标题： 用于超快光解研究的质谱选择离子-分子团簇束装置 显示英文标题

标题： Mass-selected Ion-molecule Cluster Beam Apparatus for Ultrafast Photofragmentation Studies

摘要： 我们描述了一种装置，用于研究由激光激发和电子从碘化物转移到中性分子引发的离子-分子团簇的碎片化。 该装置包括一个生成离子-分子团簇的源，一个飞行时间（TOF）质谱仪和一个质量过滤器以选择所需的阴离子，以及一个线性加二次反射镜质谱仪，在飞秒激光激发团簇后区分碎片阴离子。 然后，碎片中性和阴离子被两个通道电子倍增管探测器捕获。 通过测量光碎片： I$^-$，CF$_3$I$^-$以及使用波长为266 nm的飞秒紫外激光脉冲从离子-分子团簇CF$_3$I$\cdot$I$^-$的光激发中产生的中性粒子来测试装置性能。 实验结果与我们的基态和激发态电子结构计算以及现有的结果和计算进行了比较，特别关注光激发和光解离的动力学。 显示英文摘要

摘要： We describe an apparatus to study the fragmentation of ion-molecule clusters triggered by laser excitation and transfer of an electron from the iodide to the neutral molecule. The apparatus comprises a source to generate ion-molecule clusters, a time-of-flight (TOF) spectrometer and a mass filter to select the desired anions, and a linear-plus-quadratic reflectron mass spectrometer to discriminate the fragment anions after the femtosecond laser excites the clusters. The fragment neutrals and anions are then captured by two channeltron detectors. The apparatus performance is tested by measuring the photofragments: I$^-$, CF$_3$I$^-$ and neutrals from photoexcitation of the ion-molecule cluster CF$_3$I$\cdot$I$^-$ using femtosecond UV laser pulses with a wavelength of 266 nm. The experimental results are compared with our ground state and excited state electronic structure calculations and the existed results and calculations, with particular attention to the dynamics of the photoexcitation and photodissociation.