| Nitrogen-treatment of metal surfaces with nitrogen-containing low-temperature plasma formed by glow discharge is a common method of chemical heat treatment. The products dealt with nitrogen treatment have excellent properties such as wear resistance, fatigue resistance, corrosion resistance and high temperature resistance. There are a large number of transient species existing in nitrogen-containing low-temperature plasma, such as molecular ions, radicals, atoms and molecules in excited states. The study of nitrogen-containing plasma by the laser spectroscopy will help us understand the process of nitrogen-treatment and improve or invent new technology of nitrogen-treatment.Using the velocity-modulation and concentration-modulation techniques, we studied the absorption spectrum of the low-temperature plasma which formed in the N2O glow discharge. Many absorption lines of molecular ions and excited neutral molecular were recorded in the range of 1722-1831 cm-1, The absorption lines of molecular ions are most likely to belong to theυ3 vibration band of N2O+, but their carriers and assignments can not be determined yet.In order to identify the excited neutral molecules observed in the N2O glow discharge, we studied the absorption spectrum of the low-temperature plasma which formed in the N2 glow discharge. Two hundred and thirty three absorption lines of neutral molecules were recorded in the range of 1742-1846cm-1. Sixty five lines can be assigned to the B3Πg-W3Δu(1→0) and (2→1)vibrational bands of the N2, but the assignments of other lines are still not sure.
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