High pressure mass-spectrometric investigations of ion–molecule reactions in propane and argon mixtures

Markowski, Artur; Szot, E.; Wójcik, Leszek

doi:10.1016/j.vacuum.2012.07.015

Vacuum

2013

DOI: 10.1016/j.vacuum.2012.07.015

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High pressure mass-spectrometric investigations of ion–molecule reactions in propane and argon mixtures

Artur Markowski

E. Szot

Leszek Wójcik

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2018

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“…In the mass range of m/z 10−800, no ions were detected with pure argon; however, the use of a dopant led to the generation of the appropriate ions. Markowski et al 23 used argon−propane with a high-pressure ion source and a quadrupole mass spectrometer to study ion− molecule reactions.…”

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Soft Argon–Propane Dielectric Barrier Discharge Ionization

et al. 2018

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Dielectric barrier discharges (DBDs) have been used as soft ionization sources (DBDI) for organic mass spectrometry (DBDI-MS) for approximately ten years. Helium-based DBDI is often used because of its good ionization efficiency, low ignition voltage, and homogeneous plasma conditions. Argon needs much higher ignition voltages than helium when the same discharge geometry is used. A filamentary plasma, which is not suitable for soft ionization, may be produced instead of a homogeneous plasma. This difference results in N, present in helium and argon as an impurity, being Penning-ionized by helium but not by metastable argon atoms. In this study, a mixture of argon and propane (CH) was used as an ignition aid to decrease the ignition and working voltages, because propane can be Penning-ionized by argon metastables. This approach leads to homogeneous argon-based DBDI. Furthermore, operating DBDI in an open environment assumes that many uncharged analyte molecules do not interact with the reactant ions. To overcome this disadvantage, we present a novel approach, where the analyte is introduced in an enclosed system through the discharge capillary itself. This nonambient DBDI-MS arrangement is presented and characterized and could advance the novel connection of DBDI with analytical separation techniques such as gas chromatography (GC) and high-pressure liquid chromatography (HPLC) in the near future.

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Soft Argon–Propane Dielectric Barrier Discharge Ionization

et al. 2018

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High pressure mass-spectrometric investigations of ion–molecule reactions in propane and argon mixtures

Cited by 1 publication

References 41 publications

Soft Argon–Propane Dielectric Barrier Discharge Ionization

Soft Argon–Propane Dielectric Barrier Discharge Ionization

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