scholarly journals Paul Trap Promotion of Electrons in Atomic Collisions

1999 ◽  
Vol 52 (3) ◽  
pp. 431 ◽  
Author(s):  
G. von Oppen ◽  
M. Tschersich ◽  
R. Drozdowski ◽  
M. Busch
Keyword(s):  
Experimental Evidence ◽  
Charged Particles ◽  
Paul Trap ◽  
Excitation Mechanism ◽  
Atomic Collisions ◽  
Intermediate Energies ◽  
Positively Charged ◽  
Coulomb Potentials

Electron promotion on rotating potential saddles is proposed as an important and efficient excitation mechanism taking place in atomic collisions at intermediate energies. Measurements on the excitation of atoms by positively charged particles, in particular, excitation of He I states in p–He collisions provides experimental evidence for this ‘Paul trap’ promotion in two-centre Coulomb potentials.

The interaction of atomic particles with solid surfaces at intermediate energies IV. The energy and angular distributions of particles scattered with electric charge from polycrystalline platinum at bombarding energies of 500-5000 eV

1974 ◽  
Vol 341 (1625) ◽  
pp. 213-231 ◽  
Keyword(s):  
Charged Particles ◽  
Solid Surfaces ◽  
Hydrogen Ion ◽  
Angular Distributions ◽  
Sodium Potassium ◽  
Intermediate Energies ◽  
Polycrystalline Platinum ◽  
Composite Spectra ◽  
Energy And Angular Distributions ◽  
Bombarding Energy

The distributions in angle and energy for charged particles emitted from polycrystalline platinum bombarded with ions of hydrogen, sodium, potassium and some hydrocarbons, have been measured, in continuation of previous work (Cawthron, Cotterell & Oliphant 1969 a , b , parts I and II; 1970, part III) to lower energies. Composite spectra are presented, including ions of both signs. The flux of emitted charged particles, under hydrogen ion bombardment, is shown to contain approximately equal numbers of protons and H¯ ions, except at the lowest bombarding energies, where the latter apparently predominate. Scattering in all cases is shown to increase with bombarding energy over the range covered, the increase being near linear for hydrogen and very rapid for alkalimetal ions. In all cases the total emission of charged particles is very small at the lowest bombarding energies employed.

Experimental Evidence of “In Medio” Effects in Heavy-Ion Collisions at Intermediate Energies

1998 ◽  
pp. 1-11
Author(s):  
A. Badalà ◽  
R. Barbera ◽  
A. Bonasera ◽  
M. Gulino ◽  
A. Palmeri ◽  
...  
Keyword(s):  
Experimental Evidence ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Intermediate Energies ◽  
Ion Collisions

scholarly journals THE ISOSPIN DISTRIBUTION OF FRAGMENTS IN REACTIONS 96Ru + 96Ru, 96Ru + 96Zr, 96Zr + 96Ru, and 96Zr + 96Zr AT BEAM ENERGY 400 AMeV

2002 ◽  
Vol 17 (07) ◽  
pp. 375-385 ◽  
Author(s):  
QINGFENG LI ◽  
ZHUXIA LI
Keyword(s):  
Time Evolution ◽  
Beam Energy ◽  
Charged Particles ◽  
Coulomb Force ◽  
Nuclear Potential ◽  
Intermediate Mass ◽  
Intermediate Energies ◽  
Dependent Part ◽  
Dynamical Balance ◽  
Light Charged Particles

The isospin distribution of particles and fragments in collisions 96Ru + 96Ru, 96Ru + 96Zr, 96Zr + 96Ru and 96Zr + 96Zr at beam energy 400 AMeV is studied with isospin-dependent QMD model. We find that the rapidity distribution of differential neutron–proton counting in neutron rich nucleus–nucleus collisions at intermediate energies is sensitive to the isospin-dependent part of nuclear potential. The study of the N/Z ratio of nucleons, light charged particles (LCP) and intermediate mass fragments (IMF) shows that the isospin-dependent part of nuclear potential drives IMF to be more isospin symmetric and emitted nucleons to be more neutron rich. From the study of the time evolution of the isospin distribution in emitted nucleons, LCP and IMF we find that neutrons diffuse much faster than protons at the beginning and the final isospin distribution is a result of dynamical balance of symmetry potential and Coulomb force under the charge conservation.

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