时间分辨多质量离子成像：使用PImMS相机的飞秒UV-VUV泵浦探测光谱
Time-resolved multi-mass ion imaging: femtosecond UV-VUV pump-probe spectroscopy with the PImMS camera
摘要：
像素成像质谱（PImMS）相机允许3D带电粒子成像测量，其中粒子飞行时间与$(x,y)$位置一起被记录。因此，将PImMS相机耦合到超快泵浦-探测速度图成像光谱装置提供了时间分辨多质量离子成像的途径，具有高计数率和大动态范围，从而允许快速测量复杂的光致碎裂动力学。此外，使用真空紫外波长的探测脉冲允许增强的观察窗口，用于研究具有相对高的电离势的小的多原子分子中的激发态分子动力学。在此，初步的时间分辨多质量成像结果从C $_2$ F $_3$ I光解。实验采用飞秒紫外和真空紫外（160.8~nm和267~nm）泵浦和探测激光脉冲，以证明和探索这种新的时间分辨实验离子成像配置。这些数据表明了这种测量方式的深度和功率，很容易观察到一系列光碎片，以及所制备的激发态上复杂的潜在波包动力学的许多迹象。
英文摘要：
The Pixel-Imaging Mass Spectrometry (PImMS) camera allows for 3D charged particle imaging measurements, in which the particle time-of-flight is recorded along with $(x,y)$ position. Coupling the PImMS camera to an ultrafast pump-probe velocity-map imaging spectroscopy apparatus therefore provides a route to time-resolved multi-mass ion imaging, with both high count rates and large dynamic range, thus allowing for rapid measurements of complex photofragmentation dynamics. Furthermore, the use of vacuum ultraviolet wavelengths for the probe pulse allows for an enhanced observation window for the study of excited state molecular dynamics in small polyatomic molecules having relatively high ionization potentials. Herein, preliminary time-resolved multi-mass imaging results from C$_2$F$_3$I photolysis are presented. The experiments utilized femtosecond UV and VUV (160.8~nm and 267~nm) pump and probe laser pulses in order to demonstrate and explore this new time-resolved experimental ion imaging configuration. The data indicates the depth and power of this measurement modality, with a range of photofragments readily observed, and many indications of complex underlying wavepacket dynamics on the excited state(s) prepared.
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