Abstract:
The objective of this research was the utilization of laser induced breakdown
spectroscopy (LIBS) technique in investigation of elements in three different
kinds of gasoline. Q-switched-Nd: YAG Laser with 10 (ns) pulse duration, 23.4
(mJ) energy per pulse, 0.5 Hz repetition rate was used and focused on the sample
to achieve high power density leads to very high temperature in the focal volume
and then undergo a number of reactions resulting in formation of a plasma for
the sample with discrete emission lines which represent fingerprints of the atoms
and ions constitute the sample. A spectrometer connected to PC was used to
collect and record the emission spectra of the samples plasma. The recorded
spectra were processed by subtracting the dark current, pumping flashlamp
spectra and background radiation. The elements were identified from the emitted
lines after referring to the atomic spectra database. A comparison was done
between the sample contents. The results showed that there are elements found
in all the three samples with different amounts while there are some elements
that not found in all the three kinds of gasoline.
