Radially Resolved Optical Emission Spectral Imaging Diagnostics of Atmospheric Pressure µDBD Jet for Direct Surface Solid Sampling Analysis

Songyue Shi, Kevin Finch, Gerardo Gamez Goytia

Research output: Contribution to journalArticlepeer-review

Abstract

Dielectric barrier discharges are receiving increasing attention as sampling/ionization sources for ambient mass spectrometry. Nevertheless, the underlying mechanisms are not completely understood, particularly when the plasma plume is exposed to a sample surface. Herein, an atmospheric pressure helium micro-dielectric barrier discharge (μDBD), flowing into open-air and onto a sample surface (floating Cu or LDPE), is studied <i>via</i> optical emission spectroscopy (OES) with radial information extracted through Abel's inversion. Radially resolved optical emission profiles along the axis are shown to shift with respect to the line-of-sight counterparts, for some species. The OES images, as well as vibrational and rotational temperature maps, indicate the energy transfers mainly <i>via</i> Penning ionization of N<sub>2</sub> with He metastables to produce N<sub>2</sub><sup>+</sup>, as the plasma plume exits the capillary into open air, while charge transfer with He<sub>2</sub><sup>+</s
Original languageEnglish
JournalJournal of Analytical Atomic Spectrometry
StatePublished - Apr 2021

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