Electron-Impact Excitation of Uracil Luminescence on a Ceramic Surface

Photoelectron spectroscopy was applied to pyrimidine nitrogenous bases, an important class of six-membered heterocyclic compounds incorporated into nucleic acids. The emission spectrum of uracil adsorbed on a ceramic surface that was obtained by bombardment with 600-eV electrons in a high vacuum was...

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Bibliographic Details
Published in:Journal of applied spectroscopy 2018-03, Vol.85 (1), p.32-36
Main Authors: Shafranyosh, I. I., Mitropolskiy, I. E., Kuzma, V. V., Svyda, Yu. Yu, Sukhoviya, M. I.
Format: Article
Language:English
Subjects:
Analysis
Analytical Chemistry
ATOMIC AND MOLECULAR PHYSICS
Atomic/Molecular Structure and Spectra
ELECTRON BEAMS
Electron bombardment
Electron impact excitation
Electron states
Electron transitions
EMISSION SPECTRA
FLUORESCENCE
Ground state
GROUND STATES
Heterocyclic compounds
High vacuum
Luminescence
Nucleic acids
PHOSPHORESCENCE
PHOTOELECTRON SPECTROSCOPY
PHOTOLUMINESCENCE
Physics
Physics and Astronomy
Pyrimidines
Spectrum analysis
Uracil
URACILS
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Summary:Photoelectron spectroscopy was applied to pyrimidine nitrogenous bases, an important class of six-membered heterocyclic compounds incorporated into nucleic acids. The emission spectrum of uracil adsorbed on a ceramic surface that was obtained by bombardment with 600-eV electrons in a high vacuum was analyzed. Broad bands with maxima at 335, 435, and 495 nm were observed in the UV and visible regions. The strongest band (λ = 335 nm) was attributed to fluorescence and corresponded to a singlet–singlet transition from the first excited electronic state into the molecular ground state. Electronic transitions from a triplet T 1 into the ground state formed a weaker phosphorescence band (λ = 435 nm). The nature of the band maximum at 495 nm is discussed. The obtained luminescence spectrum was compared with photoluminescence spectra in various phases.
ISSN:0021-9037
1573-8647
DOI:10.1007/s10812-018-0607-7