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Search results for: electron-hole pairs
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Electron Scattering on X(CH3)4 Molecules: Applicability of Simple Additivity Rule and Role of Methylation
PublicationTo investigate influence of target methylation (substitution of a hydrogen atom by methyl group) on electron-collision processes we compare absolute total cross sections for XH4 and X(CH3)4 molecules, where X is Si and Ge, respectively. We also compare experimental TCSs energy dependencies with estimated data obtained using simple formula and TCSs for methyl group and those for SiH4 and GeH4. Electron-scattering TCSs for mentioned...
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Electric field effect on luminescence, and photoconduction in electron donor - electron acceptor organic solid films
PublicationZaobserwowano silne wygaszenie fotoluminescencji (80%) i duże fotoprądy (1mA/cm2) w układzie dendrymer aminowy m-MTDATA (donor elektronu) : pochodna fenantroliny BPT (akceptor elektronu) niedomieszkowanym oraz zawierającym domieszkę w postaci organicznego kompleksu platyny PtL2Cl. W interpretacji wyników uwzględniono elektrycznopolową dysocjację singletowych ekscypleksów m-MTDATA:BPT i trypletowych ekscypleksów m-MTDATA : PtL2Cl...
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Analysis of metals in air particles from Gdańsk and London with EDX/EDS detectors in electron microscope
PublicationElectron microscopy with energy dispersive X-ray spectrometry (EDX/EDS) is the example of non-destructive analytical method for surface elemental analysis, with a potential detection limit of 0.1-0.5 wt.% for most elements. A spatial resolution <10 nm can be achieved using this technique, which provides a basis for the generation of quantitative and qualitative elemental data for individual particles. In order to obtain quantitative...
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Experimental investigation on the effect of dry and multi-jet cryogenic cooling on the machinability and hole accuracy of CFRP composites
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Electromodulation of fluorescence in hole-transporting materials for organic light-emitting diodes. Part II: Straburst amines
PublicationPraca jest kontynuacją artykułu, który został opublikowany wChem. Phys. vol. 256 (2000) s. 351-362. Zaobserwowano silne wygaszenie fluorescencji w dendrymerach aminowych zbudowanych na bazie trifenyloaminy. Efekt ten został przypisany rozpadowi stanów emitujących światło pod działaniem silnego pola elektrycznego.
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Scanning Electron Microscopy images of nanocubes suspension 1 month after synthesis
Open Research DataThis dataset contains the SEM images of the gold nanocubes suspension in citrate buffer. The goal of the study was to evaluate the size of the synthesized nanocubes, their stability one month after the synthesis process, and to verify the optimal conditions regarding nanocubes concentration for the SEM analysis. Solutions with two different AuNC concentrations...
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Diphosphinoboranes as Intramolecular Frustrated Lewis Pairs: P–B–P Bond Systems for the Activation of Dihydrogen, Carbon Dioxide, and Phenyl Isocyanate
PublicationHerein, we present the first example of the activation of small molecules by P-B-P bond systems. The reactivity study involves reactions of two selected diphosphinoboranes, (tBu2P)2BPh (1’) and (Cy2P)2BNiPr2 (2), that differ in terms of their structural and electronic properties for the activation of dihydrogen, carbon dioxide, and phenyl isocyanate. Diphosphinoborane 1’ activates H2 under very mild conditions in the absence of...
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Electron-impact ionization of fluoromethanes – Review of experiments and binary-encounter models
PublicationExperiments and recommended data on electron-impact ionization of methane and fluoromethanes (CH3F, CH2F2, CHF3, CF4) are reviewed and compared with binary-encounter models (Gryzinski’s, ´ Deutsch and Märk’s, and Kim and Rudd’s). A good agreement between recent experiments and the two latter classical-like models is shown. Kim and Rudd’s model (calculated presently in the restricted HartreeFock 6-31**G orbital basis) predicts well...
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The Progress in Electron Microscopy Studies of Particulate Matters to Be Used as a Standard Monitoring Method for Air Dust Pollution
PublicationThe present article reviews studies on air solid particles carried out with the use of electron microscopy. Particle analysis combining scanning and transmission electron microscopy (SEM and TEM) can be used to derive size-resolved information of the composition, mixing state, morphology, and complex refractive index of atmospheric aerosol particles. It seems that electron microscopy is more widely used in atmospheric particulate...
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Scanning electron microscopy (SEM) images of the boron-dopied diamond surfaces
Open Research DataThe dataset contains the scanning electron micrographs (SEM), revealing the surface morphology of diamond electrodes on different substrates. The diamond surface is characterized by an aggregation of crystals that do not form a continuous layer.
