Following the initial report of the detection of fundamental transitions of all nine vibrational modes of the vinyl radical [Letendre, L.; Liu, D.-K.; Pibel, C. D.; Halpern, J. B.; Dai, H.-L. J. Chem. Phys. 2000, 112, 9209] by time-resolved IR emission spectroscopy, we have re-examined the assignments of the vibrational modes through isotope substitution. Precursor molecules vinyl chloride-d(3), vinyl bromide-d(3), and 1,3-butadiene-d(6) are used for generating vibrationally excited vinyl-d(3) through 193 nm photolysis. The nondeuterated versions of these molecules along with vinyl iodide and methyl vinyl ketone are used as precursors for the production of vinyl-h(3). IR emission following the 193 nm photolysis laser pulse is recorded with nanosecond time and similar to 8 cm(-1) frequency resolution. A room-temperature acetylene gas cell is used as a filter to remove the fundamental transitions of acetylene, a photolysis product, in order to reduce the complexity of the emission spectra. Two-dimensional cross-spectra correlation analysis is used to identify the emission bands from the same emitting species and improve the SIN of the emission spectra. Isotope substitution allows the identification of several low-frequency vibrational modes. For C2H3, the assigned modes are the nu(4) (CC stretch) at 1595, nu(5) (CH2 symmetric bend) at 1401, nu(6) (CH2 asymmetric + alpha-CH bend) at 1074, nu(8) (CH2 + alpha-CH symmetric out-of-plane (oop) bend) at 944, and nu(9) (CH2 + alpha-CH asymmetric oop bend) at 897 cm(-1). For C2D3, the modes are the nu(5) (CD2 symmetric bend) at 1060, nu(6) (CD2 asymmetric + alpha-CD bend) at 820, and nu(8) (CD2 + alpha-CD symmetric oop bend) at 728 cm(-1).