Hankin SM, Villeneuve DM, Corkum PB, Rayner DM
Femtosecond Science Program, Steacie Institute for Molecular Science, National Research Council, 100 Sussex Drive, Ottawa, Ontario, Canada K1A 0R6.
Phys Rev Lett. 2000 May 29;84(22):5082-5. doi: 10.1103/PhysRevLett.84.5082.
We use a series of 23 organic molecules to study ionization of complex media caused by their interaction with intense 40 fs, 0.8 &mgr;m pulses. All molecules reach saturated ionization at higher intensities than would be expected for atoms of the same ionization potential, reminiscent to what has been reported for dielectric breakdown with femtosecond pulses. Dependence of the ionization rate on the alignment of the molecule with the laser field is ruled out as the cause of the high saturation intensities. All molecules allow a significant range of intensities between the region of approximately 100% ionization and before the second and subsequent electrons are removed.
我们使用一系列23种有机分子来研究它们与40飞秒、0.8微米强脉冲相互作用所引起的复杂介质的电离。所有分子在比具有相同电离势的原子预期更高的强度下达到饱和电离，这与用飞秒脉冲进行介电击穿的报道情况相似。电离速率对分子与激光场取向的依赖性被排除作为高饱和强度的原因。所有分子在大约100%电离区域与第二个及后续电子被移除之前的区域之间都允许有显著的强度范围。
