Cross sections for electron scattering by propane in the low- and intermediate-energy ranges

Abstract

We present a joint theoretical-experimental study on electron scattering by propane (C 3 H 8) in the low-and intermediate-energy ranges. Calculated elastic differential, integral, and momentum transfer as well as total (elastic + inelastic) and total absorption cross sections are reported for impact energies ranging from 2 to 500 eV. Also, experimental absolute elastic cross sections are reported in the 40-to 500-eV energy range. A complex optical potential is used to represent the electron-molecule interaction dynamics. A theoretical method based on the single-center-expansion close-coupling framework and corrected by the Padé approximant is used to solve the scattering equations. The experimental angular distributions of the scattered electrons are converted to absolute cross sections using the relative flow technique. The comparison of our calculated with our measured results, as well as with other experimental and theoretical data available in the literature, is encouraging.

Differential elastic electron scattering by pentane

“…Above the ionization potential, this is [46]; Mapstone and Newell [47], × Curry and Newell [48], Merz and Linder [49], ♦ Rawat et al [9], and Fink et al [50]. Propane: Boesten et al [10] and Souza et al [12]. Butane: Sanches et al [13].…”

“…Ignition and reaction chemistry involving excitation, dissociation, and ionization of these molecules in combustion (plasma) processes in automobile engines [3] is governed or catalyzed by energetic electron scattering from these fuel species in the energy region which ranges from 0.1 eV to high energies (>100 eV), but with a maximum around 10 eV [4]. Whereas there exist electron impact data on methane [5][6][7], ethane [8,9], propane [10][11][12], and butane [13], and in references cited within these, there is lack of electron collision data for pentane. The few data available for pentane are those by Freeman et al [14] of total electron cross sections determined from the mobility of electrons in liquid pentane at the energies of 0.1 to 0.5 eV using a time-of-flight method and those by Kimura et al [15] of gaseous pentane of total cross sections for this target.…”

Absorption effects in electron–sulfur-dioxide collisions

“…In the present work, a modified version of the quasifree scattering model (QFSM) of Staszewska et al [50], known as the scaled quasifree scattering model (SQFSM) [49,51], is used to account for the absorption effects. The SQFSM has already been successfully applied to investigate electron collisions on several targets [49,[51][52][53][54][55]. Also recently, in a benchmark study Staszewska et al [56] confirmed the effectiveness of the SQFSM in describing electron-atom scattering.…”

Cross sections for electron scattering by formaldehyde and pyrimidine in the low- and intermediate-energy ranges

“…Using this potential, the scattering problem is solved using the numerical solution of the Lippmann-Schwinger (LS) integral equation within the single-center-expansion close-coupling framework and further corrected using the Padé approximant technique. The basic theory of this method has already been presented elsewhere [31] and is only briefly outlined here. The procedure starts by using the two-potential formalism to write the reduced complex optical potential U opt = 2V opt as a sum:…”

“…In general, DCS, ICS, and MTCS calculated using the SQFSM for elastic electron-molecule scattering do not differ significantly from those computed using the QFSM3. However, for a variety of atomic and molecular targets [29][30][31], the agreement between the TCS and total absorption cross sections (TACS) calculated with the SQFSM and the corresponding experimental data is significantly better than the agreement with their QFSM3 counterparts. This improvement was confirmed by a recent benchmark study of Staszewska et al [32] for electron-atom collisions.…”