Mini-symposium: Spectroscopy at Large-scale Facilities
Abstract
In 1997 Eppink and Parker introduced velocity map imaging (VMI) based on the ion imaging technique developed by Chandler and Houston. This method has been as a high-resolution tool to study the detailed dynamics of chemical or physical processes. This approach can measure the momenta and angular distributions of charged particles (ions/electrons) released in these processes and provide detailed information about the potential energy surfaces. Over the years, this technique has been evolving; now it can do direct three-dimensional measurements with multi-hit capability. In this work, we report further improvement to the 3D-VMI setup. With the conventional digitizers employed previously replaced by a low-cost USB oscilloscope, VMI has become more cost-effective, simpler and even portable. The performance of this new VMI apparatus was characterized in a study of laser desorption ionization of 2,5-dihydroxybenzoic acid.
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