Electron-impact rotational excitation of water
نویسندگان
چکیده
منابع مشابه
Electron-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 ...
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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...
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Molecular R-matrix calculations are performed to give rotational excitation rates for electron collisions with linear molecular ions. Results are presented for CO, HCO, NO and H2 up to electron temperatures of 10 000 K. De-excitation rates and critical electron densities are also given. It is shown that the widely used Coulomb–Born approximation is valid for Dj 1⁄4 1 transitions when the molecu...
متن کاملCalculation of rate constants for vibrational and rotational excitation of the H3 ion by electron impact
We present theoretical thermally averaged rate constants for vibrational and rotational (de-)excitation of the H3 ion by electron impact. The constants are calculated using the multichannel quantum-defect approach. The calculation includes processes that involve a change | J | ≤ 2 in the rotational angular momentum J of H3 . The rate constants are calculated for states with J ≤ 5 for rotational...
متن کاملElectron-impact rotational excitation of H3+: relevance for thermalization and dissociation dynamics.
Electrons are known to be efficient in rotationally exciting molecular ions in low-density astrophysical plasmas. Rotational excitation of molecular ions has also been shown to affect the measured values of dissociative recombination (DR) rate coefficients. Thus, electron collisions with H3+ are expected to play a significant role in thermalization and dissociation dynamics of this ion, both in...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2004
ISSN: 0035-8711,1365-2966
DOI: 10.1111/j.1365-2966.2004.07209.x