Why is absorbed laser radiation at 247.85 nm in Fe micro-plasma but not in C micro-plasma?

Hi everyone.  I am doing absorption spectroscopy of micro-plasmas (Fe/C targets) using laser ablation (355 nm). I observe absorption of 247.85 nm Nd:YAG+OPO pulse in Fe micro-plasma (Fe II 247.85...

20 March 2015 817 2 View