Computation of Electron Impact Cross Sections from Molecules of Astrophysical Importance

Author(s)
Bobby Antony

ABSTRACT

Computations were performed for calculating cross sections of electron impact scattering from astro-physical targets C_{a}F, HCN and H_{2}S at energies lower than their ionization potential. The results show that the use of highly accurate R-matrix method which includes all the relevant physics and chemistry of the molecule in its formalism generate features significantly different from the simple static exchange calculation. The data obtained shows interesting structures in the eigen-phase sums which may be attributed to the dissociation channel of the molecule.

Computations were performed for calculating cross sections of electron impact scattering from astro-physical targets C

KEYWORDS

Electron Scattering, Elasitic Cross Section, R-Matrix Method, Resonance, Dissociative Electron Attachment, Quantemol

Electron Scattering, Elasitic Cross Section, R-Matrix Method, Resonance, Dissociative Electron Attachment, Quantemol

Cite this paper

nullB. Antony, "Computation of Electron Impact Cross Sections from Molecules of Astrophysical Importance,"*Journal of Modern Physics*, Vol. 2 No. 9, 2011, pp. 1088-1092. doi: 10.4236/jmp.2011.29133.

nullB. Antony, "Computation of Electron Impact Cross Sections from Molecules of Astrophysical Importance,"

References

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[8] S. Salvini, P. G. Burke and C. J. Noble, “Electron Scattering by Polar Molecules Using the R-Matrix Method,” Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 17, No. 12, 1984, pp. 2549-2562. doi:10.1088/0022-3700/17/12/022

[9] P. E. Cade and W. M. Huo, “Electronic Structure of Diatomic Molecules. VI.A. Hartree-Fock Wavefunctions and Energy Quantities for the Ground States of the First‐Row Hydrides, AH,” Journal of Chemical Physics, Vol. 47, No. 2, 1967, pp. 614-649. doi:10.1063/1.1711938

[10] I. Rozum, N. J. Mason and J. Tennyson, “Electron Collisions with the CF Radicals Using the R-Matrix Method,” Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 36, No. 12, 2003, pp. 2419-2432. doi:10.1088/0953-4075/36/12/303

[11] B. K. Antony, K. N. Joshipura, N. J. Mason and Jonathan Ten-nyson, “R-Matrix Calculation of Low-Energy Electron Colli-sions with LiH”, Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 37, No. 8, 2004, pp. 1689-1698. doi:10.1088/0953-4075/37/8/010

[1] Y. Itikawa and N. J. Mason, “Cross Sections for Electron Col-lisions with Water Molecules,” Journal of Physical and Chem-ical Reference Data, Vol. 34, No. 1, 2005, pp. 1-23. doi:10.1063/1.1799251

[2] T. E. Cravens, “X-Ray Emission from Comets,” Science, Vol. 296, No. 5570, 2002, pp. 1042-1045.

[3] A. McClaine, R. W. Breault, C. Larsen, R. Konduri, J. Rolfe, F. Becker and G. Miskolczy, “Hydrogen Transmission/Storage with Metal Hydride-Organic Slurry and Advanced Chemical Hydride/Hydrogen for PEMFC Vehicles,” Proceedings of 2000 US DOE Hydrogen Programme Review NREL/CP, Vol. 570, 2000, p. 28890.

[4] E. Bodo, F. A. Gianturco and R. Martinazzo, “The Gas-Phase Lithium Chemistry in the Early Universe: Elementary Processes, Interaction Forces and Quantum Dynamics,” Physics Reports, Vol. 384, No. 3, 2003, pp. 85-119. doi:10.1016/S0370-1573(03)00243-6

[5] V. K. Dubrovich, “Spectral-Spatial Fluctuations of the Relic Radiation-A New Class of Objects in the Universe,” Astro-nomical and Astrophysical Transactions, Vol. 5, No. 1-4, 1994, pp. 57-65. doi:10.1080/10556799408245854

[6] L. A. Morgan, J. Tennyson and C. J. Gillan, “The UK Molecu-lar R-Matrix Codes,” Computer Physics Communications, Vol. 114, No. 1-3, 1998, pp. 120-128. doi:10.1016/S0010-4655(98)00056-3

[7] P. G. Burke and K. A. Berrington, “Atomic and Molecular Processes: An R--matrix Approach,” Institute of Physics Pub-lishing, London, 1993.

[8] S. Salvini, P. G. Burke and C. J. Noble, “Electron Scattering by Polar Molecules Using the R-Matrix Method,” Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 17, No. 12, 1984, pp. 2549-2562. doi:10.1088/0022-3700/17/12/022

[9] P. E. Cade and W. M. Huo, “Electronic Structure of Diatomic Molecules. VI.A. Hartree-Fock Wavefunctions and Energy Quantities for the Ground States of the First‐Row Hydrides, AH,” Journal of Chemical Physics, Vol. 47, No. 2, 1967, pp. 614-649. doi:10.1063/1.1711938

[10] I. Rozum, N. J. Mason and J. Tennyson, “Electron Collisions with the CF Radicals Using the R-Matrix Method,” Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 36, No. 12, 2003, pp. 2419-2432. doi:10.1088/0953-4075/36/12/303

[11] B. K. Antony, K. N. Joshipura, N. J. Mason and Jonathan Ten-nyson, “R-Matrix Calculation of Low-Energy Electron Colli-sions with LiH”, Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 37, No. 8, 2004, pp. 1689-1698. doi:10.1088/0953-4075/37/8/010