Femtosecond quantum beam pulse radiolysis

为了在亚皮科或皮科康系统中测试超快的化学反应的目的，我们构建了一个新的泵和探针系统，并进行了实验。新的泵和探测器系统的考虑因素是一个100 fs 0.3 TW激光器带有被动模式锁定的激光振荡器，一个激光光电枪，其中可以产生低发射电子束。在泵和探测实验之前，系统的性能是激光器的脉冲持续时间，即第三个更高的谐波，即白光，激光的能量，系统的稳定性和每个组件的定时抖动都被调查。同样地，诊断学的皮肤是为了衡量时间抖动已经得到了改善。在泵和探测实验中，水中瞬态物种的化学反应被研究了。作为一个样品， millipore水和1 M HClO 4在1.8厘米的D1 t细胞被选定并在eaq-和质子被测量的衰退。带有质子的反应也可以被观察到，我们已经完成了时间解析X射线差分实验，这也是一种泵和探测分析。laser pulse excites the lattice vibration of the target （pump） and picosecond laser plasma X-ray （LPX） is differracted by the target （probe）。作为最初的实验，静态差异图像首先出现。Picosecond LPX使用50 fs 12 TW激光器生产，并获得了获得的Ge、GaAs和硅的差异图像。

For the purpose of investigating ultra fast chemical reactions in a subpico- or picosecond regime, we constructed a new pump and probe system and performed the experiment. The new pump and probe system consists of a 100 fs 0.3TW laser with passive mode-locked laser oscillator, a laser photocathode rf-gun which can generate a low emittance electron beam. Before the pump and probe experiment, the performance of the system such as a pulse duration of the laser, that of the third higher harmonies, that of white light, energy of the laser, the stability of the system and timing jitters of each components were investigated. Simultaneously the diagnostics skins to measure the timing jitter had been improved. In the pump and probe experiment, chemical reactions of transient species in a water was studied. As a sample, millipore water and 1M HClO4 in the 1.8 cmィイD1tィエD1 cell were selected and the decay of concentrations of eaq- and proton were measured. The reaction of eaq-with proton could be also observed.We performed time-resolved X-ray diffraction experiment, which is also a kind of pump and prove analysis. The laser pulse excites the lattice vibration of the target (pump) and picosecond laser plasma X-ray (LPX) is diffracted by the target (probe). As the preliminary experiment, the static diffraction images were obtained first. Picosecond LPX was produced using 50 fs 12 TW laser and the diffraction images of Ge, GaAs and Si were obtained.