论文标题
C $ _ {70} $的单光子热电子电离
Single-photon hot electron ionization of C$_{70}$
论文作者
论文摘要
气相C $ _ {70} $分子已通过16 eV和70 eV之间的单个能量和速度图成像与离子相吻合的速度图成像测量的电子光谱电离。双离子化和未碎片的物种存在于22 eV及向上的光子能量，并从55 eV中带有三重电荷的离子。光谱的低动能部分用瞬态热电子的热发射来解释。高光子能量的偏差用于确定初始电子平衡时间的值。我们提出了一种通常适用的机制，称为共振电离阴影，用于通过吸收阈值高于阈值的能量光子来创建热电子。
Gas phase C$_{70}$ molecules have been ionized with single photons of energies between 16 eV and 70 eV and the electron spectra measured with velocity map imaging in coincidence with the ions. The doubly ionized and unfragmented species was present at photon energies of 22 eV and up, and triply charged ions from 55 eV. The low kinetic energy parts of the spectra are explained with thermal emission of transient hot electrons. Deviations at high photon energies are used to determine a value for the initial electron equilibration time. We propose a generally applicable mechanism, named Resonance Ionization Shadowing, for the creation of hot electrons by absorption of above-threshold energy photons.
