1
|
Charge Transfer and Electron Production in Proton Collisions with Uracil: A Classical and Semiclassical Study. Int J Mol Sci 2023; 24:ijms24032172. [PMID: 36768496 PMCID: PMC9916859 DOI: 10.3390/ijms24032172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2023] [Revised: 01/13/2023] [Accepted: 01/18/2023] [Indexed: 01/25/2023] Open
Abstract
Cross sections for charge transfer and ionization in proton-uracil collisions are studied, for collision energies 0.05<E<2500 keV, using two computational models. At low energies, below 20 keV, the charge transfer total cross section is calculated employing a semiclassical close-coupling expansion in terms of the electronic functions of the supermolecule (H-uracil)+. At energies above 20 keV, a classical-trajectory Monte Carlo method is employed. The cross sections for charge transfer at low energies have not been previously reported and have high values of the order of 40 Å2, and, at the highest energies of the present calculation, they show good agreement with the previous results. The classical-trajectory Monte Carlo calculation provides a charge transfer and electron production cross section in reasonable agreement with the available experiments. The individual molecular orbital contributions to the total electron production and charge transfer cross sections are analyzed in terms of their energies; this permits the extension of the results to other molecular targets, provided the values of the corresponding orbital energies are known.
Collapse
|
2
|
Abstract
A complete form of the post version of the continuum distorted wave (CDW) theory is used to investigate the single ionization of multielectronic atoms by fast bare heavy ion beams. The influence of the non-ionized electrons on the dynamic evolution is included through a residual target potential considered as a non-Coulomb central potential through a GSZ parametric one. Divergences found in the transition amplitude containing the short-range part of the target potential are avoided by considering, in that term exclusively, an eikonal phase instead of the continuum factor as the initial channel distortion function. In this way, we achieve the inclusion of the interaction between the target active electron and the residual target, giving place to a more complete theory. The present analysis is supported by comparisons with existing experimental electron emission spectra and other distorted wave theories.
Collapse
|
3
|
de Vera P, Abril I, Garcia-Molina R. Excitation and ionisation cross-sections in condensed-phase biomaterials by electrons down to very low energy: application to liquid water and genetic building blocks. Phys Chem Chem Phys 2021; 23:5079-5095. [DOI: 10.1039/d0cp04951d] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A model is presented for computing electron-impact electronic excitation and ionisation cross-sections for arbitrary condensed-phase biomaterials in a wide energy range, showing a general good agreement with the available experimental data.
Collapse
Affiliation(s)
- Pablo de Vera
- Departamento de Física – Centro de Investigación en Óptica y Nanofísica
- Universidad de Murcia
- Murcia
- Spain
- Currently at European Centre for Theoretical Studies in Nuclear Physics and Related Areas (ECT*)
| | - Isabel Abril
- Departament de Física Aplicada
- Universitat d’Alacant
- Alacant
- Spain
| | - Rafael Garcia-Molina
- Departamento de Física – Centro de Investigación en Óptica y Nanofísica
- Universidad de Murcia
- Murcia
- Spain
| |
Collapse
|
4
|
|
5
|
Bachi N, Otranto S, Otero GS, Olson RE. The role of multiple ionization of H 2O in heavy ion collisions. Phys Med Biol 2019; 64:205020. [PMID: 31487696 DOI: 10.1088/1361-6560/ab41db] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Collisional ionization processes involving H2O molecules and C6+, O8+, Si13+ ions are studied by means of the classical trajectory Monte Carlo method using molecular orbital calculations to define the ionization stages of the water molecule. Net total and single-differential cross sections in energy and angle are obtained by using a newly developed model that goes beyond the commonly applied one-active electron approximation. This model allows us to access the fraction of electron emission arising from single and multiple electron ionization. Calculated cross sections are contrasted and benchmarked against available experimental data at impact energies in the MeV/u range. The present results highlight the important role of multiple ionization in the emission of electrons where we find the majority of electrons emitted with energies greater than ~50 eV arise from multiple ionization collisions.
