Brygida Mielewska
Gdańsk University of Technology
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Featured researches published by Brygida Mielewska.
Journal of Chemical Physics | 2006
Philipp Sulzer; Sylwia Ptasinska; F. Zappa; Brygida Mielewska; Alexandar R. Milosavljevic; P. Scheier; T.D. Märk; Ilko Bald; Sascha Gohlke; Michael A. Huels; Eugen Illenberger
We study dissociative electron attachment to furan (FN) (C(4)H(4)O), tetrahydrofuran (THF) (C(4)H(8)O), and fructose (FRU) (C(6)H(12)O(6)) using crossed electron/molecular beams experiments with mass spectrometric detection of the anions. We find that FN and THF are weak electron scavengers and subjected to dissociative electron attachment essentially in the energy range above 5.5 eV via core excited resonances. In striking contrast to that, FRU is very sensitive towards low energy electrons generating a variety of fragment ions via a pronounced low energy feature close to 0 eV. These reactions are associated with the degradation of the ring structure and demonstrate that THF cannot be used as surrogate to model deoxyribose in DNA with respect to the attack of electrons at subexcitation energies (<3 eV). The results support the picture that in DNA the sugar moiety itself is an active part in the initial molecular processes leading to single strand breaks.
Journal of Physics B | 2011
Marcin Dampc; Ewelina Szymańska; Brygida Mielewska; Mariusz Zubek
Electron impact ionization and ionic fragmentation of tetrahydrofuran molecules in the gas phase were studied in the energy range from ionization threshold up to 150 eV using the technique of mass spectrometry. The cation mass spectra, ionization and ionic fragmentation efficiencies were measured over this energy range. Well-resolved mass peaks were detected in the mass range 10-72 amu and assigned to corresponding ionic molecular fragments. The most abundant cation in the mass spectra is at 42 amu. Appearance energies of selected ionic fragments were also determined. Possible ionic fragmentation processes are discussed.
Journal of Physics B | 1999
Mariusz Zubek; Brygida Mielewska; J. M. Channing; G C King; F H Read
Resonance structures corresponding to the 2sS state in He and the np(n + 1) s(S) states in Ne, Ar, Kr and Xe have been studied in elastic electron scattering over the angular range from 100 to 180. A newly developed magnetic angle-changing technique has been used and this has allowed the first observation of these structures at and near to 180. The widths and energies of the resonance states in krypton and xenon have been determined.
Journal of Physics B | 2000
Mariusz Zubek; Brygida Mielewska; G C King
Absolute differential cross sections for elastic electron scattering and vibrational (v = 0→1) excitation in nitrogen have been measured in the range of scattering angle from 120° to 180° at an incident electron energy of 5 eV. The measurements have been carried out using the magnetic angle-changing technique that allows observation of scattering in the backward direction. These results, together with the existing experimental data for lower scattering angles, give differential cross sections over a wide angular range from close to zero to 180°. The importance of short- and long-range correlation (polarization) interactions for elastic electron scattering at forward and backward directions is discussed.
Chemical Physics Letters | 1999
Brygida Mielewska; G C King; Frank H. Read; Mariusz Zubek
Abstract Resonance structures corresponding to the (3sσ) 2 2 Σ + state in carbon monoxide at 10.044 eV and the (3sσ g ) 2 2 Σ g + state in nitrogen at 11.499 eV have been studied in elastic electron scattering over the range of scattering angle from 95° to 180°. A new magnetic angle-changing technique has been used in the measurements, which has enabled the first observation of these resonance structures at and close to 180°. The width of the 2 Σ + resonance in carbon monoxide has been determined to be 42±3 meV.
Measurement Science and Technology | 2005
Małgorzata A. Śmiałek; A Dydycz; Brygida Mielewska; V Feyer; Mariusz Zubek
A hypocycloidal electron monochromator (HEM) which uses a uniform axial magnetic field and a cylindrical electric field has been investigated in a computational study using the CPO–3D program. Electron trajectories in the monochromator have been calculated and analysed for an incident electron beam which has a finite angular spread. The energy spread of the electron beam at the exit of the monochromator has been studied as a function of the monochromator parameters. It has been found that the energy resolution of the studied HEM is higher than that of an equivalent trochoidal electron monochromator.
Physical Review A | 2006
Ireneusz Linert; Brygida Mielewska; Mariusz Zubek; G C King
Differential cross sections for elastic electron scattering in neon have been measured in the angular range of backward scattering from 110 degree sign -180 degree sign at incident energies of 7, 10, and 15 eV. These measurements combined the use of a magnetic angle changer and an electrostatic electron spectrometer. The differential cross sections measured in the above scattering angle range, together with results obtained previously in the range below 110 degree sign , have been integrated to obtain integral elastic and momentum transfer cross sections. Detailed comparison is presented of the measured differential and integral cross sections with the results of various theoretical calculations.
European Physical Journal D | 2012
Ireneusz Linert; Marcin Dampc; Brygida Mielewska; Mariusz Zubek
Chemical Physics | 2009
Marcin Dampc; Brygida Mielewska; Michele R.F. Siggel-King; G C King; Mariusz Zubek
Physical Review A | 2004
Brygida Mielewska; Ireneusz Linert; George C. King; Mariusz Zubek