning helium ion beam.[1] This technology has several advantages over the traditional scanning electron microscope (SEM). Due to the very high source brightness, and the short De Broglie wavelength of the helium ions, which is inversely proportional to their momentum, it is possible to obtain qualitative data not achievable with conventional microscopes which use photons or electrons as the emitting source. As the helium ion beam interacts with the sample, it does not suffer from a large excitation volume, and hence provides sharp images on a wide range of materials. Compared to a SEM, the secondary electron yield is quite high, allowing for imaging with currents as low as 1 femtoamp. The detectors provide information-rich images which offer topographic, material, crystallographic, and electrical properties of the sample. In contrast to other ion beams, there is no discernible sample damage due to relatively light mass of the helium ion. The drawback is the cost.

Since 2007 this technology is commercialized and instruments have been shipped to customers.[2] A surface resolution of 0.24 nanometers has been demonstrated.[3][4]

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