Laser Ablation Molecular Isotopic Spectrometry |
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Authors: | Richard E Russo Alexander A Bol'shakov Xianglei Mao Christopher P McKay Dale L Perry Osman Sorkhabi |
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Institution: | a Lawrence Berkeley National Laboratory, University of California, Berkeley, CA 94720, USA;b Applied Spectra, Inc., 46661 Fremont Boulevard, Fremont, CA 94538, USA;c NASA-Ames Research Center, Moffett Field, CA 94035, USA |
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Abstract: | A new method of performing optical isotopic analysis of condensed samples in ambient air and at ambient pressure has been developed: Laser Ablation Molecular Isotopic Spectrometry (LAMIS). The technique uses radiative transitions from molecular species either directly vaporized from a sample or formed by associative mechanisms of atoms or ions in a laser ablation plume. This method is an advanced modification of a known atomic emission technique called laser-induced breakdown spectroscopy (LIBS). The new method — LAMIS — can determine not only chemical composition but also isotopic ratios of elements in the sample. Isotopic measurements are enabled by significantly larger isotopic shifts found in molecular spectra relative to atomic spectra. Analysis can be performed from a distance and in real time. No sample preparation or pre-treatment is required. Detection of the isotopes of hydrogen, boron, carbon, and oxygen are discussed to illustrate the technique. |
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Keywords: | Optical isotopic measurements Laser ablation plasma Molecular emission spectra Real-time chemical analysis Chemical analysis LAMIS |
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