An investigation into electron scattering from pyrazine at intermediate and high energies

Abstract

Total electron scattering cross sections for pyrazine in the energy range 10-500 eV have been measured with a new magnetically confined electron transmission-beam apparatus. Theoretical differential and integral elastic, as well as integral inelastic, cross sections have been calculated by means of a screening-corrected form of the independent-atom representation (IAM-SCAR) from 10 to 1000 eV incident electron energies. The present experimental and theoretical total cross sections show a good level of agreement, to within 10%, in the overlapping energy range. Consistency of these results with previous calculations (i.e., the R-matrix and Schwinger Multichannel methods) and elastic scattering measurements at lower energies, below 10 eV, is also discussed. © 2013 AIP Publishing LLC.

Integral cross sections for electron impact excitation of vibrational and electronic states in phenol

“…With that approach, the IAM-SCAR has been known to provide a good description of the scattering process down to ∼20 eV for some molecules. [33][34][35] On the other hand, there are other systems [36][37][38] where the IAM-SCAR approach results do not agree well with the measured cross sections at even 50 eV, so that caution in its application must still be exercised.…”

“…When those factors are combined in quadrature, the errors on our ICS (see Tables I and II) are found to be in the range 7%-83%, the precise error depending on the inelastic channel in question with the highest uncertainties being found for band 1 (unresolved triplet) electronic-states and the CH-stretch overtone. We have also previously described our IAM-SCAR computations many times, 20,30,[33][34][35] so that only a précis need be given here. Basically, an atomic optical potential scattering model calculates all the phase shifts for each of the atoms that comprise the molecule in question (i.e., carbon, oxygen, and hydrogen for phenol).…”

The electron-furfural scattering dynamics for 63 energetically open electronic states

“…Note that this follows on from a similarly extensive study on phenol, [15][16][17][18][19][20] another important by-product from the application of atmosphericpressure plasmas to biomass. While our independent atom model with screening corrected additivity rule (IAM-SCAR) calculations have had some success, in describing the electron scattering process down to energies (E 0 ) ∼ 20 eV with some molecules, [21][22][23] there are other systems [24][25][26] where this approach does not yield cross sections that are in agreement with measured data for energies as high as 50 eV. In response to this, at least in part, Blanco and García 27 recently extended their IAM-SCAR approach to account for multi-centre scattering (i.e., interference (I)) effects (thus now known as the IAM-SCAR+I method).…”

“…Recall that in principle this approach can calculate elastic differential and integral cross sections, inelastic integral cross sections (as a sum of the ICS for discrete inelastic processes, dissociation processes, and ionization) and if the species is polar (as furfural is) rotational ICSs through a Born-dipole method. [21][22][23][24] The total cross section is then simply determined as the sum of all the aforementioned ICSs. Testing the validity of the inelastic ICSs from the current IAM-SCAR+I calculations forms a second rationale for the present study.…”

Experimental and theoretical cross sections for positron scattering from the pentane isomers

“…The TCSs measured at Trento are uncorrected for the forward angle scattering effect (Sanz et al, 2013a). Therefore, they represent a lower bound on the "true" TCS values.…”