Alnaser A S, Tong X M, Osipov T, Voss S, Maharjan C M, Ranitovic P, Ulrich B, Shan B, Chang Z, Lin C D, Cocke C L
J. R. Macdonald Laboratory, Physics Department, Kansas State University, Manhattan, KS 66506-2601, USA.
Phys Rev Lett. 2004 Oct 29;93(18):183202. doi: 10.1103/PhysRevLett.93.183202.
We have measured coincident ion pairs produced in the Coulomb explosion of H2 by 8-30 fs laser pulses at different laser intensities. We show how the Coulomb explosion of H2 can be experimentally controlled by tuning the appropriate pulse duration and laser intensity. For laser pulses less than 15 fs, we found that the rescattering-induced Coulomb explosion is dominated by first-return recollisions, while for longer pulses and at the proper laser intensity, the third return can be made to be the major one. Additionally, by choosing suitable pulse duration and laser intensity, we show H2 Coulomb explosion proceeding through three distinct processes that are simultaneously observable, each exhibiting different characteristics and revealing distinctive time information about the H2 evolution in the laser pulse.
我们测量了在不同激光强度下，8 - 30飞秒激光脉冲作用于H₂库仑爆炸过程中产生的符合离子对。我们展示了如何通过调整合适的脉冲持续时间和激光强度，对H₂的库仑爆炸进行实验控制。对于小于15飞秒的激光脉冲，我们发现再散射诱导的库仑爆炸主要由首次返回重碰撞主导，而对于更长的脉冲且在适当的激光强度下，第三次返回可以成为主要的重碰撞。此外，通过选择合适的脉冲持续时间和激光强度，我们展示了H₂库仑爆炸通过三个同时可观测的不同过程进行，每个过程都表现出不同的特征，并揭示了关于H₂在激光脉冲中演化的独特时间信息。
