منابع مشابه
Electron - 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...
متن کاملVibrational excitation of water by electron impact
Experimental and calculated differential cross sections DCSs for electron-impact excitation of the 010 bending mode and unresolved 100 symmetric and 001 antisymmetric stretching modes of water are presented. Measurements are reported at incident energies of 1–100 eV and scattering angles of 10° –130° and are normalized to the elastic-scattering DCSs for water determined earlier by our group. Th...
متن کاملElectron-impact excitation of neutral oxygen
Aims. To calculate transition rates from ground and excited states in neutral oxygen atoms due to electron collisions for non-LTE modelling of oxygen in late-type stellar atmospheres, thus enabling reliable interpretation of oxygen lines in stellar spectra. Methods. A 38-state R-matrix calculation in LS -coupling has been performed. Basis orbitals from the literature (Thomas et al.) are adopted...
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ژورنال
عنوان ژورنال: Journal of Physics B: Atomic, Molecular and Optical Physics
سال: 2001
ISSN: 0953-4075,1361-6455
DOI: 10.1088/0953-4075/34/22/314