Horke Daniel A, Roberts Gareth M, Lecointre Julien, Verlet Jan R R
Department of Chemistry, University of Durham, South Road, DH1 3LE Durham, United Kingdom.
Rev Sci Instrum. 2012 Jun;83(6):063101. doi: 10.1063/1.4724311.
We present a velocity-map imaging (VMI) setup for photoelectron imaging that utilizes low electric extraction fields. This avoids any complications that could arise from electrostatic interactions between the extraction field and the molecular properties that are probed and has a minimal effect on the trajectory of ions in ion beam experiments. By using an attractive potential supplied to the detector, and keeping the electrodes at ground (zero) potential, we show that fringe fields between the VMI arrangement and the vacuum chamber can be eliminated, which is important in experiments on ions.
我们展示了一种用于光电子成像的速度映射成像（VMI）装置，该装置利用低电场提取。这避免了提取场与所探测的分子特性之间的静电相互作用可能产生的任何复杂情况，并且在离子束实验中对离子轨迹的影响最小。通过向探测器提供一个吸引势，并使电极处于接地（零）电位，我们表明可以消除VMI装置与真空室之间的边缘场，这在离子实验中很重要。
