Question

Gerry Danilatos pioneered an "environmental" form of this technique in which water vapor is admitted into the sample chamber. In this technique, capturing "backscatter" instead of "secondary" particles emphasizes differences in atomic number rather than surface topology. Prior to this technique, samples can be coated in palladium or carbon (20[1])to avoid (0[1])charging. Dubochet, Frank, and Henderson won a 2017 Nobel Prize for pioneering the use of (*) vitreous ice in the "cryogenic" form of this technique, which has partially supplanted X-ray crystallography for determining protein structure. For 10 points, name this technique with "scanning" and "transmission" types (10[1])that images samples with negatively charged particles. ■END■ (0[1])

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