Kangaparambil Sarayoo, Hanus Václav, Dorner-Kirchner Martin, He Peilun, Larimian Seyedreza, Paulus Gerhard, Baltuška Andrius, Xie Xinhua, Yamanouchi Kaoru, He Feng, Lötstedt Erik, Kitzler-Zeiler Markus
Photonics Institute, Technische Universität Wien, 1040 Vienna, Austria.
Key Laboratory for Laser Plasmas and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.
Phys Rev Lett. 2020 Jul 10;125(2):023202. doi: 10.1103/PhysRevLett.125.023202.
We establish a generalized picture of the phase sensitivity of laser-induced directional bond breaking using the H_{2} molecule as the example. We show that the well-known proton ejection anisotropy measured with few-cycle pulses as a function of their carrier-envelope phases arises as an amplitude modulation of an intrinsic anisotropy that is sensitive to the laser phase at the ionization time and determined by the molecule's electronic structure. Our work furthermore reveals a strong electron-proton correlation that may open up a new approach to experimentally accessing the laser-sub-cycle intramolecular electron dynamics also in larger molecules.
我们以H₂分子为例，建立了激光诱导定向键断裂的相位敏感性的广义图景。我们表明，用少周期脉冲测量的、作为其载波包络相位函数的著名质子喷射各向异性，是一种本征各向异性的幅度调制，该本征各向异性在电离时刻对激光相位敏感，并由分子的电子结构决定。我们的工作还揭示了一种强烈的电子 - 质子相关性，这可能为在更大的分子中通过实验获取激光亚周期分子内电子动力学开辟一条新途径。
