Low-energy electron scattering with H sub 2 O and NH sub 3 molecules

Journal Article · Wed Apr 01 04:00:00 EST 1992 · Physical Review A. General Physics; (United States)

DOI:https://doi.org/10.1103/PhysRevA.45.4565· OSTI ID:7043696

Yuan, J; Zhang, Z ^[1]

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1. China Center of Advanced Science and Technology (World Laboratory), P.O. Box 8730, Beijing 100080 (China) Department of Applied Physics, National University of Defense Technology, Changsha, Hunan 410073 (China)

Calculated total, differential, and momentum-transfer cross sections are reported for the vibrationally elastic scattering of electrons from H{sub 2}O and NH{sub 3} molecules in the range of energy 0.5--20 eV. The total cross sections are approximated by a sum of the rotationally elastic ones and the rotational transition from ground to first excited state (00{r arrow}10). The first-order Born approximation with the rotating-molecule model is used in the calculation of the first rotational excitation cross section. The experimental value of the dipole moments of H{sub 2}O and NH{sub 3} are used in this step of the calculation. Spherically approximate molecular wave functions are applied to calculate the spherical part of the interactions of the incident electron with the molecule and the rotationally elastic-scattering cross section, in which the static and exchange interactions are calculated exactly within the accuracy of the molecular wave function and a parameter-free correlation-polarization potential is used to account for the polarization effect. The agreement of the differential cross sections with the experimental data is good at small angles and reasonably good at intermediate and large angles. Good agreement with measured values is obtained for the momentum-transfer cross sections. Total cross sections are reported with theoretical results on the {ital e}-NH{sub 3} system below 10 eV. The possible sources of the discrepancies between the current theoretical and experimental results are analyzed for the total cross sections at very low energies by a quantitative consideration of the contributions of very strong forward scattering at near-zero angles to the total cross sections.

• OSTI ID: 7043696
• Journal Information: Physical Review A. General Physics; (United States), Journal Name: Physical Review A. General Physics; (United States) Vol. 45:7; ISSN 1050-2947; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
AMMONIA
CALCULATION METHODS
COLLISIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
ELASTIC SCATTERING
ELECTRON COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ENERGY LEVELS
ENERGY RANGE
EV RANGE
EV RANGE 01-10
EV RANGE 10-100
EXCITED STATES
HYDRIDES
HYDROGEN COMPOUNDS
MOLECULE COLLISIONS
MOMENTUM TRANSFER
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
OXYGEN COMPOUNDS
ROTATIONAL STATES
SCATTERING
TOTAL CROSS SECTIONS
VIBRATIONAL STATES
WATER