Rotational Transition in Polar Molecules by Electron Collisions. : II. Differential Cross Sections
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Differential cross sections are calculated for the electron-impact rotational transitions in two polar molecules, CN and HCl, using the close-coupling method. The rotational states l=0, 1, 2 of the molecules are taken to be coupled and the cross sections for the transitions 0⇾0 and 0⇾1 are obtained. For 0⇾1, the calculation shows that: i) scattering is strongly confined to the forward direction, corresponding to the long-range nature of the dipole interaction; ii) when comparison with the Born approximation is made, the Born result agrees well with the close-coupling calculation, especially for small angle scattering. Finally, momentum-transfer cross section σ_m is calculated and it is found that the dependence of σ_m on the dipole moment D is similar to the result obtained in the approximation of fixed dipole; the calculated value of σ_m has a maximum peak at D∼1 a.u. and, in the vicinity of the peak, appreciably exceeds the Born estimate.
- 社団法人日本物理学会の論文
- 1969-08-05
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