November 11, 2010Open Access
Measurement of the two-photon absorption cross-section of liquid argon with a time projection chamber
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Abstract
Abstract. This paper reports on laser induced multiphoton ionization at 266 nm of liquid Argon in a Time Projection Chamber (LAr TPC) detector. The electron signal produced by the laser beam is a formidable tool for the calibration and monitoring of the next generation large mass LAr TPCs. The detector we have designed and tested allowed us to measure the two-photon absorption cross-section of LAr with unprecedented accuracy and precision: σex = (1.24 ± 0.10stat ± 0.30syst) · 10−56 cm4s. ar X iv