The scintillation of liquid argon
T. Heindl, T. Dandl, M. Hofmann, R. Kr\"ucken, L. Oberauer, W. Potzel,, J. Wieser, A. Ulrich
TL;DR
This study provides a detailed spectroscopic analysis of liquid argon’s scintillation properties across a broad wavelength range, revealing emission features and temporal behavior crucial for understanding liquid rare gas detectors.
Contribution
It offers new spectroscopic data and time-resolved measurements of liquid argon scintillation, aiding interpretation of detector signals without wavelength shifters.
Findings
Dominance of the 2nd excimer continuum emission
Identification of additional emission features
Measured time structure of light emission
Abstract
A spectroscopic study of liquid argon from the vacuum ultraviolet at 110 nm to 1000 nm is presented. Excitation was performed using continuous and pulsed 12 keV electron beams. The emission is dominated by the analogue of the so called 2nd excimer continuum. Various additional emission features were found. The time structure of the light emission has been measured for a set of well defined wavelength positions. The results help to interpret literature data in the context of liquid rare gas detectors in which the wavelength information is lost due to the use of wavelength shifters.
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