Schell Felix, Bredtmann Timm, Schulz Claus Peter, Patchkovskii Serguei, Vrakking Marc J J, Mikosch Jochen
Max-Born-Institut für nichtlineare Optik und Kurzzeitspektroskopie, Max-Born-Strasse 2A, 12489 Berlin, Germany.
Sci Adv. 2018 May 4;4(5):eaap8148. doi: 10.1126/sciadv.aap8148. eCollection 2018 May.
Electrons released by strong-field ionization from atoms and molecules or in solids can be accelerated in the oscillating laser field and driven back to their ion core. The ensuing interaction, phase-locked to the optical cycle, initiates the central processes underlying attosecond science. A common assumption assigns a single, well-defined return direction to the recolliding electron. We study laser-induced electron rescattering associated with two different ionization continua in the same, spatially aligned, polyatomic molecule. We show by experiment and theory that the electron return probability is molecular frame-dependent and carries structural information on the ionized orbital. The returning wave packet structure has to be accounted for in analyzing strong-field spectroscopy experiments that critically depend on the interaction of the laser-driven continuum electron, such as laser-induced electron diffraction.
通过强场电离从原子、分子或固体中释放出的电子，可在振荡激光场中加速，并被驱回到其离子核心。随后发生的与光学周期锁相的相互作用，引发了阿秒科学的核心过程。一个常见的假设是为再碰撞电子指定一个单一、明确的返回方向。我们研究了与同一空间排列的多原子分子中两个不同电离连续体相关的激光诱导电子再散射。我们通过实验和理论表明，电子返回概率与分子框架有关，并携带有关电离轨道的结构信息。在分析严重依赖激光驱动连续体电子相互作用的强场光谱实验（如激光诱导电子衍射）时，必须考虑返回波包结构。
