UNIV THREE GORGES,DEPT PHYS,YICHANG 443000,PEOPLES R CHINA
; CHINESE ACAD SCI,GRAD SCH,BEIJING 100039,PEOPLES R CHINA
; CHINA CTR ADV SCI & TECHNOL,WORLD LAB,BEIJING 100080,PEOPLES R CHINA
; INST HIGH ENERGY PHYS,BEIJING 100039,PEOPLES R CHINA
A boson-realization model and a corresponding q-deformed model are proposed for the vibrations of bent triatomic molecules, where Fermi resonances between stretching and bending vibrations are taken into account. The two models are applied to fit the vibrational energy levels of H2O up to 22 000 cm(-1) with the standard deviations 8.198 and 7.157 cm(-1), respectively.