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首页> 外文会议>NATO Advanced Research Workshop on Super-Intense Laser-Atom Physics Sep 24-30, 2000 Han-sur-Lesse, Belgium >DISSOCIATIVE IONIZATION OF FEW-ELECTRON MOLECULES IN INTENSE LASER FIELDS
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DISSOCIATIVE IONIZATION OF FEW-ELECTRON MOLECULES IN INTENSE LASER FIELDS

机译：强激光场中电子分子的解离电离

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摘要

The energy and angular momentum carried by laser radiation readily disturbs the electronic states of molecules. Electronic excitations produced in this interaction are transferred to the nuclear motion and result in rotational heating and large-amplitude molecular vibration of the system often leading to dissociation. With high frequency or high intensity radiation electron ejection becomes a dominant process. Photoionization will occur rapidly over timescales much shorter than vi-brational relaxation times, and the chemical stability of the molecule is destroyed in a Coulomb explosion. Although the molecule in unstable under such conditions, the interaction with the oscillating radiation field gives rise to laser-molecule dressed states which have characteristics of both the laser and the molecular bound and continuum states. The decay of these states, observed by particle energy spectroscopy, is a key to understanding their nature and behaviour. However, even in simple diatomic molecules the complexity of the interactions leads to rich variety in ionic fragment charges and energies which are dependent on laser pulse intensity and duration. Inevitably the analysis of the data produced in experimental studies is obscured by the light intensity and particle density variations over the focal volume of the interaction region. And although a great deal of data has been acquired for large molecules, an understanding of the detailed underlying mechanisms in simple diatomic systems has remained elusive.
机译：激光辐射携带的能量和角动量容易干扰分子的电子状态。在这种相互作用中产生的电子激发被转移到核运动中，并导致旋转加热和系统的大振幅分子振动，通常会导致解离。随着高频或高强度辐射，电子喷射成为主要过程。光电离将在比振动弛豫时间短得多的时间范围内快速发生，并且在库仑爆炸中破坏了分子的化学稳定性。尽管分子在这种条件下处于不稳定状态，但与振荡辐射场的相互作用会产生具有激光，分子束缚态和连续体态特征的激光分子修饰态。通过粒子能谱观察到的这些状态的衰减是了解其性质和行为的关键。然而，即使在简单的双原子分子中，相互作用的复杂性也会导致离子碎片电荷和能量的丰富变化，而离子碎片电荷和能量的变化取决于激光脉冲强度和持续时间。不可避免地，在实验研究中产生的数据的分析被相互作用区域的焦距上的光强度和粒子密度变化所掩盖。而且，尽管已经获得了大分子的大量数据，但是对于简单的双原子系统中详细的潜在机理的理解仍然难以捉摸。

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