Comparison of experimental and theoretical electron-impact-ionization triple-differential cross sections for ethane

Ali, Esam; Nixon, Kate; Murray, Andrea; Ning, Chuangang; Colgan, J.; Madison, Don H.

doi:10.1103/physreva.92.042711

Cited by 23 publications

(16 citation statements)

References 37 publications

(39 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We used two theoretical methods to describe the present electron-impact ionization process. Although they have been described previously [35][36][37][38] we summarize the essential ideas and the particular ingredients for the current cases of interest in order to make this paper self-contained. More detailed information can be found in the references given.…”

Section: Theoretical Modelsmentioning

confidence: 99%

See 1 more Smart Citation

Electron-impact ionization of H2O at low projectile energy: Internormalized triple-differential cross sections in three-dimensional kinematics

et al. 2017

Self Cite

View full text Add to dashboard Cite

We report a combined experimental and theoretical study on the electron-impact ionization of water (H 2 O) at the relatively low incident energy of E 0 = 81 eV in which either the 1b 1 or 3a 1 orbitals are ionized leading to the stable H 2 O + cation. The experimental data were measured using a reaction microscope, which can cover nearly the entire 4π solid angle for the secondary electron emission over a range of ejection energies. We present experimental data for the scattering angles of 6 • and 10 • for the faster of the two outgoing electrons as function of the detection angle of the secondary electron with energies of 5 eV and 10 eV. The experimental triple-differential cross sections are internormalized across the measured scattering angles and ejected energies. The experimental data are compared to predictions from two molecular three-body distorted-wave approaches. One applying the orientation-averaged molecular orbital (OAMO) approximation and one using a proper-average (PA) over orientation-dependent cross sections. The PA calculations are in better agreement with the experimental data than the OAMO calculations, for both the angular dependence and the relative magnitude of the observed cross section structures.

show abstract

Section: Theoretical Modelsmentioning

confidence: 99%

“…where the exchange-scattering T exc is calculated similar to T dir except that the particles 1 and 2 are interchanged in the final state wave function. To take the proper average (PA) over all molecular orientations [37], the TDCS is calculated for each orientation and then averaged over all possible orientations so that…”

Section: Theoretical Modelsmentioning

confidence: 99%

Electron-impact ionization of H2O at low projectile energy: Internormalized triple-differential cross sections in three-dimensional kinematics

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…A summary of this work up to 2010 was given by Madison and Al Hagan [19]. More recently, studies have been performed for ionization of CH 4 [20], [21], tetrahydrofuran and tetrahydrofurfuryl [22], NH3 [23], the cyclic ethers tetrahydrofuran, tetrahydropyran and 1,4-dioxane [24], tetrahydropyran and 1,4-dioxane [25], phenol [26], N 2 [27], ethane [28], and furfural [29]. The M3DW has not been previously applied to CO 2 .…”

mentioning

confidence: 99%

Comparison of experimental and theoretical triple differential cross sections for the single ionization ofCO2 (1πg)by electron impact

et al. 2016

Self Cite

View full text Add to dashboard Cite

Experimental and theoretical triple differential cross sections (TDCSs) for intermediate energy (100 eV-400 eV) electron-impact single ionization of the CO 2 are presented for three fixed projectile scattering angles. Results are presented for ionization of the outer most 1π g molecular orbital of CO 2 in a coplanar asymmetric geometry. The experimental data are compared to predictions from the three center Coulomb continuum (ThCC) approximation for triatomic targets, and the molecular three body distorted wave (M3DW) model. It is observed that while both theories are in reasonable qualitative agreement with experiment, the M3DW is in the best overall agreement with experiment. 1-Introduction Electron impact single ionization of molecules is of interest not only due to practical applications, but also due to obtaining a better understanding of fundamental physics. On the practical application side, studies of electron impact ionization of atmospheric molecules are useful for controlling and monitoring global warming. Information on single ionization of atmospheric molecules is also important both for understanding the development of planetary atmospheres and controlling the events in the ionosphere and its neighboring regions

show abstract

“…However we think that it is still of interest to see how good or bad it is since it is very difficult (for us) to get access to enough computer time to perform the proper averages so it would be useful to know if there are cases where it can be used. So far, we have found that it is not good for some intermediate sized molecules [6], [18][19][20], but suprisingly a reasonably good approximation for the big molecules we have examined [21][22][23][24][25].…”

Section: Theoreticalmentioning

confidence: 99%

Sulphur hexaflouride: low energy (e,2e) experiments and molecular three-body distorted wave theory

Nixon¹,

Murray²,

Chaluvadi³

et al. 2016

J. Phys. B: At. Mol. Opt. Phys.

Self Cite

View full text Add to dashboard Cite

Experimental and theoretical triple differential ionisation cross-sections (TDCS's) are presented for the highest occupied molecular orbital of sulphur hexafluoride. These measurements were performed in the low energy regime, with outgoing electron energies ranging from 5 to 40 eV in a coplanar geometry, and with energies of 10 and 20 eV in a perpendicular geometry. Complementary theoretical predictions of the TDCS were calculated using the molecular three-body distorted wave formalism.Calculations were performed using a proper average over molecular orientations as well as the orientation-averaged molecular orbital approximation. This more sophisticated model was found to be in closer agreement with the experimental data, however neither model accurately predicts the TDCS over all geometries and energies.

show abstract

Comparison of experimental and theoretical electron-impact-ionization triple-differential cross sections for ethane

Cited by 23 publications

References 37 publications

Electron-impact ionization of H2O at low projectile energy: Internormalized triple-differential cross sections in three-dimensional kinematics

Electron-impact ionization of H2O at low projectile energy: Internormalized triple-differential cross sections in three-dimensional kinematics

Comparison of experimental and theoretical triple differential cross sections for the single ionization ofCO2 (1πg)by electron impact

Sulphur hexaflouride: low energy (e,2e) experiments and molecular three-body distorted wave theory

Contact Info

Product

Resources

About