B. Najjari
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View article: Breakup of positronium by Compton scattering of high-energy photons
Breakup of positronium by Compton scattering of high-energy photons Open
We study the breakup of positronium (Ps) by Compton scattering in the range of photon energies, where the motion of the electron and the positron remains nonrelativistic and the process is dominated by the interaction terms ∼Â2, where  is…
View article: State-selective charge exchange cross sections in collisions of highly-charged sulfur ions with helium and molecular hydrogen
State-selective charge exchange cross sections in collisions of highly-charged sulfur ions with helium and molecular hydrogen Open
The state-selective cross section data are useful for understanding and modeling the x-ray emission in celestial observations. In the present work, using the cold target recoil ion momentum spectroscopy, for the first time we investigated …
View article: Fragmentation of the 4He2 dimer with the emission of three or four electrons by fast highly charged projectiles
Fragmentation of the 4He2 dimer with the emission of three or four electrons by fast highly charged projectiles Open
We investigate the fragmentation of the helium dimer, 4 He 2 , into He 2+ + He + and He 2+ + He 2+ ions in collisions with fast highly charged projectiles. We discuss the main physical mechanisms driving these processes. We explore the ene…
View article: Probing Atomic ‘Quantum Grating’ by Collisions with Charged Particles
Probing Atomic ‘Quantum Grating’ by Collisions with Charged Particles Open
The wave function of an atom, which passed through a diffraction grating, is characterized by a regular space structure. Correspondingly, the interaction of another particle with this atom can be viewed as scattering on an ‘atomic quantum …
View article: Probing the Helium Dimer by Relativistic Highly Charged Projectiles
Probing the Helium Dimer by Relativistic Highly Charged Projectiles Open
We study the fragmentation of He$_2$ dimers into He$^+$ ions by relativistic highly-charged projectiles. It is demonstrated that the interaction between an ultrafast projectile with an extremely extended object -- the helium dimer -- posse…
View article: Photofragmentation of large dimers into singly charged ions via the knockout mechanism
Photofragmentation of large dimers into singly charged ions via the knockout mechanism Open
We study the fragmentation of very large dimers into two singly charged ions\ncaused by absorption of a photon. In this process a photo electron emitted from\none atom of the dimer has certain chances to hit the other atom knocking out\non…
View article: Photoionization of a quantum grating formed by a single atom
Photoionization of a quantum grating formed by a single atom Open
When an atom passes through a macroscopic diffraction grating its wave function acquires a regular space structure and its collision by another particle can be thought of as scattering, of the latter, on a grating composed of a single atom…
View article: Photo ionization of an atom passed through a diffraction grating
Photo ionization of an atom passed through a diffraction grating Open
We consider photo ionization of an atom which, due to passing through a diffraction grating, is prepared in a multi-site state possessing a periodic space structure with alternating maxima and minima. It has been found that this process qu…
View article: Photoelectron satellite spectroscopy and angular distribution of argon atoms using a monochromatic EUV source based on high-order harmonic generation
Photoelectron satellite spectroscopy and angular distribution of argon atoms using a monochromatic EUV source based on high-order harmonic generation Open
Photoelectron satellite spectra and angular distribution of argon atoms were measured in the energy range of 34-43 eV, using a well-developed reaction microscope mounted on a newly built high-order harmonic generation (HHG) extreme ultravi…
View article: Probing atomic 'quantum grating' by collisions with charged projectiles
Probing atomic 'quantum grating' by collisions with charged projectiles Open
The wave function of an atom passed through a diffraction grating acquires a regular space structure and the interaction of another particle with this atom can be thought of as scattering on a 'quantum grating' composed of a single atom. P…
View article: Electron- and proton-impact excitation of heliumlike uranium in relativistic collisions
Electron- and proton-impact excitation of heliumlike uranium in relativistic collisions Open
We have studied the $K$-shell excitation of He-like uranium ($\\textbf{U}^{90+}$) in relativistic collisions with hydrogen and argon atoms. Performing measurements with different targets, as well as with different collision energies, enabl…