Gong Ruolin, Li Yang, Pan Shengzhe, Tong Jihong, Mao Yijia, Zhang Zhaohan, Jiang Wenyu, Lu Peifen, Ueda Kiyoshi, He Feng, Wu Jian
State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China.
Key Laboratory for Laser Plasmas (Ministry of Education) and School of Physics and Astronomy, Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China.
Sci Adv. 2025 Jun 13;11(24):eadw5917. doi: 10.1126/sciadv.adw5917.
Resolving partial waves, including their amplitudes and phases, is crucial for understanding the intricate structure and dynamics of the photoelectron released. However, the knowledge is limited because of the complexities of the multiphoton interactions with molecules in the nonperturbative regime. Here, we address these challenges using an orthogonal two-color (OTC) scheme, which combines different photon energies and polarizations of the laser fields to produce characteristic photoelectron angular distributions (PADs) that vary with the laser phase. By analyzing the phase-dependent PADs, the partial waves, including their individual amplitudes and phases, involved in the nondissociative and dissociative single ionization of H are unambiguously resolved. In addition, the interaction phases accumulated during the absorption of multiple photons of different polarizations are revealed. The OTC scheme works as a powerful tool to achieve a partial-wave decomposition of the photoelectron wave packet launched via multiphoton ionization and explore attosecond electron dynamics in strong laser fields.
解析包括振幅和相位在内的分波，对于理解光电子释放的复杂结构和动力学至关重要。然而，由于在非微扰区域中多光子与分子相互作用的复杂性，这方面的知识有限。在此，我们使用一种正交双色（OTC）方案来应对这些挑战，该方案结合了激光场的不同光子能量和偏振，以产生随激光相位变化的特征光电子角分布（PADs）。通过分析与相位相关的PADs，明确解析了参与氢的非解离和解离单电离过程的分波，包括它们各自的振幅和相位。此外，还揭示了在吸收不同偏振的多个光子过程中积累的相互作用相位。OTC方案是一种强大的工具，可实现通过多光子电离发射的光电子波包的分波分解，并探索强激光场中的阿秒电子动力学。
