A5083825677- Atomic and Molecular Physics
- Electron and X-Ray Spectroscopy Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Atmospheric Ozone and Climate
- Advanced Chemical Physics Studies
- Laser-induced spectroscopy and plasma
- Mass Spectrometry Techniques and Applications
- Crystallography and molecular interactions
- Luminescence Properties of Advanced Materials
- Astrophysics and Star Formation Studies
- Solar and Space Plasma Dynamics
- Energetic Materials and Combustion
- Quantum, superfluid, helium dynamics
- Spectroscopy and Laser Applications
- Photochemistry and Electron Transfer Studies
- nanoparticles nucleation surface interactions
- Ionosphere and magnetosphere dynamics
- Hemoglobin structure and function
- Chemical Thermodynamics and Molecular Structure
- Radiation Therapy and Dosimetry
- Spectroscopy and Quantum Chemical Studies
- Various Chemistry Research Topics
- Atmospheric chemistry and aerosols
- Metal complexes synthesis and properties
- Free Radicals and Antioxidants
Institute of Physics Belgrade
2008-2024
University of Belgrade
2011-2023
Abstract This roadmap article highlights recent advances, challenges and future prospects in studies of the dynamics molecules clusters gas phase. It comprises nineteen contributions by scientists with leading expertise complementary experimental theoretical techniques to probe on timescales spanning twenty order magnitudes, from attoseconds minutes beyond, for systems ranging complexity smallest (diatomic) nanoparticles. Combining some these opens up new avenues unravel hitherto unexplored...
The fragmentation of the 2Br-pyrimidine molecule following direct valence photoionization or inner shell excitation has been studied by electron-ion coincidence experiments. chosen as a model for class pyrimidinic building blocks three nucleic acids and several radiosensitizers. It is known that site- state-localization energy deposition, typical excitation, results in enhancement total ion yield well changes relative intensity different channels. Here we address question origin this...
A combined experimental and theoretical approach has been used to disentangle the fundamental mechanisms of fragmentation three isomers nitroimidazole induced by vacuum ultra-violet (VUV) radiation, namely, 4-, 5-, 2-nitroimidazole. The results mass spectrometry as well photoelectron-photoion coincidence spectroscopy display striking differences in radiation-induced decomposition different radical cations. Based on density functional theory (DFT) calculations, a model is proposed which fully...
The results of experimental and theoretical studies on elastic-electron scattering by indium atom are presented. measurements performed at incident electron energies ${E}_{0}=10$, 20, 40, 60, 80, 100 eV within the angles ranging from $10\ifmmode^\circ\else\textdegree\fi{}$ to $150\ifmmode^\circ\else\textdegree\fi{}$. Theoretical calculations have been carried out using both complex real optical potentials cover energy range up ${E}_{0}=350\text{ }\text{eV}$. We report relative differential...
Differential (DCS), integral $({Q}_{\mathrm{I}})$, momentum transfer $({Q}_{\mathrm{M}})$, and viscosity $({Q}_{\mathrm{V}})$ cross sections are obtained both experimentally theoretically for elastic electron scattering by lead atoms in the energy range from $10\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}100\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$. The experiment is performed using an spectrometer with crossed atom-beam arrangement. relative DCS measurements placed on...
Photoionization mass spectrometry, photoelectron-photoion coincidence spectroscopic technique, and computational methods have been combined to investigate the fragmentation of two nitroimidazole derived compounds: metronidazole misonidazole. These molecules are used in radiotherapy thanks their capability sensitize hypoxic tumor cells radiation by "mimicking" effects presence oxygen as a damaging agent. Previous investigations patterns isomers (Bolognesi et al., 2016; Cartoni 2018) shown...
Tunability and selectivity of synchrotron radiation have been used to study the excitation ionization 2-nitroimidazole at C, N O K-edges. The combination a set different measurements (X-ray photoelectron spectroscopy, near-edge photoabsorption Resonant Auger electron spectroscopy mass spectrometry) computational modelling successfully disclosed local effects due chemical environment on both excitation/ionization fragmentation molecule.
Abstract Photoelectron spectroscopy, mass spectrometry and electron–ion coincidence experiments combined with tunable synchrotron radiation have been used to study the decay fragmentation of 2Cl-pyrimidine after Cl(2p), C(1s) N(1s) excitations. The goal is investigate how state- site-selected excitation chemical environment affect paths molecule make a comparison induced by direct valence ionization. It has found that site-selective inner shell affects branching ratio fragments, while...
