Abstract
The pure rotational spectrum of the iron-carbonyl radical FeCO produced by a dc discharge of iron pentacarbonyl Fe(CO)5 was observed in the millimeter-wave (MMW) region. Ten rotational transitions, split into triplets by the electron spin–spin interaction, were assigned to the electronic ground state of FeCO, definitely confirming that the FeCO radical has 3Σ− symmetry. Molecular constants in the ground state were derived from an analysis of the MMW spectrum combined with the rotational lines in the lowest spin component Ω=0 observed by Fourier transform microwave (FTMW) spectroscopy. The rotational and centrifugal distortion constants were determined as B0=4363.883 42(40) MHz and D0=1.217 99(84) kHz. The spin–spin coupling constant and its centrifugal distortion correction are λ0=684.470(51) GHz and λD=−258.08(17) kHz, respectively, and the spin–rotation coupling constant is γ0=−1127.80(35) MHz, where the figures in parentheses are standard errors to be attached to the last digit.
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