Electron impact total cross section for acetylene over an extensive range of impact energies (1 eV–5000 eV)

Abstract

Comprehensive study on electron impact for acetylene molecule is performed in terms of eigenphase diagram, electronic excitation cross sections as well as total cross section calculations from 1 eV to 5000 eV in this article. Computation of cross section over such a wide range of energy is reported for the first time. We have employed two distinct formalisms to derive cross sections in these impact energies. From 1 eV to ionization threshold of the target we have used the ab initio R-matrix method and then spherical complex optical potential method beyond that. At the crossing point of energy, both theories matched quite well and hence prove that they are consistent with each other. The results presented here expectedly give excellent agreement with other experimental values and theories available. The techniques employed here are well established and can be used to predict cross sections for other targets where data are scarce or not available. Also, this methodology may be integrated to online database such as Virtual Atomic and Molecular Data Centre to provide cross section data required by any user.

Computation of electron-impact rotationally elastic total cross sections for methanol over an extensive range of impact energy (0.1 – 2000 eV)

“…The results obtained from the two different methods are consistent and there is a smooth transition at the overlap of the two formalisms. Thus, it is possible to provide the total cross section over a wide range of impact energies from meV to keV for a variety of targets [43][44][45][46][47]. We have presented our results in graphical form (Figs.…”

Electron-impact total cross sections for inelastic processes for furan, tetrahydrofuran and 2,5-dimethylfuran

“…The target parameter is very important since it determines a threshold below which V abs = 0, implying that inelastic, such as ionisation or excitation, channels are prevented energetically below the value of . In order to include the electronic excitations due to discrete levels at lower energy, we have considered as the energy-dependent parameter, which accounts for penetration of the absorption potential in the target charge-cloud region [29,30]. The following equation shows the smooth variation of around I:…”

Cross Sections for Electron Collisions with Acetylene

“…At 6 eV, another 2 S g 1 resonant state was observed. 26 In the TCS, this latter resonance appears as a broad maximum, with a somewhat similar amplitude (about 27 3 10 216 cm 2 ) and position (about 8 eV) to that in CH 4 , see Song et al 23 A number of theoretical studies have also characterized these resonances [27][28][29][30][31] generally via consideration of elastic scattering. These studies will be considered as appropriate below.…”

“…Finally, we note that Vinodkumar et al 31 present some calculated electronic excitation cross sections. However, these calculations provide no indication of uncertainties so it is difficult to use them as the basis for a recommendation.…”