Electron impact excitation of luminescence of uracil

Shafranyosh, І. І.; Стецович, В. В.; Chavarga, N. N.; Sukhoviya, M. I.

doi:10.1134/s0030400x12010183

Cited by 3 publications

(2 citation statements)

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“…To date the only spectral information following such electron bombardment consists of observations in the visible and near-UV spectral regions where the data are dominated by radiation from molecular fragments. Target molecules studied include uracil, cytosine adenine and thymine [14][15][16][17][18]. In the present work we investigate the break-up of the thymine molecule into excited atomic fragments.…”

Section: Introductionmentioning

confidence: 99%

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VUV study of electron impact dissociative excitation of thymine

Tiessen

Trocchi

Hein

et al. 2016

J. Phys. B: At. Mol. Opt. Phys.

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A crossed electron-gas beam system coupled to a VUV spectrometer has been used to investigate the dissociation of thymine into excited atomic fragments in the impact energy range from threshold to 400 eV. The main features in the spectrum are the H Lyman series lines. The relative emission cross section of Lyman-α has a broad maximum at an energy of 160 eV. The probability of extracting excited C, N or O atoms from the parent molecule is shown to be very small. Possible dissociation channels and excitation mechanisms in the parent molecule are discussed.

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Section: Introductionmentioning

confidence: 99%

“…Wavelengths longer than 300 nm were investigated. Target molecules studied include uracil, cytosine, adenine and thymine [16][17][18][19][20]. In this work we study the dissociation of the thymine molecule into excited atomic fragments.…”

Section: Introductionmentioning

confidence: 99%

VUV study of electron impact dissociative excitation of thymine

Tiessen

Trocchi

Hein

et al. 2016

J. Phys. B: At. Mol. Opt. Phys.

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Molecule Relaxation

Obodovskiy¹

2019

Radiation

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Fragmentation of the adenine and guanine molecules induced by electron collisions

Минаев

Shafranyosh

Svida

et al. 2014

The Journal of Chemical Physics

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Secondary electron emission is the most important stage in the mechanism of radiation damage to DNA biopolymers induced by primary ionizing radiation. These secondary electrons ejected by the primary electron impacts can produce further ionizations, initiating an avalanche effect, leading to genome damage through the energy transfer from the primary objects to sensitive biomolecular targets, such as nitrogenous bases, saccharides, and other DNA and peptide components. In this work, the formation of positive and negative ions of purine bases of nucleic acids (adenine and guanine molecules) under the impact of slow electrons (from 0.1 till 200 eV) is studied by the crossed electron and molecular beams technique. The method used makes it possible to measure the molecular beam intensity and determine the total cross-sections for the formation of positive and negative ions of the studied molecules, their energy dependences, and absolute values. It is found that the maximum cross section for formation of the adenine and guanine positive ions is reached at about 90 eV energy of the electron beam and their absolute values are equal to 2.8 × 10(-15) and 3.2 × 10(-15) cm(2), respectively. The total cross section for formation of the negative ions is 6.1 × 10(-18) and 7.6 × 10(-18) cm(2) at the energy of 1.1 eV for adenine and guanine, respectively. The absolute cross-section values for the molecular ions are measured and the cross-sections of dissociative ionization are determined. Quantum chemical calculations are performed for the studied molecules, ions and fragments for interpretation of the crossed beams experiments.

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Electron impact excitation of luminescence of uracil

Cited by 3 publications

References 4 publications

VUV study of electron impact dissociative excitation of thymine

VUV study of electron impact dissociative excitation of thymine

Molecule Relaxation

Fragmentation of the adenine and guanine molecules induced by electron collisions

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