OPTICAL EMISSION STUDIES OF C-2 SPECIES IN LASER-PRODUCED PLASMA FROM CARBON

摘要

Optical emission studies of C-2 molecules in plasma obtained by Nd:YAG laser ablation of graphite in a helium atmosphere are reported for irradiances in the range (1-9.2) x 10(10) W cm(-2). The characteristics of the spectral emission intensity from the C-2 (Swan band) species have been investigated as functions of the distance from the target, ambient pressure and laser irradiance. Estimates of vibrational temperatures of C-2 species under various irradiance conditions are made. Results of measurements performed under different ambient helium gas pressures are also discussed. [References: 29]