Kuhn step number

The theoretical framework is economic in that the number of free parameters required to make predictions is very limited as well as the Kuhn step length b. 

An effective freely jointed chain of contour length L would then contain Nx = L/bx rigid finks, each of length bx, and Nx is the number of Kuhn steps in the chain (Semenov and Khokhlov 1988). Hence,... 

Where is the number of effective Kuhn steps, and the bk is tlie length of each Kuhn step. The gyration radius of Rg ... 

Since a Gaussian chain is a freely jointed chain of large number of Kuhn steps without excluded volume interactions, it does not describe any chain statistics... 

In the simplest possible model for an Ideal chain, the bonds between atoms In the backbone are treated as vectors connecting volumeless points which do not Interact. Such a model chain is depicted in fig. 5.2 the (fluctuating) distance between the end points is denoted as r. If, moreover, any orientation between two consecutive bonds is assumed to have the same probability, the conformational properties of long chains can be described by the universal random-Jlight model, first introduced by Kuhn l. Let the chain have N randomly oriented bonds, each of length t. Such a model chain contains IV + 1 backbone atoms. When these bonds are assumed to be fully Independent of each other, the conformation resembles the trajectory of a particle diffusing under the action of a random force, for which the solution is well known -S- ). The mean square displacement [Pg.614]

---