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Plasma emission of liquid benzene (C 6 H 6 ) and carbon disulfide (CS 2 ) have been studied by using the laser-induced breakdown spectroscopy (LIBS) technique in air. Atomic lines of carbon, hydrogen, sulfur, nitrogen, and oxygen and molecular emissions of CN and C 2 have been identified. The formation mechanism of C 2 and CN molecules has been discussed. The combustion process and high mole fraction of hydrogen in benzene caused a decreasing atomic line intensity of oxygen and an increasing atomic line intensity of hydrogen with respect to the CS 2 and air. Additionally, more intense CN molecular bands and weak nitrogen atomic lines in the C 6 H 6 spectrum compared to CS 2 have been observed. Furthermore, molecular emissions of C 2 have not been observed in the CS 2 spectrum. The electron temperature and vibrational temperature have been calculated from the atomic lines and molecular band intensity, respectively. Finally, the validity of the local thermodynamic equilibrium (LTE) assumption in this experiment has been shown.

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