Difference between revisions of "Guinier plot"

Revision as of 08:17, 25 July 2015

A Guinier analysis attempts to extract the size-scale for a structure by fitting the scattering to an equation of the form:

I(q)=I_{0}\exp \left(-{\frac {R_{g}^{2}}{3}}q^{2}\right)

\ln(I(q))=\ln(I_{0})-(R_{g}^{2}/3)q^{2}

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 A Guinier analysis attempts to extract the size-scale for a structure by fitting the [[scattering]] to an equation of the form:
-:<math>\ln(I) \sim 1 - (R_g^2/3)q^{2} </math>
+:<math>I(q) = I_0 \exp \left( - \frac{R_g^2}{3} q^{2} \right) </math>
+:<math>\ln(I(q)) = \ln(I_0) - (R_g^2/3)q^{2} </math>
 ==See Also==
 * P. Thiyagarajan, T. S. Burkoth, V. Urban, S. Seifert, T. L. S. Benzinger, D. M. Morgan, D. Gordon, S. C. Meredith and D. G. Lynn [http://journals.iucr.org/j/issues/2000/03/01/issconts.html pH dependent self assembly of beta-amyloid(10-35) and beta-amyloid(10-35)-PEG3000] ''J. Appl. Cryst.'' '''2000''', 33, 535-539. [http://dx.doi.org/10.1107/S0021889899014387 doi: 10.1107/S0021889899014387]
 * A. V. Smirnov, I. N. Deryabin and B. A. Fedorov [http://scripts.iucr.org/cgi-bin/paper?aj5257 Small-angle scattering: the Guinier technique underestimates the size of hard globular particles due to the structure-factor effect] ''J. Appl. Cryst.'' '''2015''', 48. [http://dx.doi.org/10.1107/S160057671501078X  doi: 10.1107/S160057671501078X]