Phase transition from u ( 3 ) to o ( 4 ) in the model is also analyzed in detail . finally , the vibron model is used to describe diatomic molecules . fitting to vibrational energy spectra is performed using both transitional theory and dynamical symmetry limit theory within the same framework 利用建立在該嚴(yán)格解基礎(chǔ)上的計(jì)算程序討論了u ( 4 )振動(dòng)子模型的過(guò)渡區(qū)理論對(duì)雙原子分子振動(dòng)能譜的描述,并與o ( 4 )極限的計(jì)算結(jié)果做了比較。