Collapse
Affiliation(s)
- N Bachi
- Instituto de Física del Sur (IFISUR), Departamento de Física, Universidad Nacional del Sur (UNS), CONICET, Av. L. N. Alem 1253, B8000CPB-Bahía Blanca, Argentina. Author to whom any correspondence should be addressed
| | | | | | | |
Collapse
|
6
|
Proton transport modeling in a realistic biological environment by using TILDA-V. Sci Rep 2019; 9:14030. [PMID: 31575875 PMCID: PMC6773879 DOI: 10.1038/s41598-019-50270-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Accepted: 09/05/2019] [Indexed: 12/17/2022] Open
Abstract
Whether it is in radiobiology to identify DNA lesions or in medicine to adapt the radiotherapeutic protocols, a detailed understanding of the radiation-induced interactions in living matter is required. Monte Carlo track-structure codes have been successfully developed to describe these interactions and predict the radiation-induced energy deposits at the nanoscale level in the medium of interest. In this work, the quantum-mechanically based Monte Carlo track-structure code TILDA-V has been used to compute the slowing-down of protons in water and DNA. Stopping power and range are then reported and compared with existing data. Then, a first application of TILDA-V to cellular irradiations is also reported in order to highlight the absolute necessity of taking into account a realistic description of the cellular environment in microdosimetry.
Collapse
|
7
|
Champion C, Quinto MA, Monti JM, Galassi ME, Weck PF, Fojón OA, Hanssen J, Rivarola RD. Water versus DNA: new insights into proton track-structure modelling in radiobiology and radiotherapy. Phys Med Biol 2015; 60:7805-28. [PMID: 26406277 DOI: 10.1088/0031-9155/60/20/7805] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Water is a common surrogate of DNA for modelling the charged particle-induced ionizing processes in living tissue exposed to radiations. The present study aims at scrutinizing the validity of this approximation and then revealing new insights into proton-induced energy transfers by a comparative analysis between water and realistic biological medium. In this context, a self-consistent quantum mechanical modelling of the ionization and electron capture processes is reported within the continuum distorted wave-eikonal initial state framework for both isolated water molecules and DNA components impacted by proton beams. Their respective probability of occurrence-expressed in terms of total cross sections-as well as their energetic signature (potential and kinetic) are assessed in order to clearly emphasize the differences existing between realistic building blocks of living matter and the controverted water-medium surrogate. Consequences in radiobiology and radiotherapy will be discussed in particular in view of treatment planning refinement aiming at better radiotherapy strategies.
Collapse
Affiliation(s)
- C Champion
- Université de Bordeaux, CNRS/IN2P3, Centre d'Etudes Nucléaires de Bordeaux Gradignan, Gradignan, France
| | | | | | | | | | | | | | | |
Collapse
|
8
|
Quinto MA, Monti JM, Week PF, Fojón OA, Hanssen J, Rivarola RD, Champion C. TILDA-V: A full-differential code for proton tracking in biological matter. ACTA ACUST UNITED AC 2015. [DOI: 10.1088/1742-6596/635/3/032063] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
9
|
de Vera P, Garcia-Molina R, Abril I. Angular and energy distributions of electrons produced in arbitrary biomaterials by proton impact. PHYSICAL REVIEW LETTERS 2015; 114:018101. [PMID: 25615504 DOI: 10.1103/physrevlett.114.018101] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Indexed: 06/04/2023]
Abstract
We present a simple method for obtaining reliable angular and energy distributions of electrons ejected from arbitrary condensed biomaterials by proton impact. Relying on a suitable description of the electronic excitation spectrum and a physically motivated relation between the ion and electron scattering angles, it yields cross sections in rather good agreement with experimental data in a broad range of ejection angles and energies, by only using as input the target composition and density. The versatility and simplicity of the method, which can be also extended to other charged particles, make it especially suited for obtaining ionization data for any complex biomaterial present in realistic cellular environments.
