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Packet G: Bonus 13

Incomplete measurements from CCDs in this technique can lead to a loss of information called the “phase problem.” For 10 points each:
[10e] Name this technique that uses low-wavelength light to probe lattice structures. Rosalind Franklin used this technique to determine the structure of DNA.
ANSWER: X-ray crystallography [or X-ray diffraction or XRD]
[10m] X-ray crystallography is limited in scale by the diffraction limit for this quantity usually measured in angstroms. A coefficient of 1.22 appears in the Rayleigh criterion for this quantity.
ANSWER: resolution [accept angular resolution; accept resolving power; prompt on angle]
[10h] Molecular modelling using X-ray crystallography uses this quantity defined by summing differences in structure factors over all reflections. A “free” form of this quantity is usually one tenth the resolution.
ANSWER: R-factor [or R-value; accept R-free; accept discrepancy index]
<Ohio State A, Chemistry> | Packet-G_Chicago-B_Ohio-State-A_UW-B

HeardPPBE %M %H %
5714.0495%30%16%

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Conversion

TeamOpponentPart 1Part 2Part 3TotalParts
Liberty AWake Forest0000
UNC BLiberty B100010E
UNC CLiberty C100010E
UNC DWilliam & Mary100010E
Virginia ASouth Carolina100010E
Virginia Tech ADuke1001020EH

Summary

TournamentEditionMatchHeardPPBE %M %H %
California2025-02-01✓313.33100%33%0%
Florida2025-02-01✓225.00100%100%50%
Lower Mid-Atlantic2025-02-01✓610.0083%0%17%
Midwest2025-02-01✓610.00100%0%0%
North2025-02-01✓313.3367%33%33%
Northeast2025-02-01✓514.00100%20%20%
Overflow2025-02-01✓520.00100%40%60%
South Central2025-02-01✓220.00100%100%0%
Southeast2025-02-01✓412.50100%0%25%
UK2025-02-01✓1013.00100%30%0%
Upper Mid-Atlantic2025-02-01✓816.2588%63%13%
Upstate NY2025-02-01✓310.00100%0%0%