We report the measurement of longitudinal electron diffusion coefficients in liquid argon for electric fields between 100 and 2000 V/cm with a gold photocathode as a bright electron source. The measurement principle, apparatus, and data analysis are described. Our results, which are consistent with previous measurements in the region between 100 to 350 V/cm [1] , are systematically higher than the prediction of Atrazhev-Timoshkin[2], and represent the world's best measurement in the region between 350 to 2000 V/cm. The quantum efficiency of the gold photocathode, the drift velocity and longitudinal diffusion coefficients in gas argon are also presented.
@article{arxiv.1508.07059,
title = {Measurement of Longitudinal Electron Diffusion in Liquid Argon},
author = {Yichen Li and Thomas Tsang and Craig Thorn and Xin Qian and Milind Diwan and Jyoti Joshi and Steve Kettell and William Morse and Triveni Rao and James Stewart and Wei Tang and Brett Viren},
journal= {arXiv preprint arXiv:1508.07059},
year = {2016}
}