ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 49, Number 6
JKCSEZ 49(6)
December 20, 2005 

The cumulant analysis (CA) method was expanded to tetrahedrally symmetric molecules. In conjunction with real time gas electron diffraction (GED/RT), the method was applied to study the molecular structural parameters of CF₄ over the temperature range from 298 to 673K. The molecular parameters of CF₄ by the cumulant analysis method were compared with those from the simplified cumulant analysis (SCA) and traditional method. The value of the equilibrium distance (r_e) for bonded distance C-F was used as a criterion for the accuracy of anharmonic force fields obtained from high resolution spectroscopy. The accuracies of five different anharmonic forces fields have been tested by using CA. The equilibrium structural parameters of CF₄ were obtained by CA and SCA. The equilibrium distances (r_e) were 131.51(4) pm by SCA for C-F of CF₄ at 298K.