中国激光, 2004, 31 (s1): 195, 网络出版: 2013-01-29
飞秒强光下的库仑爆炸与离子的角分布研究
Coulomb Explosion and Angular Distribution of Ions in Intense Femtosecond Laser
库仑爆炸 场致电离 飞行时间质谱(TOFMS) 空间准直 协同爆炸 coulomb explosion field ionization time-of-flight mass spectra spatial alignment concerted explosion
摘要
通过对CS2,CH4与CH3OH三种分子在110传,10 13～10 16W·cm-2作用下的离子碎片的飞行时间质谱研究,得到线偏振、圆偏振下的质谱分布.CS2分子在2.2×10 15W/cm2的光脉冲作用下的碎片离子角分布显示了母体分子在库仑爆炸瞬间产生了空间准直(spatial alignment).此外通过对CH4与CH3OH质谱的比较,发现CH4产生的C离子没有双峰结构,由此分析得出CH4在此强度范围内发生库仑协同爆炸,这也与通过计算CS2分子的爆炸碎片平动能(KER)所分析的结果一致.
Abstract
Mass spectras of CS2, CH, and CH3OH were measured with a time-of-flight (TOF) under conditions with laser intensity varying from 1013 W/cm2 to 1016 W/cm2 and a pulse duration of 110 fs. Different mass spectras with linear polarization and circularly polarization were observed The angular distribution of ions of CS2 indicated a spatial alignment from the coulomb explosion of highly charged parent ion. Moreover, the comparision of mass spectra with CH4 and CH3OH does not exhibit a feature of the double peak splited from C ions, which manifestes a concerted explosive process of CH4 This is consistent with the results of CS2 analysed by the method of the kinetic energy release(KER).
马日, 任海振, 陈建新, 李霞, 吴成印, 杨宏, 龚旗煌. 飞秒强光下的库仑爆炸与离子的角分布研究[J]. 中国激光, 2004, 31(s1): 195. MA Ri, REN Hai-zhen, CHEN Jian-xin, LI Xia, WU Cheng-yin, YANG Hong, GONG Qi-huang. Coulomb Explosion and Angular Distribution of Ions in Intense Femtosecond Laser[J]. Chinese Journal of Lasers, 2004, 31(s1): 195.
PDF全文
