LOREN G. HEPLER,JOHN R. SWEETAND RICHARD A. JESSER
304
For the case considered, al = a2 = log”, B = b2, and the average of the square of the dipole moment is
A = (16/9)
p2
=
SO” d e ) SO”
exp[- V(B)/RTldB (’)
exp[ - V(S)/RTldB
Substitute into (7)
=
SO”
butadiene,28 which was 5 kcal., although it is expected t o be larger due t o the enhanced interaction between halogen atoms as contrasted to the hydrogen atoms. The ratio of the number of molecules in the trans configuration to those in the cis configuration is given by N t r a n i / N c i s = exp( -a) = 12.9, while the ratio of the number of molecules Nt/Nc,with 0 in the interval 0 0 ~ / 2 to , those with 0 in the interval n/2 6 0 nisgiven by
