中文摘要：

由液体 nitromethane (NM ) 的一个强烈 femtosecond 激光领域劝诱的没有 ₂ 组的结构的变丑分子被解决时间、解决频率的协调的反检测 -- 司烧有强烈的泵激光的拉曼光谱学(汽车) 技术。这里，我们在场分子的排列和变丑的机制。汽车系列和它液体 NM 的快速傅里叶变换系列证明扭力的模式结合的 NO ₂ CN 对称的拉长模式并且没有 ₂ 组经历 ultrafast 有 195 fs 的一松驰时间的结构的变丑。NO 的频率 ₂ 在液体 NM 的扭力的模式(50.8 牵摥？

英文摘要：

The structural deformation of NO2 group induced by an intense femtosecond laser field of liquid nitromethane（NM）molecule is detected by time-and frequency-resolved coherent anti-Stokes Raman spectroscopy（CARS） technique with the intense pump laser. Here, we present the mechanism of molecular alignment and deformation. The CARS spectra and its FFT spectra of liquid NM show that the NO2 torsional mode couples with the CN symmetric stretching mode and that the NO2 group undergoes ultrafast structural deformation with a relaxation time of 195 fs. The frequency of the NO2 torsional mode in liquid NM（50.8±0.3 cm^-1） at room temperature is found. Our results prove the structural deformation of two groups in liquid NM molecule occur simultaneously in the intense laser field.