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Katedra Fizyki Atomowej, Molekularnej i Optycznej

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wszystkich: 218

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Katalog Publikacji

Rok 2018
  • Electron-impact dissociation of molecular hydrogen: benchmark cross sections
    Publikacja
    • D. Fursa
    • L. Scarlett
    • J. Tapley
    • J. Savage
    • M. Zammit
    • M. Zawadzki
    • R. Wright
    • G. Dolmat
    • M. Martin
    • L. Hargreaves
    • M. Khakoo

    - Rok 2018

    We present a joint experimental and theoretical investigation of a fundamental process in atomic and molecular physics: electron impact excitation of molecular hydrogen’s (H2) most dominant transition (X1Σg+ → b3Σu+). Excitation of this state is by far the main channel that causes the dissociation of H2 into H + H atoms at low energies. The Convergent Close-Coupling (CCC) calculations predicted significant, more than factor of...

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  • Electron-impact ionization cross section of formic acid
    Publikacja

    Experimental electron-impact ionization cross sections of one of the simplest carboxylic acids, formic acid, are presented. The molecular target was studied in two independent experimental setups applying different methods: the total ion collection and the electron–impact mass spectrometry methods. Experimental data were taken at incident electron energies ranging from ionization threshold [11.31 eV; J.C. Traeger, Int. J. Mass...

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  • Entropy Production Associated with Aggregation into Granules in a Subdiffusive Environment
    Publikacja
    • P. Weber
    • P. Bełdowski
    • M. Bier
    • A. Gadomski

    - ENTROPY - Rok 2018

    We study the entropy production that is associated with the growing or shrinking of a small granule in, for instance, a colloidal suspension or in an aggregating polymer chain. A granule will fluctuate in size when the energy of binding is comparable to k_{B}T, which is the “quantum” of Brownian energy. Especially for polymers, the conformational energy landscape is often rough and has been commonly modeled as being self-similar...

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  • Fractional Calculus Evaluation of Hyaluronic Acid Crosslinking in a Nanoscopic Part of Articular Cartilage Model System
    Publikacja
    • P. Bełdowski
    • P. Weber
    • T. De Leon
    • W. K. Auge
    • A. Gadomski

    - Rok 2018

    This work presents a study of the mechanism of physical crosslinking of hyaluronic acid in the presence of common phospholipids in synovial joint organ systems. Molecular dynamic simulations have been executed to understand the formation of hyaluronan networks at various phospholipid concentrations. The results of the simulations suggest that the mechanisms exhibit subdiffusion characteristics. Transportation quantities derive...

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  • From unextendible product bases to genuinely entangled subspaces
    Publikacja

    - PHYSICAL REVIEW A - Rok 2018

    Unextendible product bases (UPBs) are interesting mathematical objects arising in composite Hilbert spaces that have found various applications in quantum information theory, for instance in a construction of bound entangled states or Bell inequalities without quantum violation. They are closely related to another important notion, completely entangled subspaces (CESs), which are those that do not contain any fully separable pure...

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  • Hyaluronan-Chondroitin Sulfate Anomalous Crosslinking Due to Temperature Changes
    Publikacja
    • T. Andrysiak
    • P. Bełdowski
    • J. Siódmiak
    • P. Weber
    • D. Ledziński

    - Polymers - Rok 2018

    Glycosaminoglycans are a wide class of biopolymers showing great lubricating properties due to their structure and high affinity to water. Two of them, hyaluronic acid and chondroitin sulfate, play an important role in articular cartilage lubrication. In this work, we present results of the all-atom molecular dynamics simulations of both molecules placed in water-based solution. To mimic changes of the physiological conditions,...

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  • Influence of the Spectral Quality of Light on Daytime Alertness Levels in Humans
    Publikacja
    • K. Łaszewska
    • A. Goroncy
    • P. Weber
    • T. Pracki
    • M. Tafil-klawe

    - Advances in Cognitive Psychology - Rok 2018

    Exposure to light is very important for human health. However, the characteristics of the light stimulus and the appropriate timing of such exposure are essential. Studies that have used monochromatic light exposure have shown no systematic patterns for the effects of blue light compared to longer wavelengths. Previous studies have shown that red light exposure increases objective and subjective measures of alertness at night without...

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  • Investigations of the optical activity of nonlinear crystals by means of dual-wavelength polarimeter
    Publikacja

    - OPTICAL ENGINEERING - Rok 2018

    A dual-wavelength method in high accuracy polarimetry has been successfully tested and applied to measure optical activity (OA) of nonlinear crystals. In proposed polarimetric scheme two neighboring semiconductor laser wavelengths (635 and 650 nm) are used, which increases number of parameters measured simultaneously and improves the data processing. By neglecting dispersion of eigen wave ellipticity in crystals, more efficient...

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  • Low energy differential elastic electron scattering from acetonitrile (CH3CN)
    Publikacja

    - JOURNAL OF CHEMICAL PHYSICS - Rok 2018

    Measurements of elastic differential cross sections for electron scattering from acetonitrile (CH3CN) have been performed utilizing a crossed electron-molecular beam experiment and with the relative flow method, for the incident electron energy range of 0.7 eV–30 eV and the scattering angle range of 10◦–130◦. These differential cross sections have been used to calculate the elastic integral and momentum- transfer cross sections,...

