Attosecond Electron Dynamics

在这个由化学学部化学结构、动力学和机制项目资助的项目中，加州大学伯克利分校的Stephen Leone教授将使用激光产生的软x射线阿秒脉冲来测量原子和小分子的阿秒化学动力学。在泵浦-探针结构中，一个可见或紫外短脉冲将电离或电子激发原子或分子，第二个阿秒x射线脉冲将通过在特定原子中可到达的核心能级跃迁的瞬态吸收来探测电子态动力学。将测量类波传播的电子时标。该项目将研究高场电离和非玻恩-奥本海默效应。更广泛的影响包括教育学生分子动力学、光学的x射线探测原理，以及载波包络相位稳定等尖端激光原理。

In this project funded by the Chemical Structure, Dynamics and Mechanisms program of the Chemistry Division, Professor Stephen Leone of the University of California at Berkeley will employ laser-produced soft x-ray attosecond pulses to measure attosecond chemical dynamics in atoms and small molecules. In a pump-probe configuration, one short pulse in the visible or ultraviolet will ionize or electronically excite an atom or molecule, and a second attosecond x-ray pulse will probe electronic state dynamics by transient absorption of the core level transitions accessible in specific atoms. Electronic timescales for wave-like propagation will be measured. The project will investigate high field ionization and non-Born-Oppenheimer effects. Broader impacts involve the education of students in the principles of x-ray detection for molecular dynamics, optics, and cutting-edge laser principles such as carrier-envelope phase stabilization.