The infrared spectrum of the Iron carbonyl radical FeCO generated by the 193 nm excimer laser photolysis of iron pentacarbonyl Fe(CO)(5) was observed by time-resolved diode laser spectroscopy. The 85 lines, mostly observed as triplets split by the electron spin-spin interaction, were assigned to the nu(1) (CO stretch) band of FeCO. The electronic ground state of FeCO was confirmed experimentally to have (3) Sigma(-) symmetry. Molecular constants in the ground and nu(1) vibrational states were derived from an analysis of the infrared spectrum combined with pure rotational lines in the lowest spin component Omega=0 observed by Fourier transform microwave (FTMW) spectroscopy. The rotational and centrifugal distortion constants in the mound state were determined as B-0=4364.266(55) MHz and D-0=1.378(25) kHz, where the figures in parentheses are standard errors to be attached to the last digit. The spin-spin and spin-rotation coupling constants are lambda(0)=663.1(40) GHz and gamma(0)=974(27) MHz, respectively. The origin of the nu(1) vibrational band determined is 1946.470 60(12) cm(-1), which is consistent with the value derived from photodetachment spectroscopy of the FeCO- anion. The collisional quenching rate of FeCO by Fe(CO)(5) was measured to be 1.13(4)x10(-10) cm(3) molec(-1) s(-1) by a kinetic study.