Abstract
We have compared time-of-flight mass spectra for an inorganic and a biological macromolecular sample applied on a silicon substrate obtained by laser ablation with femtosecond and nanosecond lasers. Many fragment peaks appeared in the mass spectra for nanosecond laser ablation. In contrast, the samples were effectively atomized to monoatomic ions by femtosecond laser ablation. We find that femtosecond laser ablation has a great advantage in an elemental analysis of solution samples on a substrate. Silicon clusters Sin (up to n = 6) from the substrate were also observed.
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