THE OPTICAL PROPERTIES OF ADENINE FROM 1.8 TO 80 eV*

Arakawa, E. T.; Emerson, L.C.; Juan, Sun; Ashley, J. C.; Williams, M. W.

doi:10.1111/j.1751-1097.1986.tb04674.x

Cited by 25 publications

(7 citation statements)

References 32 publications

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“…33,48,[60][61][62] As an illustration of a typical biomaterial, Fig. 1(b) depicts the experimental optical ELF of adenine from 0 to 50 eV (circles), 57 together with the prediction of the above mentioned parametric predictive model for biomaterials (dashed line) 39 and the fitting to the experimental data by means of the MELF-GOS method (solid line). 38 Electronic excitations start to appear for energy transfers E greater or equal than the first excitation threshold E th , while ionisation processes will occur for larger energy transfers.…”

Section: Electronic Excitation and Ionisation Of Biomaterials By Swifmentioning

confidence: 99%

“…The mean binding energy for outer shell electrons can be easily estimated from the ionisation energies for biomolecules reported in the literature, most frequently coming from quantum chemistry calculations. 16,49,50 In previous works for ion impact, 28,30 B out was calculated as a direct average of the binding energies B i of the target outer shell electrons, Circles are experimental data for solid adenine, 57 the solid line represents the MELF-GOS calculation, 38 whereas the dashed line corresponds to the predictive parametric model 39 (with a threshold energy E th ).…”

Section: Mean Binding Energy For Outer-shell Electronsmentioning

confidence: 99%

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Excitation and ionisation cross-sections in condensed-phase biomaterials by electrons down to very low energy: application to liquid water and genetic building blocks

Vera

Abril

García-Molina

2021

Phys. Chem. Chem. Phys.

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Section: Electronic Excitation and Ionisation Of Biomaterials By Swifmentioning

confidence: 99%

Section: Mean Binding Energy For Outer-shell Electronsmentioning

confidence: 99%

Excitation and ionisation cross-sections in condensed-phase biomaterials by electrons down to very low energy: application to liquid water and genetic building blocks

Vera

Abril

García-Molina

2021

Phys. Chem. Chem. Phys.

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“…In Fig. 1 we compare the experimentally determined optical ELF of four condensed organic compounds [20][21][22][23] with the results obtained through Eq. (2).…”

mentioning

confidence: 99%

Semiempirical Model for the Ion Impact Ionization of Complex Biological Media

et al. 2013

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We present a semiempirical model for calculating the electron emission from any organic compound after ion impact. With only the input of the density and composition of the target we are able to evaluate its ionization cross sections using plausible approximations. Results for protons impacting in the most representative biological targets (such as water or DNA components) show a very good comparison with experimental data. Because of its simplicity and great predictive effectiveness, the method can be immediately extended to any combination of biological target and charged particle of interest in ion beam cancer therapy. DOI: 10.1103/PhysRevLett.110.148104 PACS numbers: 87.53.Àj, 79.20.Àm, 87.14.gk, 87.56.Àv Secondary electron emission is a key step in the mechanism of radiation damage to biomolecular systems induced by ion impact. As a matter of fact, ion beam cancer therapy exploits the particular properties of ion tracks, in which the ionization yield reaches a maximum near the end of their trajectories (the Bragg peak), allowing a precise and narrow energy deposition in deep-seated tumors, minimizing the radiation effects in healthy surrounding tissues [1]. These ejected electrons can produce further ionizations, initiating an avalanche effect, leading to the energy transfer to sensitive biomolecular targets, such as DNA or proteins. But not only is the number of emitted electrons relevant, but also their energy spectrum, since, although high energy electrons are those capable of producing further ionizations, it has been shown that low energy electrons (below ionization threshold) can also produce damage to biomolecules by dissociative electron attachment [2,3].In order to reach a deeper understanding of ion beam cancer therapy from a fundamental point of view, a great amount of data is needed regarding several and very diverse processes, since the whole mechanism implies steps in very different energy, space, and time scales. Therefore, the problem must be studied within a multiscale approach [4], a fact that motivates an interdisciplinary effort within the European COST Action Nano-IBCT (Nanoscale insights into ion beam cancer therapy) to build a comprehensive database [5]. In this context, ionization data for a wide variety of projectile and organic target combinations, covering a broad range of incident and ejected energies, is needed in order to get insight into micro-and nanometric aspects of radiation damage to biomolecular systems. The aim of this Letter is to present a simple theoretical method that provides the above mentioned required ionization data with the use of little input information, based on the dielectric formalism [6] and some physically motivated approximations. Results are here presented for proton impact, although the methodology can be immediately extended to heavier ions, electrons, and other charged particles.Although several simple theoretical and semiempirical methods already exist nowadays to calculate the energy spectra of secondary electrons [7] (and are currently in us...

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“…Optical oscillator-strength and related data have been measured extensively for a variety of organic and biological molecules in the condensed phase [33,34,35]. An important role of superexcited states has been considered also in the VUV photolysis of biological systems using SR [36].…”

Section: Cross-sections For Molecules In the Condensed Phasementioning

confidence: 99%

Interaction of photons with molecules - cross-sections for photoabsorption, photoionization, and photodissociation

Hatano¹

1999

Radiation and Environmental Biophysics

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A survey is given of recent progress in measurements of photoabsorption, photoionization, and photodissociation cross-sections of molecules in the wavelength range of photons in the vacuum ultraviolet (VUV), where the optical oscillator-strengths of most molecules are predominantly distributed. Some remarks are presented on molecules in the condensed phase. Particular emphasis is placed on the current understanding of spectroscopy and dissociation dynamics of molecules in the superexcited states which are produced through the interaction of photons in this wavelength range. In the VUV range, most of the observed super-excited states are assigned to high-Rydberg states which are vibrationally (and/or rotationally), doubly, or inner-core excited, and converge to each of the ion states.

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THE OPTICAL PROPERTIES OF ADENINE FROM 1.8 TO 80 eV*

Cited by 25 publications

References 32 publications

Excitation and ionisation cross-sections in condensed-phase biomaterials by electrons down to very low energy: application to liquid water and genetic building blocks

Excitation and ionisation cross-sections in condensed-phase biomaterials by electrons down to very low energy: application to liquid water and genetic building blocks

Semiempirical Model for the Ion Impact Ionization of Complex Biological Media

Interaction of photons with molecules - cross-sections for photoabsorption, photoionization, and photodissociation

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