Tetrachloroethylene is , a chlorinated molecular liquid. Its four chlorine atoms supply a large chlorine inventory per molecule.
In the Homestake experiment, tetrachloroethylene served as a target for detecting solar neutrinos through a rare chlorine-to-argon nuclear transformation. The solvent's chemical identity determines the target inventory, while the observed conversion is a nuclear process.
[ref]
Nobel Lecture: A half-century with solar neutrinos by Raymond Davis Jr.. Chlorine experiment: perchloroethylene target and argon extraction
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