Round 11: Tossup 19

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 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 “negative stain.” (10[2])The development of a form of this technique, for which Dubochet, Frank, and Henderson were awarded the 2017 (10[1])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, (10[1])name this imaging technique that comes in “scanning,” “transmission,” and (10[3])“cryogenic” types. ■END■ (10[1]0[2])

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