Mateusz Zawadzki - Publications - Bridge of Knowledge

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dr hab. Mateusz Zawadzki

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Year 2023
  • TIME-OF-FLIGHT DIFFERENTIAL ELECTRON SCATTERING FROM MOLECULAR TARGETS: BENCHMARK CROSS SECTIONS
    Publication

    - Year 2023

    We report time-of-flight differential cross section (DCS) measurements for the electron impact excitation transition in H2. In this work, agreement between available theory and experiment is excellent overall, and marks a transition in electron molecule scattering where differential scattering of excitation is found to be in such precise agreement. We also prove that the newly built apparatus can be used for accurate measurement...

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Year 2022
Year 2020
  • Carboxylation Enhances Fragmentation of Furan upon Resonant Electron Attachment
    Publication

    - JOURNAL OF PHYSICAL CHEMISTRY A - Year 2020

    We report a dissociative electron attachment study to 2-furoic acid (C5H4O3) isolated in a gas phase, which is a model molecule consisting of a carboxylic group and a furan ring. Dissociation of furan by low energy electrons is accessible only via electronic excited Feshbach resonances at energies of incident electrons above 5 eV. On the other hand, carboxylic acids are well- known to dissociate via attachment of electrons at subexcitation energies....

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  • Dissociation of furan-2-carboxylic acid by low energy electrons
    Publication

    - Journal of Physics : Conference Series - Year 2020

    Electron attachment to molecular target can lead to a variety of negative fragment ions. We experi- mentally probe the main dissociative electron attachment channels in furan-2-carboxylic acid (C3H3O2 − COOH) - a molecular target composed of two important structural units: a furan ring and a carboxylic group. In our studies we utilise nearly mono-energetic electrons at electron energies from 0 eV up to 15 eV. Our detection setup...

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  • Dissociative electron attachment to benzoic acid (C7H6O2)
    Publication

    - JOURNAL OF CHEMICAL PHYSICS - Year 2020

    The dissociative electron attachment (DEA) to benzoic acid (C6H5COOH) has been studied using an experimental crossed beam setup of a quadrupole mass spectrometer and a trochoidal electron monochromator. Relative partial cross sections for the DEA to produce negative ion fragments show the main channels for dissociation. The comparison of the present results with the ultraviolet photoelectron spectrum of benzoic acid [J. Meeks,...

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  • Interaction of 4-nitrothiophenol with low energy electrons: Implications for plasmon mediated reactions
    Publication
    • R. Schürmann
    • T. F. M. Luxford
    • I. S. Vinklárek
    • J. Kočišek
    • M. Zawadzki
    • I. Bald

    - JOURNAL OF CHEMICAL PHYSICS - Year 2020

    The reduction of 4-nitrothiophenol (NTP) to 4-4′-dimercaptoazobenzene (DMAB) on laser illuminated noble metal nanoparticles is one of the most widely studied plasmon mediated reactions. The reaction is most likely triggered by a transfer of low energy electrons from the nanoparticle to the adsorbed molecules. Besides the formation of DMAB, dissociative side reactions of NTP have also been observed. Here, we present a crossed electron-molecular...

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  • Low energy differential elastic electron scattering from trichloromethane
    Publication

    - Journal of Physics : Conference Series - Year 2020

    Experimental differential cross sections for low energy electron scattering from trichloromethane is measured utilizing a crossed electron-molecular beam experiment via the relative flow method, for the incident electron energies in the range of E = 0.5 eV-30 eV and the scattering angles in the range of θ = 10◦ − 130◦ .

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  • Low energy elastic electron scattering from benzonitrile (C6H5CN)
    Publication

    - Journal of Physics : Conference Series - Year 2020

    We present experimental differential elastic scattering cross sections (DCSs) for low energy electron scattering from benzonitrile along with integral and momentum-transfer cross sections that are determined from these DCSs. The measurements of DCSs are obtained using the relative flow method with helium as the standard gas, in a crossed electron-molecular gas beam arrangement. Our measurements are made at incident electron energies...

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  • Low energy electron mass stopping power in H2
    Publication

    We present experimental mass stopping powers of electrons in gaseous H2 obtained with a newly developed electron time-of-flight spectrometer, for the incident electron energy range of 10eV to 25eV. In our procedure the average energy loss is derived from our conversion of measured electron time-of-flight spectra into equivalent electron energy loss spectra so as to obtain the values of mass stopping power for electron scattering...

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  • Low energy inelastic electron scattering from carbon monoxide: I. excitation of the a3Π, a’3Σ+ and AΠ1 electronic states.
    Publication
    • M. Zawadzki
    • M. Khakoo
    • L. Voorneman
    • L. Ratkovic
    • Z. Masin
    • K. Houfek
    • A. Dora
    • R. Laher
    • J. Tennyson

    - JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS - Year 2020

    Differential 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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  • Theoretical and experimental study on scattering of low-energy electrons by dimethyl and diethyl ethers
    Publication
    • G. Tatreau
    • B. Hlousek
    • M. Zawadzki
    • M. Khakoo
    • F. P. Bardela
    • A. S. Barbosa
    • M. H. F. Bettega

    - JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS - Year 2020

    We report a joint theoretical and experimental investigation on low-energy electron scattering by dimethyl and diethyl ethers. The experimental elastic differential cross sections were measured at impact energies from 1 eV up to 30 eV and scattering angle range of 10◦ to 130◦. Theoretical elastic differential, integral and momentum-transfer cross sections are calculated at impact energies up to 30 eV, employing the Schwinger multichannel...

