نتایج جستجو برای: electron impact
تعداد نتایج: 1057079 فیلتر نتایج به سال:
in the present paper axial distributions of plasma and floating potentials, electron and iondensities and eedf have been measured in the dl region of a hg discharge constriction. an attempt hasbeen made for the resolution of opposing charged layer structures in dl. excitation processes in theconstriction region are studied. using the linearization method for the nonstationary balance equationss...
Abstrad In T U D envitnnnrm?b, o I)rOJ)cr vector disc:rc</izcr/ion i /wo or /hrw dimensiuns is N I I impurtunt isstre. Pllysiml models like tile impact ionization rate depend on vector quantities. Two discrerization mct11od.s fur Dc~Iuunuy rneslzes bused only on /17e zrtis/rrrc~urc~d ncig/?horhood ir?fomatioit are prc.vcnted. Ol~crall good conwGcmce is uc:hie~~e~I by upplying fhese me/liods in ...
The MAVEN Solar Wind Electron Analyzer (SWEA) is a symmetric hemispheric electrostatic analyzer with deflectors that is designed to measure the energy and angular distributions of 3-4600-eV electrons in the Mars environment. This energy range is important for impact ionization of planetary atmospheric species, and encompasses the solar wind core and halo populations, shock-energized electrons, ...
We have measured electron impact ionization (EII) for Fe forming Fe from below the ionization threshold to 1200 eV. These measurements were carried out at the TSR heavy ion storage ring. The objective of using a storage ring is to store the ion beam initially so that metastable levels decay, thereby allowing for measurements on a well-defined ground-level ion beam. In this case, however, some m...
We explore excitation and ionization by neutron impact as a novel tool for the investigation of electron-electron correlations in helium. We present single- and double-ionization spectra calculated in accurate numerical ab initio simulations for incoming neutrons with kinetic energies of up to 150 keV. The resulting electron spectra are found to be fundamentally different from photoionization o...
Article history: Received 26 August 2014 Received in revised form 1 December 2014 Accepted 1 December 2014 Available online 26 December 2014
The most widely accepted definition of health impact assessment (HIA), from a consensus conference in Gothenburg organised by the World Health Organisation’s (WHO) European Centre for Health Policy, defines HIA as ‘a combination of procedures, methods and tools by which a policy, programme or project may be judged as to its potential effects on the health of a population, and the distribution o...
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