The damage induced by the impact of low energy electrons (LEE) on 
biomolecules is reviewed from a radiobiological perspective with emphasis on 
transient anion formation. The major type of experiments, which measure the 
yields of fragments produced as a function of incident electron energy 
(0.1-30 eV), are briefly described. Theoretical advances are also 
summarized. Several examples are presented from the results of recent 
experiments performed in the gas-phase and on biomolecular films bombarded 
with LEE under ultra-high vacuum conditions. These include the results 
obtained from DNA films and those obtained from the fragmentation of 
elementary components of the DNA molecule (i.e., the bases, sugar and 
phosphate group analogs and oligonucleotides) and of proteins (e.g. amino 
acids). By comparing the results from different experiments and theory, it 
is possible to determine fundamental mechanisms that are involved in the 
dissociation of the biomolecules and the production of single- and 
double-strand breaks in DNA. Below 15 eV, electron resonances (i.e., the 
formation of transient anions) play a dominant role in the fragmentation of 
all biomolecules investigated. These transient anions fragment molecules by 
decaying into dissociative electronically excited states or by dissociating 
into a stable anion and a neutral radical. These fragments can initiate 
further reactions within large biomolecules or with nearby molecules and 
thus cause more complex chemical damage. Dissociation of a transient anion 
within DNA may occur by direct electron attachment at the location of 
dissociation or by electron transfer from another subunit. Damage to DNA is 
dependent on the molecular environment, topology, type of counter ion, 
sequence context and chemical modifications.

/pdf/low-energy-electron-driven-damage-in-biomolecules-5cn6qjrfa5.pdf

Low energy electron-driven damage in biomolecules

The importance of comets for the origin of life on Earth has been advocated for many decades. Amino acids are key ingredients in chemistry, leading to life as we know it. Many primitive meteorites contain amino acids, and it is generally believed that these are formed by aqueous alterations. In the collector aerogel and foil samples of the Stardust mission after the flyby at comet Wild 2, the simplest form of amino acids, glycine, has been found together with precursor molecules methylamine and ethylamine. Because of contamination issues of the samples, a cometary origin was deduced from the 13C isotopic signature. We report the presence of volatile glycine accompanied by methylamine and ethylamine in the coma of 67P/Churyumov-Gerasimenko measured by the ROSINA (Rosetta Orbiter Spectrometer for Ion and Neutral Analysis) mass spectrometer, confirming the Stardust results. Together with the detection of phosphorus and a multitude of organic molecules, this result demonstrates that comets could have played a crucial role in the emergence of life on Earth.

https://advances.sciencemag.org/content/advances/2/5/e1600285.full.pdf

Prebiotic chemicals—amino acid and phosphorus—in the coma of comet 67P/Churyumov-Gerasimenko

