منابع مشابه
Electron-impact excitation of Sc II: collision strengths and effective collision strengths for fine-structure transitions
Accurate fine-structure atomic data for the Fe-peak elements are essential for interpreting astronomical spectra. There is a severe paucity of data available for Sc II, highlighted by the fact that no collision strengths are readily available for this ion. We present electron-impact excitation collision strengths and Maxwellian averaged effective collision strengths for Sc II. The collision str...
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Electron impact collision strengths among 560 levels of Si IX, 320 levels of Si X and 350 levels of Si XI have been calculated using the Flexible Atomic Code (FAC) of Gu (2003). Collision strengths Ω at ten scattered electron energies covering an entire energy range, namely 10, 50, 100, 200, 400, 600, 800, 1000, 1500 and 2000 eV, are reported. Assuming a Maxwellian energy distribution, effectiv...
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Collision avoidance is an important topic in multi-robot systems. Existing multi-robot pathfinding approaches ignore sideswipe collisions among robots (i.e., only consider the collision which two agents try to occupy the same node during the same time-step) [1, 3, 4], and allow diagonal move between two adjacent nodes (e.g., Figure 1(b)). However, in many real world applications, sideswipe coll...
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The collisional system Si1He has been studied over a range of mean relative ion kinetic energy going from 10 to 10 eV/amu. In the low-energy range, a time-dependent wave-packet approach is used both in the diabatic and the adiabatic representation using two different propagator techniques. The agreement between the two sets of results assess the accuracy of the present numerical approach. Above...
متن کاملAtomic data from the Iron Project . LXIV . Radiative transition rates and collision strengths for Ca ii ⋆
Aims. This work reports radiative transition rates and electron impact excitation rate coefficients for levels of the n= 3, 4, 5, 6, 7, 8 configurations of Ca ii. Methods. The radiative data were computed using the Thomas-Fermi-Dirac central potential method in the frozen core approximation and includes the polarization interaction between the valence electron and the core using a model potenti...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1989
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/241.2.209