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Year 2019
  • Dissociative ionization dynamics of dielectric gas C3F7CN
    Publication
    • M. Ranković
    • J. Chalabala
    • M. Zawadzki
    • J. Kočišek
    • P. Slavíček
    • J. Fedor

    - PHYSICAL CHEMISTRY CHEMICAL PHYSICS - Year 2019

    Fluoronitrile C3F7CN is a promising candidate for the replacement of SF6 dielectric gas in high-voltage insulation. We present a combined experimental and theoretical study on its ionization dynamics probed in the 0-100 eV energy range. We exploited the total ion collection technique to determine the absolute ionization cross section, mass spectrometry to determine the fragment branching ratios and ab initio nonadiabatic molecular...

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  • Elastic scattering of electrons from chloroform
    Publication
    • B. Hlousek
    • M. F. Martin
    • M. Khakoo
    • M. Zawadzki
    • G. M. Moreira
    • L. S. Maioli
    • M. Bettega
    • L. Machado
    • V. A. S. d. Mata
    • A. J. da Silva... and 3 others

    - PHYSICAL REVIEW A - Year 2019

    We present experimental and theoretical cross sections for elastic electron scattering from CHCl3. This is an important target because of its relevance to environmental chemistry and the plasma etching industry as a source of chlorine radicals. The experimental results were obtained at incident electron energies ranging from 0.5 to 800 eV in the 10deg-130deg scattering angle range. Theoretically, the scattering cross sections in...

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  • Experimental determination of H2 mass stopping powers for low-energy electrons
    Publication

    - PHYSICAL REVIEW A - Year 2019

    We present experimental mass stopping powers of electrons in gaseous H2 obtained with an electron time- of-flight spectrometer, for the incident electron energy range of 11 to 25 eV. In our procedure, the average energy loss is derived from conversion of the measured electron time-of-flight spectra into equivalent electron energy-loss spectra. Our present results are compared with the only available experimental measurement and...

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  • Low energy elastic scattering of electrons from hexafluoropropene (C3F6)
    Publication
    • A. Sakaamini
    • S. Khakoo
    • B. Hlousek
    • M. Khakoo
    • M. Zawadzki
    • M. Kiataki
    • M. Bettega

    - JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS - Year 2019

    We present cross sections from a joint experimental and theoretical study on elastic electron scattering from hexafluoropropene (C3F6) in the gas phase. The experimental results, using low energy electron spectroscopy, were obtained at incident electron energies of 0.5, 1, 1.5, 2, 3, 4, 5, 6, 10, 12, 15 and 20 eV, for scattering angles ranging from 10°to 130°. The theoretical method used in the computation of the integral, momentum...

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  • Low to intermediate energy elastic electron scattering from dichloromethane (CH2Cl2)
    Publication
    • B. Hlousek
    • M. Martin
    • M. Zawadzki
    • M. Khakoo
    • L. Machado
    • R. Lucchese
    • V. A. S. da Mata
    • I. Iga
    • M. Lee
    • M. Homem

    - JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS - Year 2019

    We report a theoretical-experimental investigation of electron scattering by dichloromethane (CH2Cl2) in the low- and intermediate energy ranges. Experimental elastic differential cross sections (DCS), in the incident electron energy range of 0.5-800 eV and scattering angle range of 10°–130°, were measured using a crossed beam relative flow technique. Integral and momentum- transfer cross sections were determined from the experimental...

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  • Ultrazimne atomy od kuchni
    Publication

    Artykuł prezentuje w jaki sposób osiągnąć temperaturę bliską 0 K w laboratorium fizycznym. Krok po kroku opisane zostały procedury eksperymentalne używane do wytwarzania atomowego kondensatu Bose-Einsteina, m.in. chłodzenie laserowe, pułapkowanie magnetyczne, chłodzenie przez odparowanie.

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Year 2018
  • Dissociative electron attachment and anion-induced dimerization in pyruvic acid
    Publication

    - PHYSICAL CHEMISTRY CHEMICAL PHYSICS - Year 2018

    We report partial cross sections for the dissociative electron attachment to pyruvic acid. A rich fragmentation dynamics is observed. Electronic structure calculations facilitate the identification of complex rearrangement reactions that occur during the dissociation. Furthermore, a number of fragment anions produced at electron energies close to 0 eV are observed, that cannot originate from single electron-molecule collisions....

