Abstract
We report the measurement of longitudinal electron diffusion coefficients in liquid argon for electric fields between 100 and 2000V/cm with a gold photocathode as a bright electron source. The measurement principle, apparatus, and data analysis are described. In the region between 100 and 350V/cm, our results show a discrepancy with the previous measurement [1]. In the region between 350 and 2000V/cm, our results represent the world׳s best measurement. Over the entire measured electric field range, our results are systematically higher than the calculation of Atrazhev‐Timoshkin [2]. The quantum efficiency of the gold photocathode, the drift velocity and longitudinal diffusion coefficients in gas argon are also presented.
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