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Laser-induced Alignment and Coulomb Explosion of CO2
Cheng-yin Wu*, Hong-yan Jiang, Zhi-feng Wu, Qi-huang Gong
State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, China
Abstract:
Dynamic processes of CO2 are experimentally studied in intense femtosecond laser fields with laser intensity varying from 1×1013W/cm2 to 6×1014W/cm2. When the laser intensity is below the ionization threshold, a coherent rotational wave-packet is formed for CO2 at room temperature through nonadiabatic rotational excitation. The evolution of the wave-packet leads to transient alignment. The field-free alignment revives periodically after the laser pulse is over. The revival structure can be modified by a second laser pulse for the rotational wave-packet through precisely adjusting the time delays between the two laser pulses. When the laser intensity excesses the ionization threshold, ionization and Coulomb explosion occur. The atomic ions Cm+ (m=1-3) and On+ (n=1-3) observed in the experiment exhibit highly anisotropic angular distributions relative to the laser polarization. Using two linearly polarized laser pulses with crossed polarization, we conclude that the anisotropic angular distribution results from dynamic alignment, in which the rising edge of the laser pulse aligns the neutral CO2 along the laser polarization direction prior to ionization.
Key words:  Rotational wave-packet, Field-free alignment, Coulomb explosion
FundProject:
Laser-induced Alignment and Coulomb Explosion of CO2
吴成印*, 姜洪岩, 吴志峰, 龚旗煌
人工微结构和介观物理国家重点实验室,北京大学物理学院,北京100871
摘要:
实验研究了CO2分子在飞秒强激光脉冲作用下的动力学过程,包括分子取向,隧穿电离和库仑爆炸,激光强度从1×1013W/cm2变化到6×1014W/cm2. 当激光强度小于分子的电离阈值时,CO2分子的非绝热转动激发形成一个相干转动波包,波包演化导致分子沿激光电场方向取向. 激光脉冲结束后,分子取向可以周期性地再现,利用另一束激光可以对取向结构进一步进行修饰. 当激光强度大于分子
关键词:  转动波包,无外场取向,库仑爆炸
DOI:10.1088/1674-0068/22/06/571-576
分类号: