نتایج جستجو برای: impact ionisation
تعداد نتایج: 762857 فیلتر نتایج به سال:
We outline progress in a broad range of research projects that are currently being undertaken in our group. These include the formulation of ionisation amplitudes in Coulomb fewbody problems, a new convergent close-coupling implementation for electron-helium collisions, elastic electron-magnesium scattering at very low energies, and the calculation of electron-cesium spin asymmetries and differ...
We present data from the sixth Cassini flyby of Titan (T5), showing that the magnetosphere of Saturn strongly interacts with the moon’s ionosphere and exo-ionosphere. A simple electron ionisation model provides a reasonable agreement with the altitude structure of the ionosphere. Furthermore, we suggest that the dense and cold exo-ionosphere (from the exobase at 1430 km and outward to several T...
Attachment of a proton sponge to a phosphine ligand renders neutral complexes of the ligand highly amenable to analysis by electrospray ionisation mass spectrometry (ESI-MS). The ligand 1,8-bis(dimethylamino)naphthyldiphenylphosphine (3) is extremely efficient and highly selective in forming exclusively [M + H]+ ions, which may be detected at very low concentration. Ionisation efficiency of 3 i...
When biased on the negative differential resistance regime, electroluminescence (EL) is emitted from planar GaAs heterostructure Gunn diodes due to the recombination of electrons in the device channel with holes that are generated by impact ionisation when the Gunn domains reach the anode edge. This EL forms non-uniform patterns whose intensity shows short-range intensity variations in the dire...
Projectile charge dependence of double differential ionisation cross section for H' and ~e:* on He is studied both theoretically and experimentally. The experimental ratio R of the emission induced by 50 and 100 keV/u H+* and H' is compared with calculations from the CDW-EIS model. We report two main effects: a) a decrease of R with increasing angle of electronic emission, b) a sudden enhanceme...
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