Scaling analysis parameters in 3D-focusing velocity map imaging. (1st May 2023)

• Record Type: Journal Article
• Authors: Wu, Ruichang; Ding, Bocheng; Feng, Yunfei; Wu, Kefei; Jin, Xin; Liu, Xiao-Jing
• Is Part Of: Measurement science & technology. Volume 34:Number 5(2023)
• Publication Date: 2023-05-01
• Subjects: velocity map imaging -- 3D focusing -- scaling parameter; Physical measurements -- Periodicals; Scientific apparatus and instruments -- Periodicals; Equipment and Supplies -- Periodicals; Science -- instrumentation -- Periodicals; Technology -- instrumentation -- Periodicals; Mesures physiques -- Périodiques; Physical measurements; Scientific apparatus and instruments; Periodicals; 502.87
• DOI: 10.1088/1361-6501/acb72e
• Languages: English
• ISSNs: 0957-0233

Abstract

Abstract: Velocity map imaging spectrometer is a powerful tool for measuring the two-dimensional momenta of charged particles in dissociative photoionization processes. By combining a time-position sensitive detector with a three-dimensional (3D) source focusing mode, 3D momentum can be measured at a much higher resolution. However, due to the side effects of the non-uniform electric field in this mode, the retrieval of the 3D momentum becomes complicated. Here, we describe a method to retrieve the 3D momentum from the time of flight and the position at a numerical accuracy better than 0.1%, much below the best achievable relative energy resolution of 1% in the reported experiments. The method is consistently tested on simulated data, including ions with different masses and charges. Moreover, a scaling relationship is established among them.