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Sharp-Williams, E.N.; Roberts, M.A.; Nesbitt, D.J., High resolution slit-jet infrared spectroscopy of ethynyl radical: 2«PI»--2«SIGMA»+ vibronic bands with sub-Doppler resolution, J. Chem. Phys., 2011, 134, 6, 064314, https://doi.org/10.1063/1.3532088 . [all data]