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Scanning electron microscopy (SEM) images of the boron-dopied diamond surfaces
Open Research DataThe dataset contains the scanning electron micrographs (SEM), revealing the surface morphology of diamond electrodes on silicon substrates. The diamond surface is characterized by ultra-crystalline diamonds obtained by CVD synthesis.
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Unveiling the electron-induced ionization cross sections and fragmentation mechanisms of 3,4-dihydro-2H-pyran
PublicationThe interactions of electrons with molecular systems under various conditions are essential to interdisciplinary research fields extending over the fundamental and applied sciences. In particular, investigating electron-induced ionization and dissociation of molecules may shed light on the radiation damage to living cells, the physicochemical processes in interstellar environments, and reaction mechanisms occurring in combustion...
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Hopping or Tunneling? Tailoring the Electron Transport Mechanisms through Hydrogen Bonding Geometry in the Boron-Doped Diamond Molecular Junctions
PublicationMechanisms of charge transport in molecular junctions involving hydrogen bonds are complex and remain mostly unclear. This study is focused on the elucidation of the electron transfer in a molecular device consisting of two boron-doped diamond interfaces bound with an aromatic linker and a hydrogen bonding surrogating molecule. The projected local density of states (PLODS) analysis coupled with transmission spectra and current−voltage...
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Effect of Electron Beam Power Density on the Structure of Titanium Under Non-Vacuum Electron-Beam Treatment
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Effects of different external carbon sources and electron acceptors on interactions between denitrification and phosphorus removal in BNR processes
PublicationThe effects of two different external carbon sources (acetate, ethanol) and electron acceptors (dissolved oxygen, nitrate and nitrite) were investigated under aerobic and anoxic conditions with non-acclimated process biomass from a full-scale biological nutrient removal activated sludge system. When acetate was added as an external carbon source, phosphate release was observed even in the presence of electron acceptors. The release...
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POLFEL - Free Electron Laser in Poland
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Electron collisions with ethylene oxide molecules
PublicationZmierzono całkowite przekroje czynne na rozproszenie elektronów na drobinach tlenku etylenu w zakresie energii od 0.7 do 400 eV. Obliczono przekroje czynne na zderzenia sprężyste oraz przekroje czynne na jonizację. Otrzymane wyniki obliczeń są zgodne z wynikami eksperymentalnymi w pokrywającym się przedziale energii zderzenia. Wyniki uzyskane dla tlenku etylenu porównano z przekrojami czynnymi dla jego izoelektronowego odpowiednika...
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Measurements of electron drift velocity in OCS
PublicationWykonano pomiary prędkości dryfu elektronów w funkcji zredukowanego pola elektrycznego E/N. Wyniki tych pomiarów porównano z wynikami pomiarów w CO2 i N2O.
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Amino acid formation by electron irradiation
PublicationW artykule zaprezentowano procedurę badania reakcji indukowanych przez niskoenergetyczne elektrony w mieszanych warstwach molekularnych CH3COOD:NH3.
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Relativistic electron beams above thunderclouds
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Electron Transport in Naphthalene Diimide Derivatives
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Measurements of electron scattering in the backward direction
PublicationPrzedstawiono wyniki badań rozproszenia elektronów na atomach i cząsteczkach przeprowadzonych w zakresie dużych kątów rozproszenia do 180o.
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Electron Elastic Collisions with C3F6 Molecule
PublicationObliczono różniczkowy i scałkowany przekrój czynny na zderzenia elektronu z molekułą C3F6 w zakresie średnich i wysokich energii (50-1000eV). Obliczenia wykonano stosując metodę atomów niezależnych. Stwierdzono dobrą zgodność z wynikami oszacowanymi na podstawie eksperymentu.
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Computational studies of a hypocycloidal electron monochromator
PublicationPrzeprowadzono badania hipocykolidalnego monochromatora elektronów, wykorzystując komputerowy program optyki elektronowej CPO-3D. Obliczono i przeprowadzono analizę torów elektronów w wiązce o zadanym rozmyciu kątowym przechodzącej przez monochromator. Ustalono, że rozdzielczość energetyczna monochromatora jest wyższa niż odpowiadającego mu monochromatora trochoidalnego.
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Calculation of electron scattering lengths on Ar, Kr, Xe, Rn and Og atoms
PublicationFocusing on the noble gases, we calculate the scattering potential using the Dirac-Coulomb Hamiltonian supplemented with a model polarization potential. We determine the scattering lengths using two methods, namely phase shifts for very small scattering energies and the shape of the wave function for zero scattering energy. We compare our theoretical electron scattering length results on Ar, Kr and Xe atoms with existing experimental...
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Low energy inelastic electron scattering from carbon monoxide: I. excitation of the a3Π, a’3Σ+ and AΠ1 electronic states.
