The geometry of 3,3-dimethyl-1-butene was completely optimized by ab initio
calculations at the HF/6-31G** and HF/6-31G** levels. The quantum-mechanic
al force fields were calculated for the optimized geometries. Scale factors
were determined to correct the HF/6-31G**//HF/6-31G** and HF/6-31G**//HF/6
-31G* quantum-mechanical force fields. The assignments of some experimental
vibrational bands of 3,3-dimethyl-1-butene were revised.