Energy of stretching

The free energy of stretching a real linear chain in a good solvent has a stronger dependence on size R than the quadratic dependence of the ideal chain ... 

Compounds with low pK will reach the A H+ state with high frequency whereas those with high pK will have to go through many vibrations until the energy of stretching will overcome the threshold to form the ion pair. 

E(r) is the energy of stretching or compressing an individual bond, E 6) is the energy of distorting a bond angle from the ideal,... 

Let us begin with a simple diatomic molecule, for example, HCl. This molecule has three translational and two rotational degrees of freedom. It also has one degree of vibrational freedom, which is the bond stretching. Hooke s law (the harmonic approximation) says that the energy of stretching is given as in Eq. (4.1) ... 

The real situation is considerably more complex. As in the case of a lamellar stmcture, the free energies are determined by a balance between the interfacial tension and the elastic energy of chain stretching. The elastic energy of stretching for the A blocks (similar for the B blocks) can be conveniently evaluated from... 

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