甘菊环的含时光电离：飞秒尺度上的光致各向异性
Time-dependent photoionization of azulene: Optically induced anisotropy on the femtosecond scale
摘要：
利用飞秒泵浦-探测光谱测量了甘菊环S2态振动激发能级的光电离截面。在所研究的波长（在泵浦中为349-265 nm）处，瞬态信号表现出两种不同且明确定义的行为：（i）短期（皮秒量级）偏振相关瞬态和（ii）较长（10 ps - 1 ns）时间尺度衰减。这封信的重点是短时间瞬变。与Diau等人22 [J. Chem. Phys. 110（1999）9785]的早期研究相反，我们明确地将快速初始衰减信号分配给由泵浦跃迁产生的初始对准的旋转去相位。
英文摘要：
We measure the photoionization cross-section of vibrationally excited levels in the S2 state of azulene by femtosecond pump-probe spectroscopy. At the wavelengths studied (349-265 nm in the pump) the transient signals exhibit two distinct and well-defined behaviours: (i) Short-term (on the order of a picosecond) polarization dependent transients and (ii) longer (10 ps - 1 ns) time-scale decays. This letter focuses on the short time transient. In contrast to an earlier study by Diau et al.22 [J. Chem. Phys. 110 (1999) 9785.] we unambiguously assign the fast initial decay signal to rotational dephasing of the initial alignment created by the pump transition.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
