INST HIGH ENERGY PHYS,BEIJING 100039,PEOPLES R CHINA
; UNIV THREE GORGES,DEPT PHYS,YICHANG 443000,PEOPLES R CHINA
; CHINESE ACAD SCI,GRAD SCH,BEIJING 100039,PEOPLES R CHINA
An algebraic model of boson realization is proposed to study the vibrational spectra of a tetrahedral molecule, where ten sets of boson creation and annihilation operators are used to construct the Hamiltonian with Td symmetry. There are two schemes in our model. The first scheme provides an eight-parameter fit to the published experimental vibrational eigenvalues of methane with a root-mean-square deviation 11.61 cm(-1) The second scheme, where the bending oscillators are assumed to be harmonic and the interactions between the bending vibrations are neglected, provides a five-parameter fit with a root-mean-square deviation 12.42 cm(-1).