论文标题
评估脉冲离子束诱导的电子发射：飞行时间方法
Assessing electron emission induced by pulsed ion beams: a time-of-flight approach
论文作者
论文摘要
我们提出了一种测量通过飞行时间在离子撞击时发出的电子的动能的方法。 H $^{+} $，D $ _2^{+} $的脉冲光束，He $^{+} $和Ne $^{+} $ ions，速度为0.4至3.5a.u。通过薄的自支撑碳和金箔传播。在样品后面的位置敏感探测器检测到传输离子和二级电子，其各自的能量是通过其飞行时间确定的。巧合标准可以应用于采集软件。测得的电子能量在10至400 eV之间。高于1 a.u.的离子速度以离子速度指向动力学发射机制的最可能的电子能量尺度。在较低的离子速度下，电子能保持恒定，并且位于离子和电子之间的经典二进制碰撞中的最大能量转移之上。讨论了通过飞行时间方法测量电子能量和产量的潜在应用和技术挑战。
We present a method to measure the kinetic energy of electrons emitted upon ion impact via their time-of-flight. Pulsed beams of H$^{+}$, D$_2^{+}$, 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 criterium 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.
