Difference between revisions of "Porod invariant"
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| − | The '''Porod invariant''', is the integral of the | + | The '''Porod invariant''', is the integral of the area of the [[Kratky plot|Kratky curve]]: |
:<math>I_{\mathrm{total}}= \int_0^{\infty} I(q) q^2 \mathrm{d}q </math> | :<math>I_{\mathrm{total}}= \int_0^{\infty} I(q) q^2 \mathrm{d}q </math> | ||
| − | This quantity is independent of concentration, and is proportional to molecular mass. In principle, one can use this method to measure MW. However, the MWs determined in this way are often inaccurate (incorrect [[background]] subtraction, intrinsic flexibility, etc.). | + | This quantity is independent of concentration, and is proportional to molecular mass. In principle, one can use this method to measure MW. However, the MWs determined in this way are often inaccurate (incorrect [[background]] subtraction, voids, intrinsic flexibility, etc.). |
==See Also== | ==See Also== | ||
* [[Porod scattering]] | * [[Porod scattering]] | ||
Latest revision as of 15:15, 11 September 2015
The Porod invariant, is the integral of the area of the Kratky curve:
This quantity is independent of concentration, and is proportional to molecular mass. In principle, one can use this method to measure MW. However, the MWs determined in this way are often inaccurate (incorrect background subtraction, voids, intrinsic flexibility, etc.).
