Dissociation of NO_2 in femtosecond intense fields  

作　　者：ZHU Jingyi GUO Wei WANG Yanqiu WANG Li 

机构地区：[1]State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, China [2]Graduate School of the Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Chinese Science Bulletin》2006年第10期1185-1190,共6页

摘　　要：Experimental investigations on the dis-sociation and ionization processes of NO2 in intensefields at wavelengths of 810, 405 and 270 nm, arepresented. The ratios of NO +2 /NO + are found to beindependent of the laser intensity at these threewavelengths, but show strong dependence on thewavelengths. Longer wavelength produces a largerparent-ion yield in comparison with 405 nm. Peakprofiles of all the fragment ions clearly show little ki-netic energy releasing during the dissociation. Frag-ment ions are suggested to be produced from disso-ciation of the field ionized parent ions. Our resultsindicate that laser pulse wavelengths are the mostimportant parameters in ionization-fragmen- tationprocess of polyatomic molecules in intense field otherthan the laser intensity.Experimental investigations on the dissociation and ionization processes of NO2 in intense fields at wavelengths of 810, 405 and 270 nm are presented. The ratios of NO^＋2/NO^＋ are found to be independent of the laser intensity at these three wavelengths, but show strong dependence on the wavelengths. Longer wavelength produces a larger parent-ion yield in comparison with 405 nm. Peak profiles of all the fragment ions clearly show little kinetic energy releasing during the dissociation. Fragment ions are suggested to be produced from dissociation of the field ionized parent ions. Our results indicate that laser pulse wavelengths are the most important parameters in ionization-fragmen- tation process of polyatomic molecules in intense field other than the laser intensity.

关 键 词：毫微微秒激光器 激光强度 场感应电离 场感应离解 

分 类 号：TN24[电子电信—物理电子学]