The Young's moduli of the linear chain polymers, polyethylene and six polyf
luoroethylenes, constrained to the planar conformation, are calculated by m
eans of the local density approximation (LDA) using the Perdew-Zunger (PZ)
correlation potential and a linear combination of Gaussian-type orbitals (L
CGTO). (C) 2000 Published by Elsevier Science Ltd.