利用少周期红外激光器进行超快动态化学成像的潜力
Potential for ultrafast dynamic chemical imaging with few-cycle infrared lasers
摘要：
研究了几个周期的强红外激光脉冲产生的光电子能谱。通过聚焦于后向再散射的高能光电子的角分布，我们表明，可以提取目标离子被自由电子的精确微分弹性散射截面。由于自由电子的入射方向和能量可以通过操纵激光的偏振、强度和波长而容易地改变，这些提取的弹性散射截面与更先进的反演算法相结合，可以用于重建分子的有效单散射势，从而开辟了使用几个周期的红外激光器作为强大的桌面工具来成像化学和生物变化的可能性，具有所需的前所未有的时间和空间分辨率。
英文摘要：
We studied the photoelectron spectra generated by an intense few-cycle infrared laser pulse. By focusing on the angular distributions of the back rescattered high energy photoelectrons, we show that accurate differential elastic scattering cross sections of the target ion by free electrons can be extracted. Since the incident direction and the energy of the free electrons can be easily changed by manipulating the laser's polarization, intensity, and wavelength, these extracted elastic scattering cross sections, in combination with more advanced inversion algorithms, may be used to reconstruct the effective single-scattering potential of the molecule, thus opening up the possibility of using few-cycle infrared lasers as powerful table-top tools for imaging chemical and biological transformations, with the desired unprecedented temporal and spatial resolutions.
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