Reactant ions in negative ion plasma chromatography

Spangler, Glenn E.; Collins, Charles I.

doi:10.1021/ac60353a019

Cited by 79 publications

(46 citation statements)

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“…Normally the negative ionization chemistry associated with ionospheric research is used to interpret IMS data [6,39,[49][50][51][52][53][54]. However because of the difficulties encountered in interpreting the present data, it was necessary to carefully molecular model the reaction sequences.…”

Section: Discussionmentioning

confidence: 99%

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Molecular modeling interpretation of IMMS data collected on negative ionization of methyl salicylate using radioactive, corona discharge and photo-ionization

Spangler¹

2015

Int. J. Ion Mobil. Spec.

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Except for electrospray ionization that was introduced later to handle biochemical analyses, the radioactive source has been the benchmark ionization source for ion mobility spectrometry. On the other hand, the licensing requirements accompanying the use of the source has created a desire to replace it with a nonradioactive source with an equivalent ionization capability. Two such sources are the discharge and photoionization sources that are capable of negatively ionizing the internally hydrogen bonded ketoB isomer of methyl salicylate. IMMS data show that if the negative reactant ions are NO 3 − ·HNO 3 (discharge source) or CO 3 − (doped photoionization source), methyl salicylate cannot be ionized. However when the sources are synchronously pulsed with a shutter grid, methyl salicylate can be ionized by the formation of the oxygen anion adduct, O 2 − ·M, similar to radioactive ionization. The ionization capability depends not only upon the partial concentration of oxygen in the immediate ionization region but also on the geometry used to construct the source. Molecular modeling shows that the UV radiation emitted by the sources will photodissociate the reactant ions that reconstitute as the energy of the UV radiation decreases during the pulsing cycle. The reconstitution of CO 3 − is delayed due to a change in geometric symmetry and is the first to leave the ionization region because of its high mobility. This allows methyl salicylate to be ionized by oxygen anions.

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Section: Discussionmentioning

confidence: 99%

“…31-5.53 Mev α + emitter) can also be used. Submitted for publication in special issue on IMS modeling and simulation and in the negative ion mode, the ionization sequence is [6,7] …”

Section: Introductionmentioning

confidence: 99%

Molecular modeling interpretation of IMMS data collected on negative ionization of methyl salicylate using radioactive, corona discharge and photo-ionization

Spangler¹

2015

Int. J. Ion Mobil. Spec.

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“…When chlorine or chlorine derivatives are present in the drift-time spectra, Cl 2 -or Clions appear, while in the presence of nitric oxide and ammonia, NO 2 -ions are created [24]. In the presence of nitrogen oxides produced in the corona discharge (CD) area, other peaks of ions with a more complex structure are also observed [25].…”

Section: Ionization In the Positive Mode Of Detectionmentioning

confidence: 99%

“…the analyte by ions generated in reactions(22)(23)(24)(25) occurs through adduct formation, charge transfer, or proton abstraction. In studies carried out with a DMS detector with a photoionization source, it was possible to detect sulfur hexafluoride and nitrogen oxides in the negative mode using acetone as a dopant[80].…”

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confidence: 99%

Dopants and gas modifiers in ion mobility spectrometry

Waraksa

Perycz

Namieśnik

et al. 2016

TrAC Trends in Analytical Chemistry

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“…1. The peak at 5 ms present in four of the five spectra was identified as the Cl − ion based on the K o reference value of 2.94 cm 2 V − 1 s − 1 (our experimental value was 2.91 cm 2 V − 1 s − 1) [29]. Each standard was injected three times for verification that the observed response was not due to carryover from previous samples and was reproducible within 2%.…”

Section: Ims Response For 17 Suspected Contaminantsmentioning

confidence: 99%