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  • Electron attachment to hexafluoropropylene oxide (HFPO)
    Publication
    • M. Zawadzki
    • A. Chachereau
    • J. Kočišek
    • C. Franck
    • J. Fedor

    - JOURNAL OF CHEMICAL PHYSICS - Year 2018

    We probe the electron attachment in hexafluoropropylene oxide (HFPO), C3F6O, a gas widely used in plasma technologies. We determine the absolute electron attachment cross section using two completely different experimental approaches: (i) a crossed-beam experiment at single collision conditions (local pressures of 5 × 10−4 mbar) and (ii) a pulsed Townsend experiment at pressures of 20–100 mbar. In the latter method, the cross sections...

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  • Electron collisions with cyanoacetylene HC3N : Vibrational excitation and dissociative electron attachment
    Publication
    • M. Ranković
    • P. Nag
    • M. Zawadzki
    • L. Ballauf
    • J. Žabka
    • M. Polášek
    • J. Kočišek
    • J. Fedor

    - PHYSICAL REVIEW A - Year 2018

    We experimentally probe electron collisions with HC3N in the energy range from 0 to 10 eV with the focus on vibrational excitation and dissociative electron attachment. The vibrational excitation cross sections show a number of resonances which are mode specific: the two dominant π∗ resonances are visible in the excitation of all the vibrational modes; however, broad σ ∗ resonances are visible only in certain bond-stretching vibrational...

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  • Electron interactions with Bis(pentamethylcyclopentadienyl) titanium(IV) dichloride and difluoride
    Publication
    • J. Langer
    • M. Zawadzki
    • M. Fárník
    • J. Pinkas
    • J. Fedor
    • K. Jaroslav

    - EUROPEAN PHYSICAL JOURNAL D - Year 2018

    We present a combined experimental and theoretical study of the interaction of electrons with Bis(pentamethylcyclopentadienyl)titanium(IV) dichloride (Cp∗2TiCl2) and difluoride (Cp∗2TiF2). We report the experimental measurements of partial cross sections for the dissociative electron attachment (DEA) and the electron ionization (EI) mass spectra of isolated molecules. Estimates of the absolute cross sections are done on the basis...

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

    - Year 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
    Publication

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

    - JOURNAL OF CHEMICAL PHYSICS - Year 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
    Publication
    • M. Zawadzki
    • R. Wright
    • G. Dolmat
    • M. Martin
    • B. Diaz
    • L. Hargreaves
    • D. Coleman
    • D. Fursa
    • M. Zammit
    • L. Scarlett... and 4 others

    - PHYSICAL REVIEW A - Year 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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  • Resonances and Dissociative Electron Attachment in HNCO
    Publication
    • M. Zawadzki
    • M. Čížek
    • K. Houfek
    • R. Čurík
    • M. Ferus
    • S. Civiš
    • J. Kočišek
    • J. Fedor

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

    - PHYSICAL REVIEW A - Year 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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Year 2017
  • Dissociation of 2-oxopropanoic acid by low energy electrons
    Publication

    - Journal of Physics : Conference Series - Year 2017

    Electron attachment to molecular target can lead to a variety of negative fragment ions. We experimentally probe the main dissociative electron attachment (DEA) channels in 2-oxopropanoic acid (CH3 - CO - COOH) - an important trace component in the Earth's atmosphere. In our studies we utilise nearly mono-energetic electrons at electron energies from 0 eV up to 15 eV.

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  • ELECTRON ATTACHMENT TO HETEROGENEOUS MOLECULAR CLUSTERS
    Publication
    • J. Kočišek
    • J. Lengyel
    • K. Grygoryeva
    • A. Pysanenko
    • M. Zawadzki
    • J. Fedor
    • M. Fárník

    - Year 2017

    Heterogeneous clusters are unique model species enabling studies of bulk and surface processes by vacuum restricted methods. This is of particular importance for the reactions of low-energy electrons which have extremely short penetration depth in bulk environments. This contribution overviews our recent experiments with low-energy electrons and clusters prepared by different techniques. First, the deposition of molecules on argon...

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  • SKY PG - kolejny sukces na Wydziale Fizyki Technicznej i Matematyki Stosowanej
    Publication

    - Pismo PG - Year 2017

    Sukcesem zakończyła się misja balonu meteorologicznego z sondą pomiarową przygotowaną przez studentów Wydziału Fizyki Technicznej i Matematyki Stosowanej. W lipcu 2016 roku grupa studentów z WFTiMS, we współpracy z Kołem Naukowym Studentów Fizyki PG, wykonała pomiary wybranych wielkości zycznych, posługując się autorskim układem pomiarowym, umieszczonym w sondzie badawczej przyczepionej do balonu meteorologicznego. Podczas około...

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  • Total cross section for low-energy electron scattering from formic acid, (HCOOH), molecules

    Total cross section (TCS) for low-energy electron scattering from formic acid molecules has been measured using electrostatic electron spectrometer working in linear transmission mode. Two local maxima centered around 1.7 eV and 7.8 eV have been observed and associated with resonant scattering processes.

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