Journal of Applied Spectroscopy | HomeNuclear Instruments and Methods in Physics Research Atomic Physics authors/titles recent submissionsHome IOP PublishingPhysics Reports Journal ElsevierJournal WikipediaApplied Physics B | HomeThe European Physical Journal D (EPJ D)Chinese Physics B IOPscienceUkrainian Journal of PhysicsJournal of the Optical Society of America B JOSA BInternational Journal of Modern Physics B World ScientificJournal rankings for ARC, all 01* categories sorted Physics WikipediaInternational Scholarly Research Notices | HindawiAbbreviations A B Bioscience Journal Abbreviations Physical Review BEPJ European Physical JournalJournal of Vacuum Science & Technology BScitation HomeInternational Journal of Modern Physics E World ScientificJournal of Physics B: Atomic, Molecular and Optical The European Physical Journal B (EPJ B)Physical Review AAuthors Scientific Papers GS JournalJournal of Physics: Conference Series Latest Impact Factor Canadian Journal of Physics Canadian Science PublishingNuclear Physics B | Journal | ScienceDirect.com by Elsevier International Journal of Modern Physics E. Nuclear Physics. ISSN (print): 0218-3013 | ISSN (online Polarizability effects in atomic nuclei J. N. Orce Vol to provide the scientific background for future joint projects between the experts from these diverse areas in hadron physics. (Read full article.) Neutron star equations of state and GS Journal is your leading platform for high quality science journals, scientific papers and peer-reviewed full-text journals />07-12-2021 � The European Physical Journal D (EPJ D) presents new and original research results in Atomic, Molecular, Optical and Plasma Physics29-11-2021 � Editors' Choice Canadian Journal of Physics Cross sections and ionization rates are atomic data that have important applications in astrophysics and plasma physics. This work aims to calculate the electron impact ionization cross sections of some helium-like ions using the relativistic distorted wave method implemented in Flexible Atomic Code.Nuclear Physics B focuses on the domain of high energy physics, quantum field theory, statistical systems, and mathematical physics, and includes four main sections: high energy physics phenomenology, high energy physics theory, high energy physics experiment, and quantum field theory, ⋯. Read more18-08-2021 � Title abbreviations for journals in the areas of biology and chemistry. Bioscience journal title abbreviations A B.The American Physical Society (APS) is delighted to announce the appointment of David Scanlon, Professor of Computational Materials Design, University College of London, United Kingdom, to the role of Lead Editor of PRX Energy, APS’s new, highly selective, open access journal covering energy science and technology.Professor Scanlon will serve as the inaugural Lead Editor of ⋯15-12-2021 � Journal Impact IF Ranking � In the Physics and Astronomy (all) research field, the Quartile of Journal of Physics: Conference Series is Q4. Journal of Physics: Conference Series has been ranked #191 over 233 related journals in the Physics and Astronomy (all) research category. 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Shaping the Understanding the nature of the forces that both control and result from the molecular and atomic arrangements in matter will help shed light on chemical interactions in nature and can therefore lead to cures for disease.Physics is the natural science that studies matter, its fundamental constituents, its motion and behavior through space and time, and the related entities of energy and force. Physics is one of the most fundamental scientific disciplines, and its main goal is to understand how the universe behaves.. Physics is one of the oldest academic disciplines and, through its inclusion of ⋯Chinese Physics B is an international journal covering the latest developments and achievements in all branches of physics (with the exception of nuclear physics and physics of elementary particles and fields, which is covered by Chinese Physics C).Topic Scope: JOSA B emphasizes scientific research on the fundamentals of the interaction of light with matter such as quantum optics, nonlinear optics, and laser physics. Topics include atom optics and cold atoms, integrated and fiber optics, metamaterials, nanophotonics, photonic crystals, photorefractive optics and holography, physics of optical materials, spectroscopy, ⋯Journal of Physics B: Atomic, Molecular and Optical Physics covers the study of atoms, ions, molecules and clusters, and their structure and interactions with particles, photons or fields. Submit an article opens in new tab Track my article opens in new tab. RSS. Sign up for Phys. Rev. B 104, 174443 (2021) Quantized phase-coherent heat transport of counterpropagating Majorana modes Alexander G. Bauer et al. Phys. Rev. B 104, L201410 (2021) Soft-mode anisotropy in the negative thermal expansion material ReO 3 Tobias A. Bird et al. Phys. Rev. B 104, 214102 (2021) Critical drag as a mechanism for resistivityInternational Journal of Modern Physics B Condensed Matter Physics; Statistical Physics; Atomic, Molecular and Optical Physics ISSN (print): 0217-9792 | ISSN (online): 1793-6578We publish academic journals, as well as books and conference proceedings. All our academic publications are hosted on IOPscience, a platform specifically designed to help readers access scientific, technical and medical content quickly and easily.. We also provide expert science journalism through Physics World, a trusted source of science news.04-11-2021 � Journal of Applied Spectroscopy reports on key applications of spectroscopy in, physics, chemistry , material science, medicine, biology, ecology and spectral instrument-industry . An increasing number of papers presented here focus on the theory of lasers, as well as on the tremendous potential for the practical applications of lasers in numerous fields and industries.A journal, from the Old French journal (meaning "daily"), may refer to: . Bullet journal, a method of personal organizations; Diary, a record of what happened over the course of a day or other period; Daybook, also known as a general journal, a daily record of financial transactions; Logbook, a record of events important to the operation of a vehicle, facility, or otherwise29-11-2021 � EPJ B Topical Issue: Recent developments in the functional renormalization group approach to correlated electron systems ; EPJ D Topical Issue: Advances in Multi-Scale Modelling of Intense Electronic Excitation Processes ; EPJ D Topical Issue: Atomic, Molecular and Optical Techniques for Fundamental PhysicsInternational Journal of Differential Equations. Journal metrics. Acceptance rate 25%. Submission to final decision 46 days. Acceptance to publication 47 days. CiteScore 1.900. Journal Citation Indicator 0.520. Impact Factor-APC $1025. International Journal of Microbiology. Journal metrics.14-12-2021 � Publishing essential research results in two of the most important areas of applied physics, both Applied Physics sections figure among the top most cited journals in this field. In addition to regular papers Applied Physics B: Lasers and Optics features invited reviews. Fields of topical interest are covered by feature issues.02-05-2017 � Physics Reports keeps the active physicist up-to-date on developments in a wide range of topics by publishing timely reviews which are more extensive than just literature surveys but normally less than a full monograph. Each report deals with one specific subject and is generally published in a separate volume. These reviews are specialist in nature but contain ⋯NIMB or Section B of Nuclear Instruments and Methods in Physics Research covers all aspects of the interaction of energetic beams with atoms, molecules and aggregate forms of matter. This includes ion beam analysis and ion beam modification of materials as well as basic data of importance for ⋯ Read more13-11-2021 � The European Physical Journal B Statistical and Nonlinear Physics First-passage time and change of entropy. V. V. Ryazanov. Eur. Phys. J. B, 94 12 (2021) 242. Published online: 11 December 2021. DOI: 10.1140/epjb/s10051 12th International Conference on Atomic and Molecular Data and Their Applications 25-29 September 2022 12-08-2021 � Subjects: Atomic Physics (physics.atom-ph); Chemical Physics (physics.chem-ph); Quantum Physics (quant-ph) [8] arXiv:2108.05996 [ pdf , other ] Title: Ultracold $^{88}\rm{Sr}_2$ molecules in the absolute ground state Copyright code : f0a76c2d68cb7e7cb469c606fb9f8c72

Journal of Physics B: atomic, molecular and optical physics

Collisions of 0--4 eV electrons with thin DNA films are shown to produce single strand breaks. The yield is sharply structured as a function of electron energy and indicates the involvement of ${\ensuremath{\pi}}^{*}$ shape resonances in the bond breaking process. The cross sections are comparable in magnitude to those observed in other compounds in the gas phase in which ${\ensuremath{\pi}}^{*}$ electrons are transferred through the molecule to break a remote bond. The results therefore support aspects of a theoretical study by Barrios et al. [J. Phys. B 106, 7991 (2002)] indicating that such a mechanism could produce strand breaks in DNA.

