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CN and C2 formation mechanisms in fs-laser induced breakdown of nitromethane in Ar or N2 atmosphere

Y.L. Zhao,G.G. Li,H.M. Hou,J.C. Shi,S.N. Luo

We investigate atomic and molecular emission of laser-ablated nitromethane in an Ar or N 2 buffer gas, with fs laser-induced breakdown spectroscopy. The electronic bands of CN, C 2 , and NH molecules and the atomic transition lines of C I, N I, and H α are identified. The time series of the emissions are obtained, and the formation mechanisms of CN and C 2 are deduced. The CN violet system, the B 2 Σ + -X 2 Σ + (0-0) band, is chosen to extract plasma temperature from the experimental spectra.