http://dx.doi.org/10.1016/j.sab.2015.05.010">
 

Document Type

Journal Article

Department/Unit

Department of Physics

Title

Double-pulse laser ablation sampling: Enhancement of analyte emission by a second laser pulse at 213 nm

Language

English

Abstract

© 2015 Elsevier B.V. All rights reserved.For the purpose of devising methods for minimally destructive multi-element analysis, we compare the performance of a 266 nm-213 nm double-pulse scheme against that of the single 266 nm pulse scheme. The first laser pulse at 266 nm ablates a mica sample. Ten ns later, the second pulse at 213 nm and 64 mJ cm- 2 orthogonally intercepts the gas plume to enhance the analyte signal. Emissions from aluminum, silicon, magnesium and sodium are simultaneously observed. At low 266 nm laser fluence when only sub-ng of sample mass is removed, the signal enhancement by the 213 nm pulse is especially apparent. The minimum detectable amount of aluminum is about 24 fmol; it will be a hundred times higher if the sample is analyzed by the 266 nm pulse alone. The minimum detectable mass for the other analytes is also reduced by about two orders of magnitude when the second pulse at 213 nm is introduced. The spectral and temporal properties of the enhanced signal are consistent with the mechanism of ultra-violet laser excited atomic fluorescence of dense plumes.

Keywords

213 nm, Double laser pulse scheme, Minimally destructive multi element analysis, Plume-LEAF, Pulsed laser ablation sampling

Publication Date

2015

Source Publication Title

Spectrochimica Acta Part B: Atomic Spectroscopy

Volume

110

Start Page

51

End Page

55

Publisher

Elsevier

ISSN (print)

05848547

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