Rearrangement Collisions. II. Electron Excitation of He (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mn>2</mml:mn></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi>P</mml:mi></mml:math>)

Differential cross sections are calculated for the He (11S→23S) transition within the Born–Oppenheimer approximation. The Bonham–Ochkur (OB) approximation is compared to the exact exchange scattering amplitude and it is found to yield semiquantitative agreement, especially at high incident energies. However, the theoretical results show qualitatively different behavior from recent experimental results. Experimental differential cross sections peak in the forward direction while theory predicts a maximum at large angles.

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Second Born Zero Angle Differential Cross Sections in the High Energy Limit for the Electron Impact Excitation of He: The 23S ← 11S and 23P ← 11S Transitions

Bonham

1972

The Journal of Chemical Physics

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Experimental absolute differential cross section for the excitation of the lowest triplet state of [1.1.1]propellane by electron impact Differential elastic cross sections for high angle electron scattering by He in the intermediate energy region J. Chem. Phys. 64, 3886 (1976); 10.1063/1.432706Electron impact excitation of the 11 S→23 S transition in helium; differential crosssection determinations at high incident kinetic energiesThe high energy limit of the inelastic differential cross section for the excitation of the 2 3 S and 2 3 P states of He from the ground state in the forward direction is investigated by expanding the T matrix in powers of V about zero scattering angle and considering all terms proportional to V and V2 where V is the interaction potential. It is shown that the leading terms in a power series in the reciprocal of the incident energy in this second Born infinite channel close coupling theory can qualitatively account for the observed enhancement of the exchange cross section in the forward direction over the predictions of the first Born theory. The ratio of the square of the leading second Born term to the square of the leading first Born term is shown to be proportional to the incident energy for the 23S~PS transitions and of the same order in the incident energy as the first Born form in the case of the 23p~pS transition. The value of the ratio at 500 eV for the 23S~PP transition is estimated to be close to 100 and is relatively independent of the choice of an effective energy loss parameter introduced to carry out the sum over intermediate states.

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Rearrangement Collisions. II. Electron Excitation of He (23P)

Cited by 10 publications

References 15 publications

Bound-state effects in atomic rearrangement collisions

Bound-state effects in atomic rearrangement collisions

Inapplicability of the Born Exchange Scattering Amplitude for the He (11S→23S) Transition

Second Born Zero Angle Differential Cross Sections in the High Energy Limit for the Electron Impact Excitation of He: The 23S ← 11S and 23P ← 11S Transitions

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