PublicationDifferential scattering cross sections for electron excitation of the three lowest excited electron states of carbon monoxide are obtained experimentally using low-energy electron energy-loss spectroscopy and theoretically using the R-matrix method. The incident electron energies range from near-threshold of 6.3 eV to 20 eV. Experimental scattering angles range from 20◦ to 120◦. The normalization of the experimental cross sections...
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Nonlocal nonlinear bending of rectangular nanoscale plate including central hole via complex differential quadrature method
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Role of methylation in electron scattering on X(CH3)4 (X = C, Si, Ge) molecules
PublicationTotal cross sections (TCS) for low-energy electron scattering from X(CH3)4 (where X = C, Si, Ge) molecules have been measured using linear transmission method. Present results and those obtained previously for XH4 molecules were used to determine how methylation of the target is reflected in TCS energy dependence.
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Potential Skyrmion Host Fe(IO3)3: Connecting Stereoactive Lone-Pair Electron Effects to the Dzyaloshinskii-Moriya Interaction
PublicationMagnetic skyrmions, which are topologically distinct magnetic spin textures, are gaining increased attention for their unique physical properties and potential applications in spintronic devices. Here we present a design strategy for skyrmion host candidates based on combinations of magnetic spin, asymmetric building units having stereoactive lone-pair electrons, and polar lattice symmetry. To demonstrate the viability of the proposed...
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Opposite pressure impact on electron-phonon coupling in Eu2+ and Ce3+ doped AlN
Open Research DataThis data analyzes the influence of pressure on electron–lattice interactions in the 5d excited states of Ce3+ and Eu2+ in the AlN host based on pressure-dependent photoluminescence and photoluminescence excitation spectra. High-pressure measurements on AlN samples doped with Eu2+ and Ce3+ ions reveal that the Stokes shift increases with pressure for...
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Role of methylation in electron scattering on X(CH3)4 (X= C, Si, Ge) molecules (2)
PublicationTo investigate how replacement of H atom with methyl group (CH3) – in tetrahedral compounds of carbon, silicon and germanium – affects electron scattering process, total cross sections (TCS) for electron scattering from C(CH3)4, Si(CH3)4 and Ge(CH3)4 molecules have been compared with data for CH4, SiH4 and GeH4 molecules. All examined data have been obtained with the same experimental setup. The shape of all discussed TCS energy...
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Electron-Induced Decomposition of Uracil-5-yl O-(N,N-dimethylsulfamate): Role of Methylation in Molecular Stability
PublicationThe incorporation of modified uracil derivatives into DNA leads to the formation of radical species that induce DNA damage. Molecules of this class have been suggested as radiosensitizers and are still under investigation. In this study, we present the results of dissociative electron attachment to uracil-5-yl O-(N,N-dimethylsulfamate) in the gas phase. We observed the formation of 10 fragment anions in the studied range of electron...
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Modeling N2O behavior during denitrification with different carbon sources and electron acceptors
PublicationA mathematical model was developed for identification of the most important mechanism leading to nitrous oxide (N2O) accumulation in denitrifying activated sludge systems. The activated sludge model No. 2d (ASM2d) was extended to include intermediate three steps of the denitrification process. The formation and accumulation of nitric oxide (NO) was assumed to be very low in the performed laboratory experiments. These experiments...
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Ultrastructural analysis of the submandibular sialoliths: Raman spectroscopy and electron back-scatter studies
PublicationThe aim of work was the epidemiological analysis of the occurrence of sialolithiasis of the submandibular gland in adults and the evaluation of the ultrastructure of salivary stones. The study sample consisted of 44 sialoliths. Analysis of the structure and chemical composition of sialoliths was performed using a Scanning Electron Microscope and Raman Spectroscopy. Comparing our results with the literature we can say that the epidemiology...
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APPLICATION OF BINARY-ENCOUNTER-BETHE METHOD TO ELECTRON-IMPACT IONIZATION CROSS SECTION CALCULATIONS FOR BIOLOGICALLY RELEVANT MOLECULES
PublicationElectron-impact cross sections for platinum chemotherapeutic compounds, purine and pyrimidine molecules calculated using binary-encounterBethe model are presented as examples of possible applications of that method.
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Scanning electron microscopy (SEM) images of the boron-doped carbon nanowalls surfaces
Open Research DataThe dataset contains the scanning electron micrographs (SEM), revealing the surface morphology of boron-doped carbon nanowalls electrodes on silicon substrates. The surface is characterized by nano-walled structures. The obtained electrodes were doped with boron at the level of [B]/[C] = 5000ppm in the gas atmosphere during the synthesis.
