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在室温下，使用皮秒时间分辨ＣＡＲＳ测量了乙、丙苯的ν１２环振动模的退相动力学．观察到了正 丙苯的两种构像的ν１２模的不同退相行为 乙苯和异丙苯的ν１２模的退相服从单指数衰减，而正丙苯的ν１２环 模的退相却是振荡衰减的．这种振荡衰减被归咎于正丙苯的ｔｒａｎｓ和ｇａｕｃｈｅ构像的ν１２环振动模之间的量子 拍．乙、丙苯的ν１２环振动模的退相时间常数被给出，并极大地受烷基链的构像、结构和长度的影响．
At room temperature, the kinetics of the ν12 ring vibration modes of β, β-benzene were measured using picosecond time-resolved CARS. The different retarded behavior of the ν12 mode of the two conformers of n-propylbenzene was observed. The extinction of the ν12 mode of ethylbenzene and cumene obeyed a single exponential decay, whereas the ν12 mode of n-propylbenzene exhibited phase decay of. This oscillation decay is attributed to the quantum beat between the ν12-ring vibrational modes of trans and gauche conformations of n-propylbenzene. The deactivation time constants for the ν12 ring vibration modes of beta and c-benzene are given and are greatly influenced by the conformation, structure and length of the alkyl chain.