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arXiv 1306.1646cond-mat.mtrl-scimath.RAphysics.chem-ph
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Clifford几何代数中的晶面与倒易空间

Crystal planes and reciprocal space in Clifford geometric algebra

Eckhard Hitzer

摘要:

本文讨论了射影空间$\R^{n+1}$中由$(k+1)$点给出的$k$ D晶胞的几何性质。我们展示了重心和分数(晶体学)坐标,倒易矢量和对偶表示的概念如何在射影几何代数$Cl(\R^{n+1})$中相关(和几何解释)(见Grassmann H.,由Engel F.编辑,1844年的《天文学》和《地理学》,第1卷,第1部分,托布纳:莱比锡,1894年。)在共形代数$Cl(\R^{n+1,1})$中。$d$ -间距,相位角,结构因子,布拉格反射的条件,和晶面的界面角的晶体学概念在相同的上下文中获得。保留字:Clifford几何代数、晶体学、倒易空间、$d$ -间距、相位角、结构因子、布拉格反射、界面角

英文摘要:

This paper discusses the geometry of $k$D crystal cells given by $(k+1)$ points in a projective space $\R^{n+1}$. We show how the concepts of barycentric and fractional (crystallographic) coordinates, reciprocal vectors and dual representation are related (and geometrically interpreted) in the projective geometric algebra $Cl(\R^{n+1})$ (see Grassmann H., edited by Engel F., Die Ausdehnungslehre von 1844 und die Geom. Anal., vol. 1, part 1, Teubner: Leipzig, 1894.) and in the conformal algebra $Cl(\R^{n+1,1})$. The crystallographic notions of $d$-spacing, phase angle, structure factors, conditions for Bragg reflections, and the interfacial angles of crystal planes are obtained in the same context. Keywords: Clifford geometric algebra, crystallography, reciprocal space, $d$-spacing, phase angle, structure factors, Bragg reflections, interfacial angles

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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