Results 171 to 180 of about 2,139 (219)
New LC-MS assays for drugs and endogenous compounds in small-volume biological samples [PDF]
Keski-Rahkonen, Pekka
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Talanta, 2021
The interchange between electrospray ionization (ESI) and corona discharge ionization (CDI) with respect to applied bias on the needle is customarily placed at the point where light production begins at the tip of the needle. If a liquid sample is flowing through a needle that is observed to produce light, the ionization process is assumed to be ...
Eric Davis +2 more
exaly +3 more sources
The interchange between electrospray ionization (ESI) and corona discharge ionization (CDI) with respect to applied bias on the needle is customarily placed at the point where light production begins at the tip of the needle. If a liquid sample is flowing through a needle that is observed to produce light, the ionization process is assumed to be ...
Eric Davis +2 more
exaly +3 more sources
Management of Ionization Source Based on a Pulsed Corona Discharge
Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, 2016It is developed igniting electrical circuit for pulsed corona discharge ionization to operate a source as part of an ion mobility spectrometer. The simulation circuit for forming a corona discharge allowed optimizing the parameters. The possibility of electronic switching of the primary winding and reverse polarity diodes in the high voltage part of ...
Vladimir Belyakov +11 more
exaly +2 more sources
European Journal of Mass Spectrometry, 2004
A corona discharge ion source operating at atmospheric pressure in the point-to-plane configuration was constructed by reconfiguring the ion source of a commercial electrospray ionization (ESI) quadrupole mass spectrometer. This new source allows direct air analysis without modification to the mass spectrometer.
Leah Riter +2 more
exaly +3 more sources
A corona discharge ion source operating at atmospheric pressure in the point-to-plane configuration was constructed by reconfiguring the ion source of a commercial electrospray ionization (ESI) quadrupole mass spectrometer. This new source allows direct air analysis without modification to the mass spectrometer.
Leah Riter +2 more
exaly +3 more sources
Ionization and charge transport phenomena in liquid helium induced by corona discharge
Journal of Electrostatics, 2008Abstract Corona discharge around a point electrode has been used to study ionization and charge transport phenomena in liquid helium (LHe) in a wide range of hydrostatic pressure (0.1–10 MPa). All experiments have been done by using 0.45 and 2.5 μm point electrode radii for negative and positive polarities of the electrode.
Nelly Bonifaci, A Denat
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Towards metals analysis using corona discharge ionization ion mobility spectrometry
Analytica Chimica Acta, 2016For the first time, the capability of corona discharge ionization ion mobility spectrometry (CD-IMS) in the determination of metal complex was evaluated. The extreme simplicity of dispersive liquid-liquid microextraction (DLLME) coupled to the high sensitivity of CD-IMS measurement could make this combination really useful for simple, rapid, and ...
Mohammad Jafari +2 more
exaly +3 more sources
Development of a short pulsed corona discharge ionization source for ion mobility spectrometry [PDF]
Review of Scientific Instruments, 2005 The development of a pulsed corona discharge ionization source and its use in ion mobility spectrometry (IMS) is presented. In a point-plane electrode geometry, an electrical pulse up to 12 kV, 150 ns rise time and 500 ns pulse width was used to generate a corona discharge in air. A single positive high voltage pulse was able to generate about 1.6×1010
An, YA +3 more
openaire +3 more sources
IEEE Transactions on Plasma Science, 2016
Atmospheric corona discharge plasmas are the most common diversely occurrence in the electric power system. In this paper, four elementary processes occurred in corona discharge are taken into account, including elastic collision, excitation, attachment, and ionization.
Xishan Wen, Lei Lan, Xiaoqing Yuan
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Atmospheric corona discharge plasmas are the most common diversely occurrence in the electric power system. In this paper, four elementary processes occurred in corona discharge are taken into account, including elastic collision, excitation, attachment, and ionization.
Xishan Wen, Lei Lan, Xiaoqing Yuan
exaly +2 more sources
Design and optimization of a corona discharge ionization source for ion mobility spectrometry
Review of Scientific Instruments, 2000In this work the possibility of using corona discharge as an ionization source in ion mobility spectrometry has been investigated. The results for both positive and negative polarity in air are consistent with the Townsend formula which states that I/V is a linear function of V. The distribution profile of the corona ions has also been investigated and
M. Tabrizchi, T. Khayamian, N. Taj
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Corona discharge ionization of paracetamol molecule: Peak assignment
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2015Ionization of paracetamol was investigated using ion mobility spectrometry equipped with a corona discharge ionization source. The measurements were performed in the positive ion mode and three peaks were observed in the ion mobility spectrum. Experimental evidence and theoretical calculations were used to correlate the peaks to related ionic species ...
H, Bahrami, H, Farrokhpour
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