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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
Columbia BNYU A1010020EM
George Washington BPenn B010010M
Haverford AColumbia C1010020EM
John Jay CollegeMaryland A100010E
Johns Hopkins AVassar A10101030EMH
Maryland BPenn A100010E
Rutgers AGeorge Washington A100010E
Yale ANYU B1010020EM

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%