Mobility behavior and composition of hydrated positive reactant ions in plasma chromatography with nitrogen carrier gas

Kim, S. H.; Betty, K. R.; Karasek, F.W.

doi:10.1021/ac50036a018

Cited by 86 publications

(20 citation statements)

References 38 publications

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“…Ion mobility spectrometers that operate with low electrostatic fields at atmospheric pressure have been in use as analytical instruments for many years [1][2][3][4]. Ions are formed in an ionization region, usually for convenience with a 63 Ni source providing electrons of maximum energy 67 keV, although photoionization and corona discharge sources are sometimes used.…”

Section: Introductionmentioning

confidence: 99%

A determination of the effective temperatures for the dissociation of the proton bound dimer of dimethyl methylphosphonate in a planar differential mobility spectrometer

Eiceman

Stone

2010

Int. J. Ion Mobil. Spec.

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The dissociation of the proton bound dimer of dimethyl methylphosphonate to the protonated and neutral molecule has been studied in a planar differential mobility spectrometer. The internal energy of the ions is the sum of the thermal component and the electric field component and results in an effective temperature, T eff , that is significantly greater than that of the ambient atmosphere temperature, T. The measured rate constant for dissociation, which rises exponentially with field strength, together with activation energy and pre-exponential factor previously determined under thermal conditions, allow the calculation of T eff as a function of electric field strength. T eff is a linear function of electric field intensity at constant T over the range of T from 60°C to 140°C. The efficiency of the available collision energy in causing dissociation decreases with increasing T, from 52% at 60°C to 40% at 140°C.

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Section: Introductionmentioning

confidence: 99%

A determination of the effective temperatures for the dissociation of the proton bound dimer of dimethyl methylphosphonate in a planar differential mobility spectrometer

Eiceman

Stone

2010

Int. J. Ion Mobil. Spec.

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“…Mobility spectra obtained in the absence of analyte were repeatable showing a single peak, due to the reactant ion, the hydrated proton, H + (H 2 O) n 29,30 . The field dependence of this peak is seen in the characteristic DMS dispersion plot in Fig.…”

Section: Resultsmentioning

confidence: 99%

Differential Mobility Spectrometry of Ketones in Air at Extreme Levels of Moisture

Safaei

Eiceman

Puton

et al. 2019

Sci Rep

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The performance of a differential mobility spectrometer was characterized at ambient pressure and ten values of water vapor concentration, from 1.0 × 10 2 to 1.7 × 10 4 ppm using a homologous series of seven ketones from acetone to 2-dodecanone. Dispersion plots at 30 °C with separation fields from 35 to 123 Td exhibited increased alpha functions for the hydrated proton, protonated monomers, and proton bound dimers with increased moisture levels. Increases in the level of moisture were accompanied by decreased quantitative response with progressive suppression in the formation of the proton bound dimer first and then protonated monomer. Product ions for 2-octanone at 7 ppb were not observed above a moisture level of 4.0 × 10 3 ppm, establishing a limit for observation of analyte ion formation. The observation limit increased from 1.1 × 10 3 ppm for acetone to 5.7 × 10 3 ppm for 2-dodecanone. These findings demonstrate that ketones can be determined with a differential mobility spectrometry (DMS) analyzer near room temperature in the presence of elevated levels of moisture expected with the use of membrane inlets or headspace sampling of surface or ground waters. Moisture levels entering this DMS analyzer employed as an environmental monitor should be kept at 1.0 × 10 3 ppm or below and quantitative studies for individual ketones should be made at a fixed moisture level.

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“…The four main ion peaks appeared in this figure provide specific details about this sample. The peaks can be assigned as (i) hydronium ion [(H 2 O) n H + ] or the reactant ion peak (RIP) in positive polarity of ion mobility measurement, (ii) proton bound monomer of ethyl acetate [MH + ], and (iii) proton bound dimer of ethyl acetate [M 2 H + ] (M is ethyl acetate molecule and n is an integer)(16, 17).…”

Section: Resultsmentioning

confidence: 99%

Automated chemical identification and library building using dispersion plots for differential mobility spectrometry

et al. 2018

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Differential mobility spectrometry (DMS) based detectors require rapid data analysis capabilities, embedded into the devices to achieve the optimum detection capabiites as portable trace chemical detectors. Automated algorithm-based DMS dispersion plot data analysis method was applied for the first time to pre-process and separate 3-dimentional (3-D) DMS dispersion data. We previously demonstrated our AnalyzeIMS (AIMS) software was capable of analyzing complex gas chromatography differential mobility spectrometry (GC-DMS) data sets. In our present work, the AIMS software was able to easliy separate DMS dispersion data sets of five chemicals that are important in detection of volatile organic compounds (VOCs): 2-butanone, 2-propanone, ethyl acetate, methanol and ethanol. Identification of chemicals from mixtures, separation of chemicals from a mixture and prediction capability of the software were all tested. These automated algorithms may have potential applications in separation of chemicals (or ion peaks) from other 3-D data obtained by hybrid analytical devices such as mass spectrometry (MS). New algorithm developments are included as future considerations to improve the current numerical approaches to fingerprint chemicals (ions) from a significantly complicated dispersion plot. Comprehensive peak identifcation by DMS-MS, variations of the DMS data due to chemical concentration, gas phase ion chemistry, temperature and pressure of the drift gas are considered in future algorithm improvements.

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Mobility behavior and composition of hydrated positive reactant ions in plasma chromatography with nitrogen carrier gas

Cited by 86 publications

References 38 publications

A determination of the effective temperatures for the dissociation of the proton bound dimer of dimethyl methylphosphonate in a planar differential mobility spectrometer

A determination of the effective temperatures for the dissociation of the proton bound dimer of dimethyl methylphosphonate in a planar differential mobility spectrometer

Differential Mobility Spectrometry of Ketones in Air at Extreme Levels of Moisture

Automated chemical identification and library building using dispersion plots for differential mobility spectrometry

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