Detection of positive and negative ions from a flowing atmospheric pressure afterglow using a mattauch-herzog mass spectrograph equipped with a faraday-strip array detector |
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Authors: | Gregory D Schilling Jacob T Shelley James H Barnes Roger P Sperline M Bonner Denton Charles J Barinaga David W Koppenaal Gary M Hieftje |
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Institution: | (1) Department of Chemistry, Indiana University, Bloomington, IN 47405, USA;(2) Department of Chemistry, University of Maryland, Baltimore County, Baltimore, MD 21250, USA;(3) Department of Chemistry, University of Arizona, Tucson, AZ 85721, USA;(4) Steward Observatory, University of Arizona, Tucson, AZ 85721, USA;(5) Pacific Northwest National Laboratory, Richland, WA 99352, USA; |
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Abstract: | An ambient desorption/ionization (ADI) source, known as the flowing atmospheric pressure afterglow (FAPA), has been coupled
to a Mattauch-Herzog mass spectrograph (MHMS) equipped with a focal plane camera (FPC) array detector. The FAPA ionization
source enables direct mass spectral analysis of solids, liquids, and gases through either positive or negative ionization
modes. In either case, spectra are generally simple with dominant peaks being the molecular ions or protonated molecular ions.
Use of the FAPA source with the MHMS allows the FPC detector to be characterized for the determination of molecular species,
whereas previously only atomic mass spectrometry (MS) has been demonstrated. Furthermore, the FPC is shown to be sensitive
to negative ions without the need to change any detector parameters. The analysis of solid, liquid, and gaseous samples through
positive and negative ionization is demonstrated with detection limits (1–25 fmol/s, ∼0. 3–10 pg of analyte per mL of helium)
surpassing those obtained with the FAPA source coupled to a time-of-flight mass analyzer. |
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