Positron collisions with ethene

Bettega, M. H. F.; Sanchez, S. d’A.; Varella, Márcio T. do N.; Lima, Marco A. P.; Chiari, Luca; Zecca, Antonio; Trainotti, Emanuele; Brunger, M. J.

doi:10.1103/physreva.86.022709

Cited by 15 publications

(23 citation statements)

References 52 publications

(73 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This difference in the signs of the potential makes the positron calculation a more challenging task when compared to electron scattering. Our present calculated ICS is compared with the previous experimental TCS from Makochekanwa et al 9 Additionally, we compare our current data with theoretical and experimental data for the ethylene (C 2 H 4 ) molecule reported by Bettega et al 14 and Sueoka and Mori. 15 The outline of this paper is as follows.…”

Section: Introductionsupporting

confidence: 55%

See 1 more Smart Citation

Elastic Positron Collisions with 1,1-Difluoroethylene

et al. 2021

View full text Add to dashboard Cite

This work reports a theoretical investigation on the elastic-positron collision with the 1,1-difluoroethylene molecule for energies up to 10 eV. We have employed the Schwinger multichannel method in the static-plus polarization level of approximation to obtain the integral and differential cross sections. In order to account for the long-range potential due to the permanent dipole moment of the target, the Born-closure procedure has been employed. Also, our present differential cross sections have been applied to estimate a correction to the total cross section measurements available in the literature.

show abstract

Section: Introductionsupporting

confidence: 55%

“…For the sake of comparison, we have also included the data for C 2 H 4 reported by Bettega et al 14 and Sueoka and Mori in Figure 2. 15 Our present ICS + Born results present the same overall behavior as those (experimental and theoretical) data reported for the ethylene molecule.…”

Section: Resultsmentioning

confidence: 99%

Elastic Positron Collisions with 1,1-Difluoroethylene

et al. 2021

View full text Add to dashboard Cite

show abstract

“…We see that the TCS decreases monotonically in magnitude as a function of the incident energy except for a small bump centered at around 6 eV, which is likely to arise from the opening of the Ps formation channel (see Table I). This TCS behavior is not surprising as we have observed similar trends in our earlier investigations on positron collisions with non-polar polyatomic molecules (e.g., Bettega et al, 2012;Chiari et al, 2013c;and 2014c). In those studies, we mainly ascribed that kind of behavior in the TCS to the attractive dipole interaction between the incident positron and the target molecule, which can overcome the Coulomb repulsion at those low impact energies.…”

Section: A N-pentanementioning

confidence: 53%

“…In those studies, we mainly ascribed that kind of behavior in the TCS to the attractive dipole interaction between the incident positron and the target molecule, which can overcome the Coulomb repulsion at those low impact energies. However, we note that the presence of a virtual state for positron binding at very low energies was also found to contribute to the sharp increase in the TCS for some of those targets (Bettega et al, 2012;Zecca et al, 2012c;and Chiari et al, 2013c). The very low-energy behaviour of the TCSs plotted in Fig.…”

Section: A N-pentanementioning

confidence: 99%

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

Chiari

Zecca

Blanco

et al. 2016

The Journal of Chemical Physics

View full text Add to dashboard Cite

Isomerism is ubiquitous in chemistry, physics, and biology. In atomic and molecular physics, in particular, isomer effects are well known in electron-impact phenomena; however, very little is known for positron collisions. Here we report on a set of experimental and theoretical cross sections for low-energy positron scattering from the three structural isomers of pentane: normal-pentane, isopentane, and neopentane. Total cross sections for positron scattering from normal-pentane and isopentane were measured at the University of Trento at incident energies between 0.1 and 50 eV. Calculations of the total cross sections, integral cross sections for elastic scattering, positronium formation, and electronic excitations plus direct ionization, as well as elastic differential cross sections were computed for all three isomers between 1 and 1000 eV using the independent atom model with screening corrected additivity rule. No definitive evidence of a significant isomer effect in positron scattering from the pentane isomers appears to be present.

show abstract

“…It is now clear that experiment alone cannot provide such a comprehensive data base [10], so that theoretical models need to be developed to fulfill that role. Such models might include the B-spline R-matrix approach for electron-atom scattering [11], an equivalent Rmatrix method for electron-molecule scattering [12], Schwinger Multichannel (SMC) methods [13,14], the Kohn-Variational approach [15] and our own independent atom method with screening-corrected additivity rule (IAM-SCAR) model [16,17]. However, we note that experimental data will continue to play a vital role in benchmarking theory [10].…”

Section: Introductionmentioning

confidence: 99%

Recent progress in electron scattering from atoms and molecules

Brunger

Buckman

Sullivan

et al. 2014

AIP Conference Proceedings

View full text Add to dashboard Cite

We present and discuss recent results, both experimental and theoretical (where possible), for electron impact excitation of the 3s[ 3 / 2 ] 1 and 3s ' [ 1 / 2 ] 1 electronic states in neon, elastic electron scattering from the structurally similar molecules benzene, pyrazine, and 1,4-dioxane and excitation of the electronic states of the important bio-molecule analogue α-tetrahydrofurfuryl alcohol. While comparison between theoretical and experimental results suggests that benchmarked cross sections for electron scattering from atoms is feasible in the near-term, significant further theoretical development for electron-molecule collisions, particularly in respect to discrete excitation processes, is still required.

show abstract

Positron collisions with ethene

Cited by 15 publications

References 52 publications

Elastic Positron Collisions with 1,1-Difluoroethylene

Elastic Positron Collisions with 1,1-Difluoroethylene

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

Recent progress in electron scattering from atoms and molecules

Contact Info

Product

Resources

About