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An alternative measure of the size of a polymer chain is provided by its
radius of gyration ,
which may be measured by light scattering
experiments . It is defined by

(1.42) 

(1.43) 
It measures the average squared distance to the centre of gravity
.
A little manipulation yields
R_{g}^{2} 
= 



= 



= 



= 



= 

(1.44) 
It is clear that expressions for R_{g} can easily be obtained using methods
similar to the ones of the previous section.
Next: Some results for polyethylene
Up: The Rotational Isomeric State
Previous: The mean square endtoend
W.J. Briels