Characterization of a capillary dielectric barrier plasma jet for use as a soft ionization source by optical emission and ion mobility spectrometry

Olenici-Craciunescu, S.B.; Michels, A.; Meyer, Cordula; Heming, Richard; Tombrink, Sven; Vautz, Wolfgang; Franzke, Joachim

doi:10.1016/j.sab.2009.10.001

Cited by 81 publications

(77 citation statements)

References 28 publications

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“…Studies have also been conducted on the use of helium-DBDs as ionization sources in ion mobility spectrometry (IMS) and for liquid chromatography/mass spectrometry [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Operation modes of the helium dielectric barrier discharge for soft ionization

Müller

Krähling

Veža

et al. 2013

Spectrochimica Acta Part B: Atomic Spectroscopy

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“…Studies have also been conducted on the use of helium-DBDs as ionization sources in ion mobility spectrometry (IMS) and for liquid chromatography/mass spectrometry [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Operation modes of the helium dielectric barrier discharge for soft ionization

Müller

Krähling

Veža

et al. 2013

Spectrochimica Acta Part B: Atomic Spectroscopy

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“…Ionization mechanisms for DART in the negativeionization mode were compared with those for APCI and atmospheric-pressure photoionization (APPI) by analyzing a large suite of molecules [14,15]. Franzke et al [16] compared emission spectra from a DBD, using different discharge gases, with protonated analyte signals from an ion-mobility spectrometer.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Flowing Atmospheric-Pressure Afterglow (FAPA) Ambient Ionization Source through Optical Means

Shelley

Chan

Hieftje

2011

J. Am. Soc. Mass Spectrom.

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The advent of ambient desorption/ionization mass spectrometry (ADI-MS) has led to the development of a large number of atmospheric-pressure ionization sources. The largest group of such sources is based on electrical discharges; yet, the desorption and ionization processes that they employ remain largely uncharacterized. Here, the atmospheric-pressure glow discharge (APGD) and afterglow of a helium flowing atmospheric-pressure afterglow (FAPA) ionization source were examined by optical emission spectroscopy. Spatial emission profiles of species created in the APGD and afterglow were recorded under a variety of operating conditions, including discharge current, electrode polarity, and plasma-gas flow rate. From these studies, it was found that an appreciable amount of atmospheric H(2)O vapor, N(2), and O(2) diffuses through the hole in the plate electrode into the discharge to become a major source of reagent ions in ADI-MS analyses. Spatially resolved plasma parameters, such as OH rotational temperature (T(rot)) and electron number density (n(e)), were also measured in the APGD. Maximum values for T(rot) and n(e) were found to be ~1100 K and ~4×10(19) m(-3), respectively, and were both located at the pin cathode. In the afterglow, rotational temperatures from OH and N(2)(+) yielded drastically different values, with OH temperatures matching those obtained from infrared thermography measurements. The higher N(2)(+) temperature is believed to be caused by charge-transfer ionization of N(2) by He(2)(+). These findings are discussed in the context of previously reported ADI-MS analyses with the FAPA source.

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“…This active species cannot be initiated by APPJ with pure nitrogen. [19] Ambient species, such as N 2 , OH radical were also observed. Weak emission of both atomic O (777 nm) and H (656 nm) were observed in mixed Ar/N 2 gas plasma jets.…”

Section: Resultsmentioning

confidence: 98%

Adhesion Improvement via Surface Functionalization of Epoxy‐Resin Base Post by Low Temperature Plasma

Rakitikul

Lee

Yavirach

et al. 2015

Macromolecular Symposia

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Summary:The adhesion between dental materials could be improved by an increase of interfacial polarity. In this study, low temperature plasma was used to treat an epoxy-based post. The surface modifications after treatment were characterized by X-ray photoelectron spectroscopy (XPS) which showed the existence of N, O-containing groups in the epoxy-based post. Furthermore, functionalization positions were proposed by Quantum Mechanic (QM) calculation. It could confirm the position that such a functional group was formed at hydroxyl group and alpha-carbon with an energy level around 93-97 kcal/mol through hydrogen abstraction reaction. Both experiments and calculations show consistent results indicating polar group formation on the surface after plasma treatments.

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Characterization of a capillary dielectric barrier plasma jet for use as a soft ionization source by optical emission and ion mobility spectrometry

Cited by 81 publications

References 28 publications

Operation modes of the helium dielectric barrier discharge for soft ionization

Operation modes of the helium dielectric barrier discharge for soft ionization

Understanding the Flowing Atmospheric-Pressure Afterglow (FAPA) Ambient Ionization Source through Optical Means

Adhesion Improvement via Surface Functionalization of Epoxy‐Resin Base Post by Low Temperature Plasma

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