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Joshipura, K. N.; Vinodkumar, Minaxi; Limbachiya, Chetan; Antony, Bobby

doi:10.1103/physreva.69.022705

Cited by 114 publications

(68 citation statements)

References 28 publications

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“…The potential terms in V (r, E i ) are derived from the target charge density. The molecular charge density is constructed through a single centre expansion of the atomic charge density at the molecular centre of mass as in [23]. While the (repulsive) static potential V st (r ) is directly calculated from the target charge density, the polarization effects are included through the positron polarization potential V pol (r ) as given by Zhang et al [24].…”

Section: Theorymentioning

confidence: 99%

“…Our aim is now to deduce Q ion from our calculated Q inel in the same way as in the electron scattering. Hence to find the contribution of Q ion in Q inel we introduce a method which we have applied previously [1,23,[28][29][30][31] for electron impact on several atomic and molecular targets. To proceed along these lines, we have to first obtain Q inel without Ps-formation cross-section.…”

Section: Theorymentioning

confidence: 99%

“…Chaudhuri et al [22] calculated the positron impact excitation cross-sections using the Schwinger multichannel method only for the a 1 g final state of N 2 . Our approximation, called CSP-ic method, has been successful for electron impact ionization along with total excitation cross-sections of N 2 and other targets [1,23].…”

Section: Introductionmentioning

confidence: 99%

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Total and ionization cross-sections of N2 and CO by positron impact: Theoretical investigations

Kothari

Joshipura

2011

Pramana - J Phys

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In this paper we report our calculations on several important total cross-sections (TCSs) of positron impact on isoelectronic N 2 and CO molecules, treated in the complex spherical potential formalism. Basically the total (complete) cross-section Q T consists of elastic and inelastic contributions. Our total inelastic cross-section (Q inel ) contains ionization and electronic excitations together with positronium formation. Our goal here is to bifurcate Q inel further to deduce total ionization cross-section, using the 'complex scattering potential-ionization contribution' (CSP-ic) method of electron-atom/molecule scattering. The present range of positron energy is 15-2000 eV. All the resulting cross-sections are in a good general accord with the existing data. This work highlights the importance of various scattering channels in e + -N 2 and e + -CO interactions at intermediate and high energies.

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Section: Theorymentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

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Total and ionization cross-sections of N2 and CO by positron impact: Theoretical investigations

Kothari

Joshipura

2011

Pramana - J Phys

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“…The total cross sections such as the total elastic (Q el ) and the total inelastic cross sections (Q inel ) can be derived from the scattering matrix [29]. The sum of these cross sections will then give the total scattering cross section (TCS) Q T [30].…”

Section: High-energy Formalismmentioning

confidence: 99%

“…High-energy electron scattering is modeled using the well-established SCOP formalism [29,30], which employs a partial-wave analysis to solve the Schrödinger equation with various model potentials as its input. The interaction of the incoming electron with the target molecule can be represented by a complex potential comprising real (V R ) and imaginary parts (V I ) as…”

Section: High-energy Formalismmentioning

confidence: 99%

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

Vinodkumar¹,

Limbachiya²,

Barot³

et al. 2013

Phys. Rev. A

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Theoretical rotationally elastic total cross sections for electron scattering from methanol over the incident energy range 0.1-2000 eV are presented. The computation of such cross sections for methanol is reported over such an extended energy range. We have employed two distinct formalisms to compute the cross sections across this energy range; between 0.1 eV and the ionization threshold of the target we have used the ab initio R-matrix method, while at higher energies the spherical complex optical potential method is invoked. The results from both formalisms match quite well at energies where they overlap and hence imply that they are consistent with each other. These total cross-section results are also in very good agreement with available experimental data and earlier theoretical data. The composite methodology employed here is well established and can be used to predict cross sections for other targets where data is scarce or not available.

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Theoretical study of positron scattering by group 14 tetra hydrides: A quantum mechanical approach

Sinha

Singh

Antony

2018

Int J of Quantum Chemistry

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The present work provides a comprehensive set of positron impact scattering cross sections for group 14 tetrahydrides, namely, SiH4, GeH4, SnH4, and PbH4. The well‐established spherical complex optical potential and complex scattering potential‐ionization contribution methods are modified to incorporate positron scattering in the present work to calculate various cross sections. The positronium formation channel is adequately included through an improved inelastic threshold. The energy range chosen for the direct ionization cross section is from the respective ionization potential (I) of the molecule to 5 keV. Likewise, positronium formation and total ionization cross sections are reported from the positronium formation threshold to 300 eV and 5 keV, respectively, and the total cross section is computed for an extensive energy range of 1 eV to 5 keV. The positron impact total cross section for stannane molecule is computed for the first time. A characteristic valley is observed in the total cross sections with minima close to the positronium formation threshold. Further increase of cross section signifies the opening of inelastic channels especially positronium formation. In general, a reasonable agreement is found between the present results and other comparisons, wherever available. Furthermore, this is the first report of the inelastic cross sections (direct ionization, positronium formation, and total ionization) for the present set of targets.

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Calculated total cross sections of electron-impact ionization and excitations in tetrahedral(XY4)andSF

Cited by 114 publications

References 28 publications

Total and ionization cross-sections of N2 and CO by positron impact: Theoretical investigations

Total and ionization cross-sections of N2 and CO by positron impact: Theoretical investigations

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

Theoretical study of positron scattering by group 14 tetra hydrides: A quantum mechanical approach

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