论文标题
无磁时间分辨的磁圆二色性与脉冲矢量梁
Magnet-Free Time-Resolved Magnetic Circular Dichroism with Pulsed Vector Beams
论文作者
论文摘要
磁圆二色性（MCD）是一种广泛使用的光谱技术，揭示了有关分子几何和电子结构的有价值信息。但是，弱信号和必要的强磁铁对其应用施加了重大限制。我们提出了一种新的方案，通过使用脉冲矢量束（VBS）来克服这些局限性，该方案由纳秒吉赫兹泵和飞秒紫外线探针脉冲组成。借助强纵向电磁场，与使用平面波进行的常规MCD相比，使用脉冲VBS检测到的MCD信号大大增强。此外，改变泵探针时间延迟可以监测分子特性的超快变化。
Magnetic circular dichroism (MCD) is a widely used spectroscopic technique which reveals valuable information about molecular geometry and electronic structure. However, the weak signal and the necessary strong magnets impose major limitations on its application. We propose a novel protocol to overcome these limitations by using pulsed vector beams (VBs), which consist of nanosecond gigahertz pump and femtosecond UV-Vis probe pulses. By virtue of the strong longitudinal electromagnetic fields, the MCD signal detected by using the pulsed VBs is greatly enhanced compared to conventional MCD performed with plane waves. Furthermore, varying the pump-probe time delay allows to monitor the ultrafast variation of molecular properties.
