Time-resolved optical emission studies on the laser ablation of a graphite target: The effects of ambient gases

• DOI: 10.1063/1.1925336
• Publication Date: 2005-05-23T22:07:49Z
• Authors: Hye Sun Park; Sang Hwan Nam; Seung Min Park
• Keywords: Laser Ablation

Time-resolved optical emission spectroscopy was employed to examine the temporal properties of a plume formed by laser ablation graphite target in He, N2, and Ar background gases. Time-dependent spectroscopic temperatures electronically excited C2 CN molecules generated at different gases pressures were derived simulation spectra. The rotational temperature significantly higher than vibrational temperature. This indicates that they are gas phase chemical reaction C2+N2→CN. At pressure above 0.5Torr, each apparently order Ar>N2>He while there no such dependence 0.1Torr. expansion dynamics cooling rate turned out be highly dependent on its pressure.