/pdf/dna-strand-breaks-induced-by-0-4-ev-electrons-the-role-of-1ngkm1xm4r.pdf

DNA strand breaks induced by 0-4 eV electrons: the role of shape resonances.

Quantum tunneling between two plasmonic resonators links nonlinear quantum optics with terahertz nanoelectronics. We describe the direct observation of and control over quantum plasmon resonances at length scales in the range 0.4 to 1.3 nanometers across molecular tunnel junctions made of two plasmonic resonators bridged by self-assembled monolayers (SAMs). The tunnel barrier width and height are controlled by the properties of the molecules. Using electron energy-loss spectroscopy, we directly observe a plasmon mode, the tunneling charge transfer plasmon, whose frequency (ranging from 140 to 245 terahertz) is dependent on the molecules bridging the gaps.

https://science.sciencemag.org/content/sci/343/6178/1496.full.pdf

Quantum plasmon resonances controlled by molecular tunnel junctions.

Dissociative electron attachment in uracil: Total anion yield

We investigate the causes of electron-circular dichroism (ECD) in bromocamphor and dibromocamphor, focusing specifi cally on the electron helicity density of the target. Using electron transmission spectroscopy (ETS) and quantum chemical calculations, we have observed and assigned temporary negative ion states of bromocamphor and dibromocamphor. Further calculations were conducted to determine the helicity densities of these compounds. Large helicity densities are found in the regions of large wavefunction amplitude of the normally unoccupied molecular orbitals responsible for resonances in the scattering cross sections. We relate our ETS assignments and helicity density results to the chiral asymmetry data observed in electron-circular dichroism experiments by the Munster group (Nolting et al 1997 J. Phys. B: At. Mol. Opt. Phys. 30, 5491). Our results support helicity density as a possible source of chiral asymmetry at certain resonance positions in bromocamphor and dibromocamphor.

/pdf/an-investigation-of-electron-helicity-density-in-412zj3d4cv.pdf

An investigation of electron helicity density in bromocamphor and dibromocamphor as a source of electron circular dichroism

Electron scattering studies are used to locate the energies of temporary negative ion states of three chloro-substituted molecular families of herbicidal importance: salicylic and phenoxyacetic acids and acetamides. The correlation between these energies and the computed virtual orbital energies of the compounds is examined and used to put the latter on an absolute energy scale. Such scaling of orbital energies permits the anion states of other members of these families, for which experimental data may not be available, to be estimated from the calculated orbital energies. Studies of electron reduction rates often rely on calculated LUMO energies as molecular descriptors. The use of measured anion energies as well as appropriately scaled orbital energies should serve to improve such studies in these and in related herbicides.

/pdf/temporary-anion-states-of-three-herbicide-families-507qjjw5yw.pdf

Temporary Anion States of Three Herbicide Families

/pdf/an-investigation-of-electron-helicity-density-in-3jh20ovrr5.pdf

We have measured the total electron scattering cross sections of several NMR shift reagent molecules X(hfc)3, where X = Yb, Er, Eu and Pr, by means of electron transmission spectroscopy (ETS) to determine their vertical attachment energies. A strong low-energy resonance (<1 eV) is observed in all of the compounds except for Yb(hfc)3. We explain this anomaly in terms of the ground-state electron configuration of each molecule. Also, with the aid of restricted open-shell Hartree−Fock (ROHF) calculations on analogous molecules with truncated fluorocarbon chains, we have assigned specific normally unoccupied orbitals to the resonances observed in ETS. To our knowledge, these molecules are the largest for which this procedure has been successfully completed. Nolting et al. (J. Phys. B 1997, 30, 5491) have demonstrated that the above NMR shift reagents exhibit electron circular dichroism (ECD) between 1 and 10 eV. Using our new total cross section data, we comment on the possibility of resonance involvement in ...

Assignments of normally unoccupied orbitals to the temporary negative ion states of several lanthanide NMR shift reagents and comments on resonance involvement in electron circular dichroism.

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Dissociative electron attachment in uracil: Total anion yield

An investigation of electron helicity density in bromocamphor and dibromocamphor as a source of electron circular dichroism

Temporary Anion States of Three Herbicide Families

An investigation of electron helicity density in bromocamphor and dibromocamphor as a source of electron circular dichroism

Assignments of normally unoccupied orbitals to the temporary negative ion states of several lanthanide NMR shift reagents and comments on resonance involvement in electron circular dichroism.