Absolute effective cross sections of ionization of adenine and guanine molecules by electron impact

Shafranyosh, І. І.; Svida, Yu. Yu.; Sukhoviya, M. I.; Shafranyosh, M. I.; Минаев, Б. Ф.; Baryshnikov, Gleb V.; Минаева, В. А.

doi:10.1134/s1063784215100278

Cited by 8 publications

(18 citation statements)

References 13 publications

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“…The authors of work [36] used the BEB model to calculate the electron-impact single-ionization cross-sections for the uracil (C cytosine, and 1.457×10 −15 cm 2 at an energy of 85 eV for uracil molecules. Those data are in good agreement with the results of work [35]. They are also close to our results.…”

Section: Calculation Of Total Single-ionization Cross-sections Of Glutamine and Glutamic Acid Moleculessupporting

confidence: 93%

“…the removal of an electron, leads to a weakening of the bonds in the molecular ion as compared to the neutral molecule. The most intensive peak of the ionic fragment with / = 84 can be formed owing to the loss of the COOH group, as well as hydrogen and oxygen atoms (see also the appearance energies and estimations in work [35]):…”

Section: Mass Spectramentioning

confidence: 99%

“…The more comprehensive analysis of processes ( 1)-( 12) making use of theoretical calculations of the energies, lengths, and binding energies for parent and daughter ionic fragments, as well as neutral molecules, should be a result of the separate study [38][39][40][41] similar to that perfomed for the photoionization [8] and electron-impact ionization [35] processes.…”

Section: Mass Spectramentioning

confidence: 99%

“…In work [35], the total electron-impact ionization cross-sections of such biomolecules as adenine (C 5 H 5 N 5 ) and guanine (C 5 H 5 N 5 O) were measured at energies from their thresholds to 200 eV. The cited authors also estimated the magnitude of the partial cross-sections for the formation of various ionic fragments at the dissociative ionization of the indicated molecules.…”

Section: Calculation Of Total Single-ionization Cross-sections Of Glutamine and Glutamic Acid Moleculesmentioning

confidence: 99%

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Іонізація Електронами Молекул Глютамінової Кислоти Та Глютаміну

Zavilopulo

Demes²,

Remeta

et al. 2021

Ukr. J. Phys.

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Проведено комплекснi (експериментальнi i теоретичнi) дослiдження виходу позитив-них iонiв молекул глютамiнової кислоти (Glu-Acid) i глютамiну (Gln) в газовiй фазi, утворених в результатi дисоцiативної iонiзацiї цих амiнокислот електронним ударом. Експеримент проводився на установцi з монопольним мас-спектрометром ти-пу MX-7304A в дiапазонi масових чисел 10–150 Da. Дослiджено мас-спектри молекул глютамiнової кислоти i глютамiну при рiзних температурах, динамiку виходу iонiв-фрагментiв в iнтервалi температур випаровування вихiдної речовини 310–430 К та детально проаналiзовано особливостi процесiв утворення iонiв-фрагментiв таких молекул електронним ударом. Проведено ab initio розрахунки потенцiалiв iонiзацiї глютамiнової кислоти i глютамiну в адiабатичному наближеннi та за енергiями зв’язку HOMO- i LUMO-орбiталей нейтральних молекул. Отримано сумарнi перерiзи одноелектронної iонiзацiї обох молекул електронним ударом в Binary-Encounter-Bethe моделi та за формулою Гризiнського. Показано, що розрахованi молекулярнi константи добре узгоджуються з отриманими експериментальними даними.

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Section: Calculation Of Total Single-ionization Cross-sections Of Glutamine and Glutamic Acid Moleculessupporting

confidence: 93%

Section: Mass Spectramentioning

confidence: 99%

Section: Mass Spectramentioning

confidence: 99%

Section: Calculation Of Total Single-ionization Cross-sections Of Glutamine and Glutamic Acid Moleculesmentioning

confidence: 99%

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Іонізація Електронами Молекул Глютамінової Кислоти Та Глютаміну

Zavilopulo

Demes²,

Remeta

et al. 2021

Ukr. J. Phys.

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show abstract

“…Вивчено процес утворення негативних іонів молекулярних компонентів нуклеїнових кислот в інтервалі енергій електронів 0-12 еВ [14,[19][20][21][26][27][28][29][30]. У прямому експерименті визначено абсолютні величини та енергетичні залежності повних перерізів утворення негативних іонів молекул цитозину, тиміну, урацилу, аденіну та гуаніну.…”

Section: результати та обговоренняunclassified

Molecular mechanisms of influence of slow electrons on biological structures

2019

Biophysical Bulletin

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Background: The article reviews investigations carried out by biophysicists of the Transcarpathian Branch of the Ukrainian Biophysical Society, dedicated to the memory of the prominent Ukrainian biophysicist, Professor Yuri Pavlovich Blagoi. Objectives: Study of the peculiarities of physical processes and structural changes in nucleic acid molecules initiated by low-energy electrons (10-1-102 eV). Materials and methods: Molecular components of nucleic acids – nucleobases, nucleosides – were chosen as objects of research. A complex of methods is applied: the spectral method for obtaining the luminescence spectra of molecules excited by an electron impact; the electric method in determining the complete cross-sections of the formation of positive and negative ions; the method of gas-phase mass spectrometry with electron impact ionization. A new approach is proposed, which is based on the development of the methods for obtaining biomolecules in an isolated (gas) state, the formation of molecular beams, and the implementation of a crossed electron and molecular beams method. Results: The processes of excitation, ionization and fragmentation of molecules of nucleic acid bases under electron impact are investigated. The radiation spectra of biomolecules in the wavelength region from 200 nm to 500 nm for different energies of incident electrons are obtained. For identification of spectral bands, the excitation functions of biomolecules are investigated, mass spectrometry analysis of the bases is performed, semi-empirical quantum-chemical calculations of structural parameters are carried out. It is established that the complex superpositional nature of the spectra reflects the simultaneous occurrence of various physical processes, including, in addition to the direct excitation of the singlet and triplet states of the base molecules, the dissociation excitation and excitation of ionized biomolecules and their fragments. The analysis of the excitation functions shows the presence of intersystem transitions with the formation of triplet metastable states of the nucleic acid bases molecules. It is shown that the processes of the appearance of negative ions are of resonant nature and are accompanied by the dissociation of molecules even at energies smaller than the thresholds for excitation and ionization.

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