We present a method to measure the kinetic energy of electrons emitted upon ion impact via their time-of-flight. Pulsed beams of H⁺, D₂⁺, He⁺ and Ne⁺ ions with velocities between 0.4 and 3.5 a.u. are transmitted through thin, self-supporting carbon and gold foils. Transmitted ions and secondary electrons are detected with a position-sensitive detector behind the sample, and their respective energies are determined via their flight times. A coincidence criterion can be applied in the acquisition software. Measured electron energies range between 10 and 400 eV. Above ion velocities of 1 a.u. the most probable electron energy scales with ion velocity pointing towards a kinetic emission mechanism. At lower ion velocities, the electron energy stays constant and lies above the maximum energy transfer possible in a classical binary collision between ion and electron. Potential applications and technical challenges of measuring electron energies and yields with a time-of-flight approach are discussed.

我们提出一种方法来测量通过离子的飞行时间在离子撞击下发射的电子的动能。H ⁺，D ₂ ⁺，He ⁺和Ne ^+的脉冲束速度在0.4到3.5 au之间的离子通过薄的自支撑碳和金箔传输。透射离子和二次电子通过位于样品后面的位置敏感检测器进行检测，并通过其飞行时间确定其各自的能量。符合标准可以应用在采集软件中。测得的电子能量范围为10至400 eV。离子速度高于1 au时，最可能的电子能量尺度与离子速度指向动力学发射机理有关。在较低的离子速度下，电子能量保持恒定并高于离子与电子之间经典的二元碰撞中可能发生的最大能量转移。讨论了使用飞行时间方法测量电子能量和产率的潜在应用和技术挑战。