Gas-phase ion mobility studies of constitutional isomeric hydrocarbons using different ionization techniques

Borsdorf, Helko; Rudolph, Mathias

doi:10.1016/s1387-3806(01)00384-0

Cited by 43 publications

(30 citation statements)

References 29 publications

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“…Their studies then concentrated on showing how well the source performed when recording spectra of ambient air with a subsequent mass-spectrometric analysis of the RIP. The result was that at least in the positive mode the obtained ions are the same as those obtained with a 63 Ni source [although Borsdorf and Rudolph came to a different conclusion 2 years earlier (Borsdorf and Rudolph 2001 )], while in the negative mode enough O 2 -ions are obtained to produce analyte ions in sufficient quantities (so leading to a sufficiently strong analyte signal), but the reactant ion chemistry is more complicated with this source than when using 63 Ni because of the presence of NO 3 -in particular. Hill and Thomas subsequently investigated the influence of delaying the extraction of the ions from the reaction region (Hill and Thomas 2005 ).…”

Section: Application Of the Pulsed Corona Dischargementioning

confidence: 85%

“…Although it was initially intended only to be a non-radioactive alternative, the corona discharge source showed greatly improved ionization efficiency and thus signal intensity as well as signal-to-noise-ratio. Also, additional peaks appeared in the ion mobility spectrum obtained (Borsdorf and Rudolph 2001 ). These peaks are the result of a different ion chemistry when using high-energy discharges, which is a drawback because the ideal replacement source should lead to the same, well-understood chemical reactions as those obtained with radioactive sources.…”

Section: Pulsed Corona Dischargementioning

confidence: 99%

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Pulsed electron beams in ion mobility spectrometry

Baether¹,

Zimmermann²,

Gunzer³

2012

Reviews in Analytical Chemistry

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Abstract:Ion mobility spectrometry is a well-known technique used to analyze trace gases in ambient air. Typically, it works by employing a radioactive source to provide electrons with high energy to ionize the analytes in a series of chemical reactions. During the past ten years non-radioactive sources have been one of the subjects of interest in ion mobility spectrometry, initially in order to replace radioactive sources as a result of general security and regulatory concerns. Among these non-radioactive sources especially pulsed sources have recently been shown to additionally improve the analytic information provided by ion mobility spectrometers. In this review we will describe the progress regarding the application of pulsed non-radioactive electron sources in ion mobility spectrometry and show the recent analytical advances that have been achieved by using pulsed electron beams.

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Section: Application Of the Pulsed Corona Dischargementioning

confidence: 85%

Section: Pulsed Corona Dischargementioning

confidence: 99%

Pulsed electron beams in ion mobility spectrometry

Baether¹,

Zimmermann²,

Gunzer³

2012

Reviews in Analytical Chemistry

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“…For both compound classes, the correlation between inverse ion mobilities and molecular weight is also very good (not shown). The fluoranthenes are flat and rigid molecules, whereas some structural flexibility can be expected for the [4]phenylenes. Most of these compounds are not investigated with IM spectrometry up to now, therefore the ion mobilities were measured here for the first time.…”

Section: Correlations Of Experimental and Calculated Diffusion Cross mentioning

confidence: 99%

“…[1][2][3] Analytical applications range from the detection of BTEX aromatic compounds over drug screening to the detection of explosives and chemical warfare agents. 2,4 Commercially available IM spectrometers, offering high sensitivity and fast response times, use β-rays from 63 Ni-foils or UV radiation from UV lamps as ionisation sources. Because of the limited selectivity of such IM spectrometers, more specific ionisation methods are highly desirable.…”

Section: Introductionmentioning

confidence: 99%

Laser-based ion mobility spectrometry for sensing of aromatic compounds

et al. 2004

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Laser-based ion mobility spectrometry for sensing of aromatic compounds U n i v e r s i t ä t P o t s d a mPostprints der Universität Potsdam Mathematisch-Naturwissenschaftliche Reihe ; 3 fi rst published in: Remote Sensing in Atmosperic Pollution Monitoring and Control / Allen Chu, James Szykman (eds. ABSTRACTThe drift time spectra of polycyclic aromatic hydrocarbons (PAH), alkylbenzenes and alkylphenylethers were recorded with a laser-based ion mobility (IM) spectrometer. The ion mobilities of all compounds were determined in helium as drift gas. This allows the calculation of the diffusion cross sections (Ωcalc) on the basis of the exact hard sphere scattering model (EHSSM) and their comparison with the experimentally determined diffusion cross sections (Ωexp). These Ω exp/Ωcalc-correlations are presented for molecules with a rigid structure like PAH and prove the reliability of the theoretical model and experimental method. The increase of the selectivity of IM spectrometry is demonstrated using resonance enhanced multiphoton ionisation (REMPI) at atmospheric pressure, realized by tuneable lasers. The REMPI spectra of nine alkylbenzenes and alkylphenylethers are investigated. On the basis of these spectra, the complete qualitative distinction of eight compounds in a mixture is shown. These experiments are extended to alkylbenzene isomer mixtures.

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“…Recent studies of constitutional isomeric hydrocarbons (alkylated benzenes: C 9 H 12 and C 10 H 14 ) have revealed that methods of atmospheric pressure chemical ionization ( 63 Ni and corona discharge ionization) produce differences in ion mobility spectra and in the detectable concentration ranges of isomeric compounds depending on the number and position of aliphatic side chains [23]. These differences were attributed to different ionization pathways.…”

mentioning

confidence: 99%

Atmospheric pressure chemical ionization studies of non-polar isomeric hydrocarbons using ion mobility spectrometry and mass spectrometry with different ionization techniques

Borsdorf

Nazarov

Eiceman

2002

J. Am. Soc. Mass Spectrom.

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The ionization pathways were determined for sets of isomeric non-polar hydrocarbons (structural isomers, cis/trans isomers) using ion mobility spectrometry and mass spectrometry with different techniques of atmospheric pressure chemical ionization to assess the influence of structural features on ion formation. Depending on the structural features, different ions were observed using mass spectrometry. Unsaturated hydrocarbons formed mostlywere found for saturated cis/trans isomers using photoionization and 63 Ni ionization. These ionization methods and corona discharge ionization were used for ion mobility measurements of these compounds. Different ions were detected for compounds with different structural features. 63 Ni ionization and photoionization provide comparable ions for every set of isomers. The product ions formed can be clearly attributed to the structures identified. However, differences in relative abundance of product ions were found. Although corona discharge ionization permits the most sensitive detection of non-polar hydrocarbons, the spectra detected are complex and differ from those obtained with 63 Ni ionization and photoionization. (J Am Soc

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Gas-phase ion mobility studies of constitutional isomeric hydrocarbons using different ionization techniques

Cited by 43 publications

References 29 publications

Pulsed electron beams in ion mobility spectrometry

Pulsed electron beams in ion mobility spectrometry

Laser-based ion mobility spectrometry for sensing of aromatic compounds

Atmospheric pressure chemical ionization studies of non-polar isomeric hydrocarbons using ion mobility spectrometry and mass spectrometry with different ionization techniques

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