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Scanning electron microscopy (SEM) images of the boron-dopied carbon nanowalls surfaces
Open Research DataThe dataset contains the scanning electron micrographs (SEM), revealing the surface morphology of boron-doped carbon nanowalls electrodes on silicon substrates. The surface is characterized by nano-walled structures. The obtained electrodes were doped with boron at the level of [B]/[C] = 1200ppm in the gas atmosphere during the synthesis.
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Scanning electron microscopy (SEM) images of the boron-doped carbon nanowalls surfaces
Open Research DataThe dataset contains the scanning electron micrographs (SEM), revealing the surface morphology of boron-doped carbon nanowalls electrodes on silicon substrates. The surface is characterized by nano-walled structures. The obtained electrodes were doped with boron at the level of [B]/[C] = 2000ppm in the gas atmosphere during the synthesis.
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Non-adiabatic coupling elements between the diatomic silver anion and neutral silver dimer plus continuum electron
Open Research DataThe process of a two-channel decay of the diatomic silver anion (Ag2-), namely the spontaneous electron ejection giving Ag2 + e- and the dissociation leading to Ag- + Ag is theoretically studied. The ground state potential energy curves (PECs) of the neutral silver dimer and anionic silver diatomic molecule are calculated using the single reference...
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The importance of anchoring ligands of binuclear sensitizers on electron transfer processes and photovoltaic action in dye-sensitized solar cells
PublicationThe relatively low photon-to-current conversion efficiency of dye-sensitized solar cells is their major drawback limiting widespread application. Light harvesting, followed by a series of electron transfer processes, is the critical step in photocurrent generation. An in-depth understanding and fine optimization of those processes are crucial to enhance cell performance. In this work, we synthesize two new bi-ruthenium sensitizers...
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Dissociative Electron Attachment to 5-Iodo-4-thio-2′-deoxyuridine: A Potential Radiosensitizer of Hypoxic Cells
PublicationIn the search for effective radiosensitizers for tumor cells, halogenated uracils have attracted more attention due to their large cross section for dissociation upon the attachment of low-energy electrons. In this study, we investigated dissociative electron attachment (DEA) to 5-iodo-4-thio-2'-deoxyuridine, a potential radiosensitizer using a crossed electron-molecule beam experiment coupled with quadrupole mass spectrometry....
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IEEE TRANSACTIONS ON ELECTRON DEVICES
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Intramolecular Proton Transfer in the Radical Anion of Cytidine Monophosphate Sheds Light on the Sensitivities of Dry vs Wet DNA to Electron Attachment-Induced Damage
PublicationSingle-strand breaks (SSBs) induced via electron attachment were previously observed in dry DNA under ultrahigh vacuum (UHV), while hydrated electrons were found not able to induce this DNA damage in an aqueous solution. To explain these findings, crossed electron-molecular beam (CEMB) and anion photoelectron spectroscopy (aPES) experiments coupled to density functional theory (DFT) modeling were used to demonstrate the fundamental...
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Electron magnetic resonance study of the Ni47Co3Mn35.5In14.5 ribbons
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Free electron laser infrastructure in Europe 2012
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Electron collision with sulfuryl chloride (SO2Cl2) molecule
PublicationStosując liniową metodę transmisyjną zmierzono całkowite przekroje czynne (TCS) na zderzenie elektronów z drobinami SO2Cl2 w zakresie energii 0.5-150 eV. Stwierdzono obecność głębokiego minimum przy ok. 1.8 eV i szerokiego maksimum w pobliżu 9.5 eV. Przeprowadzono porównanie z dostępnymi wynikami dla innych związków zawierających grupę sulfonową.
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Electron collision with B(CD3)3 molecules
PublicationArtykuł prezentuje całkowite przekroje czynne na rozpraszanie elektronów na drobinach B(CD3)3 zmierzone dla niskich i średnich energii zderzenia. Wyniki porównano z elastycznymi i jonizacyjnymi przekrojami czynnymi obliczonymi dla drobiny B(CD3)3 dla średnich energii zderzenia. Porównano i przedyskutowano przekroje czynne dla drobin zawierających bor.
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Dissociative electron attachment of furan, tetrahydrofuran, and fructose
PublicationPrzeprowadzono badania wychwytu dysocjacyjnego elektronów w cząsteczkach furanu, tetrahydrofuranu i fruktozy w przedziale energii 0-14eV. Stwierdzono, że w przypadku wychwytu elektronów o energiach poniżej progu wzbudzenia (< 3eV), jedynie fruktoza jest podatna na rozerwanie pierścienia cukrowego. W cząsteczkach furanu i tetrahydrofuranu struktury rezonansowe odpowiadające fragmentom pierścienia pojawiają się dla energii elektronów...
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Coherent electron transport in hydrocarbon molecular devices
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The Eliashberg study of the electron–phonon superconductivity inYSn3compound
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