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Hsu, Y.-C.; Lin, J.J.-M.; Papousek, D.; Tsai, J.-J., The low-lying bending vibrational levels of the CCH (X 2«SIGMA»+) radical studied by laser-induced fluorescence, J. Chem. Phys., 1993, 98, 9, 6690, https://doi.org/10.1063/1.464761 . [all data]