【摘要】 利用快速傅里叶变换的方法对有限激光脉宽、有限仪器响应时间条件下的量子拍频光谱数据进行拟合，讨论了非理想实验条件对拟合结果的影响，并对 ２２４－２３５ ｎｍ范围内 ＳＯ２分子的量子拍频数据进行了拟合与分析．发现观察到的量子拍频信号是来自 ＳＯ２ Ｃ（１Ｂ２）态与基态高振动态的耦合．更多还原

【Abstract】 We consider the effect of the partially coherent finite duration of excitation laser pulse and instrumental finite response time on the data fit of quantum beats in isolated molecules. By using a Gauss response model we can simulate the effect of both partially coherent laser pulse and instrumental response time. We show that Gauss response has the biggest effect on the first several peaks of the quantum beat decay, but less on the subsequent peaks if quantum beat period is much greater than Gauss response width. This approach is applied to analyze quantum beats of SO2 in the range of 224-235 nm. We find that these quantum beats come from the couple of SO2 C(1B2) state with the high vibrational state of the ground state.更多还原