The potential energy surface of the neutral form of gamma-aminobutyric
acid was investigated by means of ab-initio 4-31G SCF calculations. G
eometries, energies, and selected wave numbers of al 62 symmetry uniqu
e local minima are reported. Intramolecular interactions and all react
ions, which involve the intramolecular hydrogen bond, are discussed an
d compared with those present in the homologues beta-alanine and glyci
ne.