and 516.6 nm) and possibly C3 (404.8 nm) was also identified. The existence of the C3 emission peak at 405 nm was also observed in the microplasma decomposition of FeCp2. The lines from neutral N2 are likely due to the background pressure during the experiments. Note that the excitation threshold energies for N2 seen at 336.7 and 380.1 nm is 11.0 35 and 11.1 eV respectively and that N II is observed at all investigated plasma powers. These results are in line with our previous results that the electron energy significantly increases when FeCp2 is present in the vacuum chamber. The Fe I corresponds to the emission from neutral iron, suggesting that FeCp2 is decomposed in the plasma by breaking the Fe-Cp bonds, possibly through an electron dissociation reaction, according to reaction 1.