منابع مشابه
ELECTRON IMPACT EXCITATION OF Fe II AND BORON-LIKE IONS
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 ionization of Mg
A pulsed crossed beam technique is used to measure ionization cross-sections of metallic atoms. Relative values of cross-sections of single, double and triple ionization of magnesium have been successfully measured with good accuracy over the 0-700 eV range. Absolute values of cross-sections have been obtained by normalization to a theoretical value at high electron energy. Results are compared...
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 ...
متن کاملElectron-impact rotational excitation of water
Rotational excitation of H2O, HDO and D2O by thermal electron impact is studied using the molecular R-matrix method. Rate coefficients are obtained up to electron temperatures of 8000 K. De-excitation rates and critical electron densities are also given. It is shown that the dominant transitions are those for which J = 0, ±1, as predicted by the dipolar Born approximation. However, a pure Born ...
متن کاملElectron-impact vibrational excitation of cyclopropane.
We report a very detailed test of the ab initio discrete momentum representation (DMR) method of calculating vibrational excitation of polyatomic molecules by electron impact, by comparison of its results with an extensive set of experimental data, covering the entire range of scattering angles from 10° to 180° and electron energies from 0.4 to 20 eV. The DMR calculations were carried out by so...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2008
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:200809998