Mass-selective laser photoionization
نویسندگان
چکیده
منابع مشابه
Infrared laser ablation atmospheric pressure photoionization mass spectrometry.
In this paper we introduce laser ablation atmospheric pressure photoionization (LAAPPI), a novel atmospheric pressure ion source for mass spectrometry. In LAAPPI the analytes are ablated from water-rich solid samples or from aqueous solutions with an infrared (IR) laser running at 2.94 μm wavelength. Approximately 12 mm above the sample surface, the ablation plume is intercepted with an orthogo...
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Atmospheric pressure photoionization (APPI) is the last arrival in the family of atmospheric pressure ionization (API) methods to couple mass spectrometry (MS) to liquid-phase separation techniques. The basic idea was to further extend the fields of application of liquid chromatography (LC)-MS to those molecules that are not, or are poorly amenable, to electrospray (ESI) or APCI. The present re...
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RATIONALE Despite fast advances in ambient mass spectrometry imaging (MSI), the study of neutral and nonpolar compounds directly from biological matrices remains challenging. In this contribution, we explore the feasibility of laser ablation atmospheric pressure photoionization (LAAPPI) for MSI of phytochemicals in sage (Salvia officinalis) leaves. METHODS Sage leaves were studied by LAAPPI-t...
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The selective desorption/ionization of analytes using nanomaterials is investigated using metallic nanoparticles. By replacing the sodium citrate capping of gold nanoparticles with self-assembled monolayers, we are able to both enhance analyte ionization and selectively capture analytes. Capping gold nanoparticles with a monolayer of 4-mercaptobenzoic acid enhances analyte ionization while grea...
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REMPI (Resonantly Enhanced Multi Photon Ionization) is an ultra-sensitive analytical technique based on the unique combination of laser spectroscopy and mass spectrometry that can rapidly identify and quantify vapor-phase constituents present at part per trillion levels. We have used this method to examine human breath samples for biomarkers of infection. Based on the observed results, we estim...
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ژورنال
عنوان ژورنال: Journal of Chemical Education
سال: 1982
ISSN: 0021-9584,1938-1328
DOI: 10.1021/ed059p934