We measure the differential cross sections (DCSs) for electron-impact excitation of combined (two fine-structure levels) resonant $4{d}^{10}5p\phantom{\rule{0.16em}{0ex}}^{2}P_{1/2,3/2}$ and $4{d}^{9}5{s}^{2}\phantom{\rule{0.16em}{0ex}}^{2}D_{5/2}$ states in silver from $4{d}^{10}5s\phantom{\rule{0.16em}{0ex}}^{2}S_{1/2}$ ground state. A comparison with predictions relativistic distorted-wave (RDW) approximation model is carried out. Relativistic calculations are performed each level...
This paper presents absolute differential cross sections (DCSs) and integrated (ICSs) for both elastic inelastic electron scattering by lead silver atoms in the energy range from 10 to 100 eV. The DCSs were measured as a function of angle. Scattering angles are 1° 150° excitations unresolved 4d105p2P1/2, 3/2 line 6p7s3P0,1 line, while they span 10° 150°. measurements utilize crossed beam technique with effusive atomic being perpendicularly beam. Monoenergetic is obtained means hemispherical...
Electron-impact processes involving molecular ions provides valuable insights into the chemical complexity and dynamics of astrophysical environments. These are particularly important in understanding chemistry environments such as interstellar clouds planetary atmospheres (Dimitrijević et al. 2021, Srećković 2020). Understanding electron-impact astrophysics requires a combination theoretical modeling, laboratory experiments, observational data (Albert Here we report new for some small...
Atomic and molecular collisional radiative processes are crucial for understanding the different environments within our universe (Albert et al. 2020). Data databases on atomic have grown in importance constructing models simulations of complex physical/chemical processes, as well interpreting observations measurement findings a variety sectors (Srećković The data can be used applications, such modeling non-local thermal equilibrium early universe's chemistry, solar atmosphere, white dwarf...
New findings in the fields of atmospheric science, astrochemistry etc. have been made possible by recent experimental and theoretical developments. One most crucial processes planetary atmospheres interstellar media is photodissociation. A brief overview fundamental physical including photodissociation photoionization molecules astronomical interest as well new astrophysically relevant molecular species recently added to Leiden VUV cross section database (Hrodmarsson Dishoeck, 2023). The...
Abstract: Diagnostics, the development of models and simulations intricate physical processes, interpretation data from measurements all depend more on atomic molecular (A&M) datasets, databases, broader environments (see e.g. Albert et al. 2020, Srećković 2020). Precise spectroscopy ions pave way for investigation tiny molecules such as SiH+, CaH+, others that may be present astrophysically, which can in turn lead to better understanding some stellar processes formation interstellar...
In crossed electron beam - Indium atom scattering experiments the measured signal arises from a spatial region (the 'interaction volume') defined by overlap of and target view cone detector. The exchange interaction volume with angle, named correction factor is discussed. approach R. T. Brinkmann S. Trajmar (J. Phys. E 14, 245-254 (1981)) adopted for our experimental conditions to determine accordingly transfer angular distributions scattered electrons relative differential cross sections.
We present angle-differential and angle-integrated cross sections for electron-impact excitation of the ($4{d}^{10}5s)\phantom{\rule{0.16em}{0ex}}^{2}S_{1/2}\ensuremath{\rightarrow}(4{d}^{9}5{s}^{2})\phantom{\rule{0.16em}{0ex}}^{2}D_{3/2}$ $(4{d}^{10}5s)\phantom{\rule{0.16em}{0ex}}^{2}S_{1/2}\ensuremath{\rightarrow}(4{d}^{10}6s)\phantom{\rule{0.16em}{0ex}}^{2}S_{1/2}$ transitions in atomic silver. Experimental data four incident electron energies between 10 60 eV are compared with...
The fragmentation of 2Br-, 2Cl- and 5Br-pyrimidine following direct valence photoionization or inner shell excitation decay has been studied by electron-ion coincidence experiments. results show that the is strongly selective on final singly charged ion state dominant patterns correlate to nearest appearance potential.
Differential cross sections (DCSs) for electron impact excitation of the 4d95s2 2D3/2 and 4d106s2 2S1/2 states silver atom have been measured. Relative DCSs obtained by comparing intensities these relative to resonant 2P state at scattering angles from 10° 150° energies 10 eV 60 eV.
The photo-association, charge-exchange, and photo-dissociation absorption processes in non-symmetric systems including hydrogen calcium atoms, ions, molecules, molecular-ions are investigated this paper.For the current computation, we have calculated data for molecules molecular state characterizations.We obtained cross-sections corresponding spectral rate coefficients -as functions of wavelengths, temperatures.The collected has potential an impact on vast additional applications, such as...