Effective collision strengths for electron impact excitation of $\ion{C}\boldmath$ II
نویسندگان
چکیده
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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The kinetic excitation of electrons upon bombardment of a solid surface with energetic ions is investigated. Using a metal-insulator-metal junction, hot electrons produced by the projectile impact are detected with excitation energies well below the vacuum level. The results provide information that cannot be accessed by electron emission experiments. The observed tunneling current depends on t...
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Effective collision strengths for forbidden transitions among the 5 energetically lowest finestructure levels of O II are calculated in the Breit-Pauli approximation using the R-matrix method. Results are presented for the electron temperature range 100 – 100000 K. The accuracy of the calculations is evaluated via the use of different types of radial orbital sets and a different configuration e...
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The present report consists of two separate items on A. Collisional data for Fe I1 and, B. Collisional data for Boron-like ions. A. Excitation of Fe I1 During the past decade a few pioneering calculations have been carried out for the extremely complex case of Fe 11. The first set of calculations was done using the distorted wave approximation by Nussbaumer and Storey /I/ and Nussbaumer et a1 /...
متن کاملElectron - Impact Excitation of Interstellar Molecules
Electron-molecule collisions play a crucial role in astrophysical environments where the electron fraction is higher than about 10−5, e.g. in the diffuse ISM, PDRs or comets. We present here a brief review of our recent R-matrix calculations of rate coefficients for electron-impact rotational excitation of interstellar molecules. Our major result is the prediction of emission lines from higher ...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2006
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20041855e