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Cell positioning imprecision

Figure 18-6 Errors in spectrophotomefric measurements due to dark current noise and cell positioning imprecision in a research-quality instrument. [Data from L D. Rothman. S. R. Crouch, and J. D. Ingle. Jr.."theoretical and Experimental Investigation of Factors Affecting Precision in Molecular Absorption Spectrophotometry." Anal. Chem. 1975,47, 1226.]... Figure 18-6 Errors in spectrophotomefric measurements due to dark current noise and cell positioning imprecision in a research-quality instrument. [Data from L D. Rothman. S. R. Crouch, and J. D. Ingle. Jr.."theoretical and Experimental Investigation of Factors Affecting Precision in Molecular Absorption Spectrophotometry." Anal. Chem. 1975,47, 1226.]...
There are many imprecisions that occur with this method of deriving phases. The bulky heavy-atom compound generally disturbs the positioning of many of the atoms in the area in which it has bound. This may cause local displacements plus changes in unit cell dimensions. Even at 2 A resolution, changes of 2% in unit cell dimensions can cause problems in phase estimations. In addition, the site occupancy of the heavy atom may vary from crystal to crystal and also on X-... [Pg.39]

See other pages where Cell positioning imprecision is mentioned: [Pg.487]    [Pg.275]    [Pg.487]    [Pg.26]    [Pg.1388]    [Pg.413]    [Pg.273]    [Pg.209]    [Pg.388]    [Pg.119]   
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