Tossup

Preventing the use of rotationally symmetric static fields in this technique can help overcome a limit set by Scherzer’s theorem. The “spot-scan” technique (10[1])is sometimes used to prevent beam-induced motion in this larger technique. Samples in this technique may use heavy metals such as tungsten and osmium to undergo a (-5[1])“negative stain.” The development of a form of this technique, for which (-5[1])Dubochet, Frank, and Henderson were awarded the 2017 Nobel Prize in Chemistry, generated a “resolution revolution.” (10[1])In a form of this technique, the observed specimen is embedded in vitrified ice before being mounted on a grid and fixed via plunging in liquid ethane. For 10 points, name this imaging technique that comes (-5[1])in “scanning,” “transmission,” and “cryogenic” types. ■END■ (10[4])

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