Question

A telltale sign of this phenomenon is the magnitude of the intensity distribution statistic “E squared minus 1” being lower than expected. The Yeats–Padilla (“pa-DEE-ya”) test detects this phenomenon’s hemihedral (“HEM-ee-HEE-dral”) form, which is an instance (10[1])of its merohedral (“MEER-oh-HEE-dral”) form. When this phenomenon occurs, three-by-three matrices describing it are required to perform structure factor refinement. This phenomenon is defined by two things: a “fraction,” which quantifies the relative volumes of the different domains, and a “law,” which is a set of symmetry operators. This phenomenon can occur when the crystal lattice point group has a higher order than the crystal structure point group. Orthoclase exhibits the Carlsbad form of this (10[1])phenomenon, (10[1])in which one domain is rotated 180 degrees (-5[1])about (-5[1])the [001] (“0-0-1”) axis. For (10[1])10 points, name this phenomenon in which multiple crystals (-5[1])of the same species (10[2])are joined together (10[1])in (10[1])different orientations. ■END■ (10[1]0[10])

ANSWER: crystal twinning [or twinned crystals; accept Carlsbad twinning; accept twin laws; accept twin fraction; accept twin ratio; accept twin scale factor; accept merohedral twinning or hemihedral twinning]
<Other Science>
= Average correct buzz position

Summary

2023 ACF Nationals04/22/2023Y1656%0%19%117.00

Buzzes

PlayerTeamOpponentBuzz PositionValue
Dan NiCornell BStanford A3310
Geoffrey ChenCornell AImperial A10710
Arya KarthikGeorgia Tech AIllinois A10810
Karsten RynearsonYale BWUSTL A116-5
Joseph ChambersVirginia AJohns Hopkins A117-5
Raul PassementTexas AOhio State A12110
Daniel YangChicago BIowa State A130-5
Nikhil ChellamNorthwestern AClaremont A13410
Tracy MirkinFlorida ASouth Carolina A13410
Dennis ReppenChicago CMIT A13710
Claire JonesChicago AMinnesota A13810
Maximillian NieburJohns Hopkins AVirginia A14110
Ian ChowToronto AIndiana A1410
Aum MundheRutgers AHarvard A1410
Vedul PalavajjhalaWUSTL BRutgers B1410
Alex AkridgeIndiana AToronto A1410
Ani PerumallaPenn State AFlorida B1410
Jeya IyaduraiFlorida BPenn State A1410
Jerry LinDuke AMichigan A1410
Arjun NageswaranHarvard ARutgers A1410
Collin AceRutgers BWUSTL B1410
Todd MaslykMichigan ADuke A1410