Detection of explosives using a hollow cathode discharge ion source

Habib, Ahsan; Chen, Lee Chuin; Usmanov, Dilshadbek T.; Yu, Zhan

doi:10.1002/rcm.7142

Cited by 23 publications

(59 citation statements)

References 44 publications

(101 reference statements)

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“…Elimination of H 2 O from CH 3 C(OH) 2 + (protonated acetic acid) generated from ethanol is also exothermic; PA (CH 2 C = O) is 198.0 kcal/mol. [8] Figure S2 Thus, O +• will be quickly converted to O 2 +• by the charge transfer reaction (11).…”

Section: Resultsmentioning

confidence: 99%

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Mass spectrometric monitoring of oxidation of aliphatic C6–C8 hydrocarbons and ethanol in low pressure oxygen and air plasmas

et al. 2016

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Experimental and theoretical studies on the oxidation of saturated hydrocarbons (n-hexane, cyclohexane, n-heptane, n-octane and isooctane) and ethanol in 28 Torr O or air plasma generated by a hollow cathode discharge ion source were made. Ions corresponding to [M + 15] and [M + 13] in addition to [M - H] and [M - 3H] were detected as major ions where M is the sample molecule. The ions [M + 15] and [M + 13] were assigned as oxidation products, [M - H + O] and [M - 3H + O] , respectively. By the tandem mass spectrometry analysis of [M - H + O] and [M - 3H + O] , H O, olefins (and/or cycloalkanes) and oxygen-containing compounds were eliminated from these ions. Ozone as one of the terminal products in the O plasma was postulated as the oxidizing reagent. As an example, the reactions of C H with O and of C H (CH CH CH CH CH CH ) with ozone were examined by density functional theory calculations. Nucleophilic interaction of ozone with C H leads to the formation of protonated ketone, CH CH C(=OH )CH CH CH . In air plasma, [M - H + O] became predominant over carbocations, [M - H] and [M - 3H] . For ethanol, the protonated acetic acid CH C(OH) (m/z 61.03) was formed as the oxidation product. The peaks at m/z 75.04 and 75.08 are assigned as protonated ethyl formate and protonated diethyl ether, respectively, and that at m/z 89.06 as protonated ethyl acetate. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Resultsmentioning

confidence: 99%

“…The geometry of the hollow cathode discharge (HCD) ion source used in this work was described in detail in our previous work. [11] In brief, Fig. S1 shows the schematic diagram of the HCD ion source.…”

Section: Experimental Methodsmentioning

confidence: 99%

Mass spectrometric monitoring of oxidation of aliphatic C6–C8 hydrocarbons and ethanol in low pressure oxygen and air plasmas

et al. 2016

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“…In this work, mass spectrometric study on the ion/molecule reactions of hydrocarbons ( n ‐hexane, cyclohexane, n ‐heptane, n ‐octane, isooctane, benzene and acetone) and ethanol in the low‐pressure nitrogen plasma was made using a hollow cathode discharge (HCD) ion source. The direct incorporation of N in the sample compounds to form [M+N] + was observed as the major ions for C6–C8 saturated hydrocarbons and ethanol.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen incorporation in saturated aliphatic C6–C8 hydrocarbons and ethanol in low‐pressure nitrogen plasma generated by a hollow cathode discharge ion source

et al. 2016

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Ion/molecule reactions of saturated hydrocarbons (n-hexane, cyclohexane, n-heptane, n-octane and isooctane) in 28-Torr N2 plasma generated by a hollow cathode discharge ion source were investigated using an Orbitrap mass spectrometer. It was found that the ions with [M+14](+) were observed as the major ions (M: sample molecule). The exact mass analysis revealed that the ions are nitrogenated molecules, [M+N](+) formed by the reactions of N3 (+) with M. The reaction, N3 (+) + M → [M+N](+) + N2 , were examined by the density functional theory calculations. It was found that N3 (+) abstracts the H atom from hydrocarbon molecules leading to the formation of protonated imines in the forms of R'R″CNH2 (+) (i.e. C-H bond nitrogenation). This result is in accord with the fact that elimination of NH3 is the major channel for MS/MS of [M+N](+) . That is, nitrogen is incorporated in the C-H bonds of saturated hydrocarbons. No nitrogenation was observed for benzene and acetone, which was ascribed to the formation of stable charge-transfer complexes benzene⋅⋅⋅⋅N3 (+) and acetone⋅⋅⋅⋅N3 (+) revealed by density functional theory calculations. Copyright © 2016 John Wiley & Sons, Ltd.

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“…4(d)), [M-H] À (m/z 226), [M-NO+HNO 3 ] À (m/z 260) and [M-NO] À (m/z 197) are observed as major ions. In our previous work, [5,7] ion/molecule reactions in TNT were studied in detail and the following reactions were proposed for the formation of…”

Section: Resultsmentioning

confidence: 99%

Discontinuous atmospheric pressure interface for mass spectrometry using a solenoid pulse valve

Usmanov

Hiraoka

2016

Rapid Commun. Mass Spectrom.

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Detection of explosives using a hollow cathode discharge ion source

Cited by 23 publications

References 44 publications

Mass spectrometric monitoring of oxidation of aliphatic C6–C8 hydrocarbons and ethanol in low pressure oxygen and air plasmas

Mass spectrometric monitoring of oxidation of aliphatic C6–C8 hydrocarbons and ethanol in low pressure oxygen and air plasmas

Nitrogen incorporation in saturated aliphatic C6–C8 hydrocarbons and ethanol in low‐pressure nitrogen plasma generated by a hollow cathode discharge ion source

Discontinuous atmospheric pressure interface for mass spectrometry using a solenoid pulse valve

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