b336a53425 Bond-lengths and angles are directly related to the atomic positions. ^ Bragg WH (1915). F ( − q ) = F ( − q ) e i ϕ ( − q ) = F ∗ ( q ) = F ( q ) e − i ϕ ( q ) {displaystyle F(-mathbf {q} )=leftF(-mathbf {q} )rightmathrm {e} ^{mathrm {i} phi (-mathbf {q} )}=F^{*}(mathbf {q} )=leftF(mathbf {q} )rightmathrm {e} ^{-mathrm {i} phi (mathbf {q} )}} . Retrieved 2012-10-13. Crystallography Open Database (COD) Protein Data Bank (PDB) Nucleic Acid Databank (NDB) Cambridge Structural Database (CSD) Inorganic Crystal Structure Database (ICSD) Biological Macromolecule Crystallization Database (BMCD) . Elements of X-Ray Diffraction (2nd ed.). "A back-reflection Laue method for determining crystal orientation".
Frankfurt: G. Chem. Phil. I o = I e ( q 4 m 2 c 4 ) 1 cos 2 ⁡ 2 θ 2 = I e 7.94.10 − 26 1 cos 2 ⁡ 2 θ 2 = I e f {displaystyle I{o}=I{e}left({frac {q^{4}}{m^{2}c^{4}}}right){frac {1 cos ^{2}2theta }{2}}=I{e}7.94.10^{-26}{frac {1 cos ^{2}2theta }{2}}=I{e}f} . (1978). Bibcode:1935Natur.135.591C. doi:10.1016/j.pbiomolbio.2004.07.007. These specific directions appear as spots on the diffraction pattern called reflections. A complete data collection may require anywhere between 6-24 hours, depending on the specimen and the diffractometer. Zachariasen WH (1945).
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