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The ionization signals in the liquid argon of the ATLAS electromagneticcalorimeter are studied in detail using cosmic muons. In particular, the drifttime of the ionization electrons is measured and used to assess the intrinsicuniformity of the calorimeter gaps and estimate its impact on the constant termof the energy resolution. The drift times of electrons in the cells of thesecond layer of the calorimeter are uniform at the level of 1.3 % in the barreland 2.8 % in the endcaps. This leads to an estimated contribution to theconstant term of (0.29 +0.05 -0.04) % in the barrel and (0.54 +0.06 -0.04) % inthe endcaps. The same data are used to measure the drift velocity of ionizationelectrons in liquid argon, which is found to be 4.61 +- 0.07 mm/\mu s at 88.5 Kand 1 kV/mm.

Drift Time Measurement in the ATLAS Liquid Argon Electromagnetic Calorimeter using Cosmic Muons