Collapse
Affiliation(s)
- Pablo de Vera
- Departament de Física Aplicada, Universitat d'Alacant, E-03080 Alacant, Spain
| | - Rafael Garcia-Molina
- Departamento de Física-Centro de Investigación en Óptica y Nanofísica, Regional Campus of International Excellence "Campus Mare Nostrum," Universidad de Murcia, E-30100 Murcia, Spain
| | - Isabel Abril
- Departament de Física Aplicada, Universitat d'Alacant, E-03080 Alacant, Spain
| |
Collapse
|
10
|
Palmans H, Rabus H, Belchior AL, Bug MU, Galer S, Giesen U, Gonon G, Gruel G, Hilgers G, Moro D, Nettelbeck H, Pinto M, Pola A, Pszona S, Schettino G, Sharpe PHG, Teles P, Villagrasa C, Wilkens JJ. Future development of biologically relevant dosimetry. Br J Radiol 2014; 88:20140392. [PMID: 25257709 DOI: 10.1259/bjr.20140392] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Proton and ion beams are radiotherapy modalities of increasing importance and interest. Because of the different biological dose response of these radiations as compared with high-energy photon beams, the current approach of treatment prescription is based on the product of the absorbed dose to water and a biological weighting factor, but this is found to be insufficient for providing a generic method to quantify the biological outcome of radiation. It is therefore suggested to define new dosimetric quantities that allow a transparent separation of the physical processes from the biological ones. Given the complexity of the initiation and occurrence of biological processes on various time and length scales, and given that neither microdosimetry nor nanodosimetry on their own can fully describe the biological effects as a function of the distribution of energy deposition or ionization, a multiscale approach is needed to lay the foundation for the aforementioned new physical quantities relating track structure to relative biological effectiveness in proton and ion beam therapy. This article reviews the state-of-the-art microdosimetry, nanodosimetry, track structure simulations, quantification of reactive species, reference radiobiological data, cross-section data and multiscale models of biological response in the context of realizing the new quantities. It also introduces the European metrology project, Biologically Weighted Quantities in Radiotherapy, which aims to investigate the feasibility of establishing a multiscale model as the basis of the new quantities. A tentative generic expression of how the weighting of physical quantities at different length scales could be carried out is presented.
Collapse
Affiliation(s)
- H Palmans
- 1 Acoustics and Ionising Radiation Division, National Physical Laboratory (NPL), Teddington, Middlesex, UK
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
11
|
Monti J, Tachino C, Hanssen J, Fojón O, Galassi M, Champion C, Rivarola R. Distorted wave calculations for electron loss process induced by bare ion impact on biological targets. Appl Radiat Isot 2014; 83 Pt B:105-8. [DOI: 10.1016/j.apradiso.2012.12.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2012] [Revised: 12/26/2012] [Accepted: 12/27/2012] [Indexed: 10/27/2022]
|
12
|
Champion C. Quantum-mechanical predictions of electron-induced ionization cross sections of DNA components. J Chem Phys 2013; 138:184306. [DOI: 10.1063/1.4802962] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
|
13
|
de Vera P, Garcia-Molina R, Abril I, Solov'yov AV. Semiempirical model for the ion impact ionization of complex biological media. PHYSICAL REVIEW LETTERS 2013; 110:148104. [PMID: 25167041 DOI: 10.1103/physrevlett.110.148104] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2012] [Indexed: 06/03/2023]
Abstract
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.
Collapse
Affiliation(s)
- Pablo de Vera
- Departament de Física Aplicada, Universitat d'Alacant, E-03080 Alacant, Spain and Frankfurt Institute for Advanced Studies, Ruth-Moufang-Strasse 1, 60438 Frankfurt am Main, Germany
| | - Rafael Garcia-Molina
- Departamento de Física-Centro de Investigación en Óptica y Nanofísica, Universidad de Murcia, E-30100 Murcia, Spain
| | - Isabel Abril
- Departament de Física Aplicada, Universitat d'Alacant, E-03080 Alacant, Spain
| | - Andrey V Solov'yov
- Frankfurt Institute for Advanced Studies, Ruth-Moufang-Strasse 1, 60438 Frankfurt am Main, Germany
| |
Collapse
|
14
|
Champion C, Weck PF, Lekadir H, Galassi ME, Fojón OA, Abufager P, Rivarola RD, Hanssen J. Proton-induced single electron capture on DNA/RNA bases. Phys Med Biol 2012; 57:3039-49. [DOI: 10.1088/0031-9155/57/10/3039] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|