UNIV THREE GORGES,DEPT PHYS,YICHANG 443000,PEOPLES R CHINA
; CHINESE ACAD SCI,GRAD SCH,BEIJING 100039,PEOPLES R CHINA
The problem of removing the spurious components from the vibrations of a polyatomic molecule is discussed in this paper. The scheme proposed in the Comment [R. Lemus et al., Phys. Rev. A 56, 4338 (1997)] for constructing the physical Hamiltonian is a standard method in group theory, but not the simplest one due to multiple applications of Clebsch-Gordan coefficients. A simpler and more general scheme for removing the spurious degree of freedom from both the configuration space and the Hamiltonian is explained in this paper. [S1050-2947(97)04111-5].