CONCLUSION
Laser ablation sampling was found to be more sensitive and
accurate when using picosecond compared to nanosecond pulses.
In addition, for picosecond laser ablation sampling, the gas
composition in the sample chamber was found to affect ICP-AES
sensitivity, both by influencing the ICP excitation conditions and
by changing the laser ablation process itself. Adding noble gas
to the sample chamber acts to influence the efficiency of laser
sampling, most likely by changing the influence of plasma
shielding. Gas atmosphere effects on laser ablation sampling
efficiency were more important for high ionization potential gases,
especially He. For low ionization potential gases, i.e., Kr and Xe,
the changes in ICP excitation conditions were more significant.
The improvement in sensitivity when using He is beneficial to
chemical analysis, especially for trace analysis that requires high
sensitivity. The gas composition was also found to affect the
stoichiometry of the ablated mass, as was observed when using
He in the sample chamber; additional studies are ongoing to
determine the cause of this stoichiometric change
CONCLUSION
Laser ablation sampling was found to be more sensitive and
accurate when using picosecond compared to nanosecond pulses.
In addition, for picosecond laser ablation sampling, the gas
composition in the sample chamber was found to affect ICP-AES
sensitivity, both by influencing the ICP excitation conditions and
by changing the laser ablation process itself. Adding noble gas
to the sample chamber acts to influence the efficiency of laser
sampling, most likely by changing the influence of plasma
shielding. Gas atmosphere effects on laser ablation sampling
efficiency were more important for high ionization potential gases,
especially He. For low ionization potential gases, i.e., Kr and Xe,
the changes in ICP excitation conditions were more significant.
The improvement in sensitivity when using He is beneficial to
chemical analysis, especially for trace analysis that requires high
sensitivity. The gas composition was also found to affect the
stoichiometry of the ablated mass, as was observed when using
He in the sample chamber; additional studies are ongoing to
determine the cause of this stoichiometric change
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