论文部分内容阅读
分别利用810,405和270nm飞秒激光对NO2的解离和电离现象进行了实验研究.结果表明在3种波长下NO2+/NO+比率与场强无关,而与波长有关,即长波长有利于产生母体离子,较短波长易产生碎片离子;碎片离子来源于场致电离产生的母体离子进一步解离;实验中所有碎片离子峰形都显示解离过程释放出很小的平动能.和激光强度相比,激光波长在多原子分子强场电离解离过程中更为重要.
The dissociation and ionization phenomena of NO2 were investigated by using 810, 405 and 270nm femtosecond laser respectively.The results showed that the NO2 + / NO + ratio was independent of the field intensity at 3 wavelengths and wavelength dependent, ie, the long wavelength favored the generation of parent ion , The shorter wavelength easy to produce fragment ions; fragment ions from the field ionization of the parent ion to further dissociation; all the fragment ion peak shape in the experiment showed that the dissociation process released a small translational energy.Compared with the laser intensity, The laser wavelength is more important in the process of ionization and dissociation of polyatomic molecules.