Elastic cross sections for electron-ozone collisions

Abstract

We report a theoretical study of elastic electron-O 3 collisions in the 3-80 eV energy range. Calculations are carried out in a fixed-nuclei approximation at the ground-state equilibrium geometry of ozone. The Schwinger variational iterative method is used to calculate the low partial-wave scattering amplitudes at the static-exchange level whereas higher partialwave contributions were taken into account through a Born-closure procedure using a pointdipole potential. The results presented are compared with available experimental and theoretical data in the literature and results are encouraging.

Elastic scattering of low-energy electrons by ozone

“…The results of this procedure are shown in figure 2. We found that the structures belongs to A 1 (E ∼ 8.5 eV) and B 2 (E ∼ 13 eV) symmetries in agreement with the results of Sarpal et al, also shown in figure 2, Lee et al [7] and with the observations of Allan et al [5]. Although not shown here, our eigenphase sum for A 1 and B 2 symmetries also agree with those obtained in a previous work of Sarpal et al [4] near resonance.…”

“…In figure 1 we show our integral cross section and compare it with theoretical results of Okamoto et al [3], Sarpal et al [6], Lee et al [7] and Gianturco et al [8] and with experimental data of Shyn et al [2]. We found excellent agreement with results of Sarpal et al, obtained with the polyatomic R-matrix method and a good agreement with experimental data of Shyn et al [2].…”

“…The scattering orbitals are distributed by symmetry as follows: 35 for A 1 , 15 for B 1 , 27 for B 2 , and 10 for A 2 . Our calculated dipole moment is 0.76 Debye and the results of [3,4,[6][7][8] are 0.86, 0.84, 0.91 and 0.76 Debye respectively. The experimental dipole moment is 0.53 Debye [16].…”

“…Integral cross section for O 3 . Full curve, our pseudopotentials results; broken curve, theoretical static-exchange results of [6]; chain curve with triangles, theoretical results of [3]; dotted curve, theoretical results of [7]; chain curve with circles, theoretical results of [8]; diamonds, experimental data of [2].…”

“…They measured elastic and vibrationally inelastic cross sections for O 3 , and observed two shape resonances: at 4.2 eV (A 1 symmetry) and 6.6 eV (B 2 symmetry). Lee et al, using the Schwinger variational iterative method (SVIM), reported cross section for e − -O 3 collision [7]. They also found two resonances at higher energies (at 11 eV, for A 1 and at 14 eV for B 2 ).…”