Mirror, nonreflective

The elements of mirror symmetry d, m, and c can be removed in different ways, resulting in different classes of chiral polymers. Plane d containing the polymer chain is eliminated by the presence, in the main chain, of tertiary carbon atoms —CHR—), or of quaternary atoms with different substituents (—CR R"—), or with equal chiral substituents (—CR R —). Mirror glide plane c does not exist in isotactic structures, nor in syndiotactic ones in which the substituents are chiral and of the same configuration, 75 (33, 263). The perpendicular planes, m, are eliminated by the presence of chiral substituents of the same sign in syndiotactic, 75 (33, 263) or isotactic structures, 76 (263) or if the two directions of the chain are rendered nonreflective. This last condition can be realized in different ways some of which follow (264) ... 

At the sample stage, a flat mirror is mounted perpendicular to the sample on a rotation stage. As part of the laser beam is reflected by the mirror, it interferes with the nonreflected part to form an interference pattern on the photoresist. The period P is given as P = where 6 is the incident angle [44]. After lithography and baking, the templates are then transferred into an electron-beam or a thermal evaporation thin film deposition system for metallization. As the thickness of the metal film is larger than the skin depth of metal, the metallic arrays are considered as semi-infinitely thick. 

Sector mirror A disk with portions that are partially mirrored and partially nonreflecting when rotated, directs radiation from the monochromator of a double-beam spectrophotometer alternately through the sample and the reference cells. 

Never shine a laser on a reflective surface. You must seek to prevent using objects that might reflect a beam inadvertently into the eyes. You should not wear jewelry or watches that could result in inadvertent scattering of a beam. Tools should have matted (rough, nonreflective) surfaces to prevent mirror-like ( specular ) reflections. 

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