Negative ion mass spectrum of the resonance electron capture by molecules of p-benzoquinone

Khvostenko, O. G.; Shchukin, P. V.; Tuimedov, G. M.; Муфтахов, М. В.; Tseplin, E. E.; Tseplina, S. N.; Mazunov, V. A.

doi:10.1016/j.ijms.2008.03.001

Cited by 34 publications

(31 citation statements)

References 10 publications

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“…The scheme of the apparatus is presented in Ref. 12. The fast switch from one mode to another was carried out by changing the polarity of the electrode potentials of the ion optical system and the current polarity of the analyzing electromagnet.…”

Section: Methodsmentioning

confidence: 99%

Resonant dissociative electron capture by the simplest amino acids and dipeptides

Муфтахов

Shchukin

2010

Russ Chem Bull

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The formation of ions from amino acids (glycine and alanine) and dipeptides (glycylglycine, alanylalanine, and glycylalanine) under the resonant electron capture conditions was studied by negative ion resonant electron capture mass spectrometry. The isobaric ions were found, their effective yield curves were experimentally separated, and the elemental composition was determined. The thermochemical aspect of ion formation was considered, and probable disso ciative channels of fragmentation ion formation and their structures were established on the basis of this aspect. Bond cleavage reactions only and H shift processes were revealed. The rearrangements occur presumably through the stage of formation of intramolecular hydrogen bonds. The cross sections of formation of ions [M -Н] -were measured in the energy range 1.1-1.3 eV. The metastable decay channels of ions [M -Н] -and [M -СООН] -were found in the energy range 4.5-7.5 eV for dipeptides, which enabled establishing the genetic relation ship between the parental and daughter ions and revealing hidden fragmentation pathways.

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Section: Methodsmentioning

confidence: 99%

Resonant dissociative electron capture by the simplest amino acids and dipeptides

Муфтахов

Shchukin

2010

Russ Chem Bull

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“…The negative ion mass spectrum of the resonant electron capture by molecules of duroquinone (the sample of ≥97% purity obtained from Aldrich) was recorded with MI‐1201B mass spectrometer, modified for the operation in the resonant electron capture regime by the group of Khvostenko . We note that a more recent description of the instrument is also available . In that report, the ability of such a mass spectrometer to register directly ions with lifetimes longer than 1 µs is also described in detail.…”

Section: Methodsmentioning

confidence: 99%

“…We note that a more recent description of the instrument is also available . In that report, the ability of such a mass spectrometer to register directly ions with lifetimes longer than 1 µs is also described in detail. It is a static magnetic sector mass spectrometer with electron beam ionization, which was initially built by the Sumy JSC “Selmi” for standard studies with positive ions.…”

Section: Methodsmentioning

confidence: 99%

Anomalously long‐lived molecular negative ions of duroquinone

Khvostenko

Lukin

Tseplin

2012

Rapid Comm Mass Spectrometry

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The problem under investigation here is establishment of mechanisms of the resonant electron capture by molecules, using the example of duroquinone (2,3,5,6-tetramethyl-1,4-benzoquinone). A solution is important because it will provide new insights into the fundamental physical laws and widespread applications in various fields like molecular nanoelectronics, touched upon herein too. Resonant electron capture (REC) in duroquinone was studied with negative ion mass spectrometry of the REC as the main method, and UV absorption and the photoelectron spectroscopy as the auxiliary ones. The latter were used to study the electronic structures of the various neutral molecular states that are the parent ones for the negative molecular ions formed by electron attachment to the molecules. B3LYP/6-311 + G(d,p) calculations were widely used throughout the study. As a result, an intensive peak of the negative molecular ions with anomalously high lifetime (200 microseconds) was registered at the attached electron energy of 1.8 eV. The ions were determined to be quartets delaying the electron autodetachment because of spin prohibition and appearing via inter-system crossing from the negative molecular ion doublets produced in the core-excited Feshbach resonances. Finally, the pattern of the REC in duroquinone was obtained for the energy region of 1-4 eV which is presented by shape resonances, core-excited Feshbach resonances and by mechanisms little-known for molecules of inter-shell resonances and the formation of ion quartets. The latter were proposed to be related to the negative differential resistance in molecular nanoelectronics.

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“…The opportunity of operation with positive ions was retained; the block diagram of an instrument is given in Ref. 6. The quick switching between resonant electron capture mode and electron ionization mode was provided by changing the voltage polarity on the electrodes of ionic focusing system and magnetic field polarity of the analyzer electromagnet.…”

Section: Methodsmentioning

confidence: 99%

Rearrangement and predissociation processes in negative molecular ions of nitrobenzenes

et al. 2009

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The reactions of resonant electron capture by the molecules of benzene nitroderivatives has been studied in the gas phase. Some fragment negative ions were found to be unstable with respect to electron autodetachment. This circumstance has been used for the determination of their structure. In particular, it has been established that the low measured appearance energy of neutral component of [M-H](-) ion beam is a result of isomerization of nitrobenzenes' molecular ion, leading to the 2-nitrosophenol structure with the subsequent formation of the phenoxide anion in the autodetaching state. The effective yield curves of some types of fragment ions demonstrate fine vibrational structures, testifying the predissociation mechanism of ion formation. For all detected ions, the absolute cross sections of formation have been measured.

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Negative ion mass spectrum of the resonance electron capture by molecules of p-benzoquinone

Cited by 34 publications

References 10 publications

Resonant dissociative electron capture by the simplest amino acids and dipeptides

Resonant dissociative electron capture by the simplest amino acids and dipeptides

Anomalously long‐lived molecular negative ions of duroquinone

Rearrangement and predissociation processes in negative molecular ions of nitrobenzenes

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