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  • Low-energy electron scattering from molecular hydrogen: Excitation of the X1Σg+ to b3Σu+ transition
    Publikacja
    • M. Zawadzki
    • R. Wright
    • G. Dolmat
    • M. Martin
    • B. Diaz
    • L. Hargreaves
    • D. Coleman
    • D. Fursa
    • M. Zammit
    • L. Scarlett... i 4 innych

    - PHYSICAL REVIEW A - Rok 2018

    We present time-of-flight differential cross-section measurements and convergent close-coupling calculations of differential cross sections for the electron-impact excitation of the X 1 g + → b 3 u + transition in molecular hydrogen. A part of this work was recently published [M. Zawadzki et al., Phys. Rev. A 97, 050702(R) (2018)]. In this work, agreement between theory and experiment is excellent overall, and marks a transition...

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  • Nuclear magnetic shielding constants of Dirac one-electron atoms in some low-lying discrete energy eigenstates

    We present tabulated data for the nuclear magnetic shielding constants (σ) of the Dirac one-electron atoms with a pointlike, motionless and spinless nucleus of charge Ze. Utilizing the exact general analytical formula for σ derived by us (Stefańska, 2016) valid for an arbitrary discrete energy eigenstate, we have computed the numerical values of the magnetic shielding factors for the ground state and for the first and the second...

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  • Physical crosslinking of hyaluronic acid in the presence of phospholipids in an aqueous nano-environment
    Publikacja
    • P. Bełdowski
    • P. Weber
    • A. Dedinaite
    • P. Claesson
    • A. Gadomski

    - SOFT MATTER - Rok 2018

    Hyaluronic acid and phospholipids are two components in the synovial joint cavity that contribute to joint lubrication synergistically. Molecular dynamics simulations were performed and hydrogen bonds in hyaluronic acid were analyzed to identify specific sites that are responsible for its physical cross-linking. Two molecular masses of hyaluronic acid, 10 kDa and 160 kDa, were considered. We use molecular dynamics simulations and...

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  • Resonances and Dissociative Electron Attachment in HNCO
    Publikacja
    • M. Zawadzki
    • M. Čížek
    • K. Houfek
    • R. Čurík
    • M. Ferus
    • S. Civiš
    • J. Kočišek
    • J. Fedor

    - PHYSICAL REVIEW LETTERS - Rok 2018

    In a combined experimental and theoretical study, we probe the dissociative electron attachment in isocyanic acid HNCO. The experimental absolute cross section for the NCO− fragment shows a sharp onset and fine structures near the threshold. The autoionizing state responsible for the dissociative attachment is found in both the R-matrix calculation and using analytic continuation in the coupling constant. The involved A' resonance...

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  • Second-order Stark effect and polarizability of a relativistic two-dimensional hydrogenlike atom in the ground state
    Publikacja

    The second-order Stark effect for a planar Dirac one-electron atom in the ground state is analyzed within the framework of the Rayleigh-Schrödinger perturbation theory, with the use of the Sturmian series expansion of the generalized Dirac-Coulomb Green's function. A closed-form analytical expression for the static dipole polarizability of that system is found. The formula involves the generalized hypergeometric function ${}_{3}F_{2}$...

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  • Static magnetic multipole susceptibilities of the relativistic hydrogenlike atom in the ground state: Application of the Sturmian expansion of the generalized Dirac-Coulomb Green function
    Publikacja

    We study far- and near-field magnetic and electric multipole moments induced in the ground state of the Dirac one-electron atom placed in a weak 2L-pole magnetostatic field. The analysis is carried out within the framework of the first-order Rayleigh-Schrödinger perturbation theory, with the use of the Sturmian expansion of the generalized Dirac-Coulomb Green function [Szmytkowski, J. Phys. B 30, 825 (1997);J. Phys. B 30, 2747(E)...

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  • The Dynamical Projectors Method Hydro and Electrodynamics
    Publikacja

    - Rok 2018

    The dynamical projectors method proves to reduce a multicomponent problem to the simplest one-component problem with its solution determined by specific initial or boundary conditions. Its universality and application in many different physical problems make it particularly useful in hydrodynamics, electrodynamics, plasma physics, and boundary layer problems. A great variety of underlying mechanisms are included making this book...

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  • Time-of-flight electron scattering from molecular hydrogen: Benchmark cross sections for excitation of the X1Σ+g→b3Σ+u transition
    Publikacja
    • M. Zawadzki
    • R. Wright
    • G. Dolmat
    • M. Martin
    • L. Hargreaves
    • D. Fursa
    • M. Zammit
    • L. Scarlett
    • J. Tapley
    • J. Savage... i 2 innych

    - PHYSICAL REVIEW A - Rok 2018

    The electron impact X1Σ+g to b3Σ+u transition in molecular hydrogen is one of the most important dissociation pathways to forming atomic hydrogen atoms, and is of great importance in modeling astrophysical and industrial plasmas where molecular hydrogen is a substantial constituent. Recently it has been found that the convergent close-coupling (CCC) cross sections of Zammit et al. [Phys. Rev. A 95, 022708 (2017)] are up to a factor...

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  • Two-dimensional hydrogen-like atom in a weak magnetic field

    We consider a non-relativistic two-dimensional (2D) hydrogen-like atom in a weak, static, uniform magnetic field perpendicular to the atomic plane. Within the framework of the Rayleigh-Schr¨odinger perturbation theory, using the Sturmian expansion of the generalized radial Coulomb Green function, we derive explicit analytical expressions for corrections to an arbitrary planar hydrogenic bound-state energy level, up to the fourth...

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Rok 2017
Rok 2016
Rok 2015
Rok 2014