Vacuum ultraviolet photoemission studies of nucleic acid bases

Pong, W.; Inouye, C. S.

doi:10.1063/1.323182

Cited by 18 publications

(3 citation statements)

References 13 publications

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“…[5][6][7][8][9][10] Their photoelectron spectra contain close lying and overlapping valence electronic bands. To further complicate the interpretation of these spectra, some of the nucleobases, such as cytosine, have multiple thermally accessible tautomers in the gas phase, as opposed to the one stable conformation in the solid phase.…”

Section: Introductionmentioning

confidence: 99%

High-resolution photoelectron spectra of the pyrimidine-type nucleobases

Fulfer

Hardy

Aguilar

et al. 2015

The Journal of Chemical Physics

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High-resolution photoelectron spectra of the gas phase pyrimidine-type nucleobases, thymine, uracil, and cytosine, were collected using synchrotron radiation over the photon energy range 17 ≤ hν ≤ 150 eV. These data provide the highest resolution photoelectron spectra of thymine, uracil, and cytosine published to date. By comparing integrated regions of the energy dependent photoelectron spectra of thymine, the ionization potentials of the first four ionic states of thymine were estimated to be 8.8, 9.8, 10.3, and 10.8 eV. The thymine data also show evidence for low energy shape resonances in three of the outermost valence electronic states. Comparing the uracil spectrum with the thymine spectrum, the four outermost valence electronic states of uracil likely begin at binding energies 9.3, 9.9, 10.5, and 11.0 eV. High-resolution spectra indicate only one tautomeric form of cytosine contributes significantly to the spectrum with the four outermost valence electronic states beginning at binding energies 8.9, 9.9, 10.4, and 10.85 eV.

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Section: Introductionmentioning

confidence: 99%

High-resolution photoelectron spectra of the pyrimidine-type nucleobases

Fulfer

Hardy

Aguilar

et al. 2015

The Journal of Chemical Physics

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“…In addition to optical studies of the type reported here, luminescence from the nucleic acid bases when excited in the vacuum UV spectral region have been studied (Vinogradov et al, 1974). Pong and Inouye (1976) have made a series of photoemission studies in which they measured the photoelectron number distribution and quantum yield for a number of the bases. Finally, using a scintillator material as the substrate, Hou and Rampling (1976) have been able to measure the transmission of thin films of uracil up to 21 eV.…”

Section: Resultsmentioning

confidence: 99%

THE OPTICAL PROPERTIES OF ADENINE FROM 1.8 TO 80 eV*

Arakawa

Emerson

Juan

et al. 1986

Photochem & Photobiology

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Experimental measurements of the optical reflectance of solid adenine films have been obtained for photon energies extending from 1.8 to 80 eV. From these data we have established the complex index of refraction, the complex dielectric function, and the energy‐loss function Im(‐l/). Structure in the dielectric functions are ascribed to * transitions at photon energies less than ~9 eV and to * transitions at higher energies. A broad peak in the energy‐loss function near 24 eV is associated with a collective resonance involving all the valence electrons. Sum rule calculations are used to demonstrate the overall consistency of the data.

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“…The formation of two types of complexescharge transfer complexes and ion-radical salts-is observed for 9-methyladenine in a thin film and during the complex crystallization from a polar solvent [18], respectively. It is thus assumed that during crystallization the ionization potentials I, tending to coincide with I, change for the condensed state as compared to the gas phase [19]. This enhances the extent of overlapping between the higher occupied donor orbital and the lower vacant acceptor orbital, which results in charge transfer in the ground state and the ion-radical salt formation.…”

Section: Resultsmentioning

confidence: 99%

Charge transfer interactions between nucleic acid bases and strong acceptors

Sheina

Radchenko

Egupov

et al. 1979

Int J of Quantum Chemistry

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The regularities of the donor-acceptor interaction of nucleic acid bases and some of their derivatives with the strong acceptor 7,7,8,8-tetracyanoquinodimethane (TCNQ) in thin amorphous films at 77 K were studied using CJV and visible spectroscopy. Purine and pyrimidine bases are shown to form charge transfer TCNQ complexes whose band energies hv,, = Zp -EA -(H* -H") are linearly dependent of the donor ionization potential I,. Calculated differences between the interaction energies of uncharged molecules and ion radicals, AE = 3.0 eV, are in good agreement with experimental variations of the complex dissociation energies in the ground and excited states, (H* -H") = 2.73 eV. Annealing of the films of complexes containing cytosine, 1-methylcytosine, uracil, and caffeine leads to ordering of their structure and the formation of ion radical salts.

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Vacuum ultraviolet photoemission studies of nucleic acid bases

Cited by 18 publications

References 13 publications

High-resolution photoelectron spectra of the pyrimidine-type nucleobases

High-resolution photoelectron spectra of the pyrimidine-type nucleobases

THE OPTICAL PROPERTIES OF ADENINE FROM 1.8 TO 80 eV*

Charge transfer interactions between nucleic acid bases and strong acceptors

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