An alternative test specimen for medium resolution evaluation and for the day-to-day visual checking of instrument performance is a tin on carbon specimen. This consists of a dispersion of tin spheres,within the size range 10 - 100nm, on a carbon substrate. Ideal for astigmatism correction, it is also recommended for use in SEMs employed in the semiconductor industry, where the usual gold on carbon sample cannot be used because of the risk of gold poisoning.
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