Positron impact ionization of molecular nitrogen

Câmpeanu, R.I.; Chiş, Vasile; Nagy, L.; Stauffer, A D

doi:10.1016/j.nimb.2004.03.025

Cited by 18 publications

(8 citation statements)

References 13 publications

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“…Although their results are similar to the present case, the present study incorporates the absorption channels more efficiently as evident from the results obtained for Q ps . The theoretical curve of Campeanu et al [38] neither agrees much with the present data nor the experiments. However, their curve intersects the present curve at the peak and also at around 400 eV.…”

Section: Direct Ionization Cross-sectioncontrasting

confidence: 87%

“…Table 1 enumerates the values of target parameters used in the present calculation. [37]; dash-dotted line: Campeanu et al [38]; solid circles: Marler and Surko [12]; asterisks: Bluhme et al [39]. (c) Dash-dotted line: Campeanu et al [40]; solid circles: Marler and Surko [12]; solid stars: Katayama et al [41].…”

Section: Calculation Of Positronium Formation Cross-section (Q Ps )mentioning

confidence: 99%

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Positronium formation and ionization of atoms and diatomic molecules by positron impact

Singh¹,

Antony²

2017

EPL

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In this article, we aim to calculate positronium formation and ionization cross-sections (direct and total) for C, N and O atoms and their diatomic molecules. A modified version of the well-known SCOP (Spherical Complex Optical Potential) and CSP-ic (Complex Scattering Potential-ionization contribution) formalisms are used for this calculation. In the present study, a phenomenological model recently introduced to obtain the threshold for absorption is used with a slight modification which helped us to distinguish various inelastic channels. This phenomenological model has improved our results, which are found to be in a reasonable agreement with the existing measurements. Most of the results predicted in this article are reported for the first time, hence more experiments are needed to be done to validate the present findings.

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Section: Direct Ionization Cross-sectioncontrasting

confidence: 87%

Section: Calculation Of Positronium Formation Cross-section (Q Ps )mentioning

confidence: 99%

Positronium formation and ionization of atoms and diatomic molecules by positron impact

Singh¹,

Antony²

2017

EPL

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“…For example, in fully kinematic studies the binary electron emission (resulting from 2-body interactions involving just the incoming projectile and a single target electron with the other bound electrons and target nucleus acting as non participating spectators) was predicted to be enhanced (reduced) for positron (electron) impact; while just the opposite was predicted for the recoil intensity (corresponding to interactions where the ejected electron also interacts with the target nucleus as it leaves). The directions of the binary and recoil lobes were also predicted to have opposite shifts with respect to the momentum transfer direction [5][6][7][8][9]. Many theoretical studies performed since then arrive at similar predictions.…”

Section: Introductionmentioning

confidence: 75%

“…One particular interest in comparing positron and electron impact data are differences in the interaction kinematics associated solely with the opposite projectile charges. These differences provide stringent tests of theory because first-order perturbation theories predict identical total and differential cross sections for higher energy electron and positron impact whereas more sophisticated approximations developed in the 1980's and 90's predicted differences in the differential electron emission measured as a function of the momentum transfer [2][3][4][5][6][7][8][9][10][11][12][13]. For example, in fully kinematic studies the binary electron emission (resulting from 2-body interactions involving just the incoming projectile and a single target electron with the other bound electrons and target nucleus acting as non participating spectators) was predicted to be enhanced (reduced) for positron (electron) impact; while just the opposite was predicted for the recoil intensity (corresponding to interactions where the ejected electron also interacts with the target nucleus as it leaves).…”

Section: Introductionmentioning

confidence: 99%

Differential studies and projectile charge effects in ionization of molecular nitrogen by positron and electron impact

Lucio

DuBois

2016

Phys. Rev. A

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Singly, doubly and triply differential information, obtained from coincidence measurements, are presented for 250 eV positron and electron impact ionization of molecular nitrogen. Comparisons of these data as functions of energy loss, scattering, and emission angles illustrate differences associated with the sign of the projectile charge. Via a deconvolution and normalization procedure, the triply differential data are converted to absolute cross sections. By fitting the triply differential cross sections for single ionization with simple functions, the intensities, directions, and peak to background intensities of the binary peaks, plus the ratio of recoil to binary interactions, are compared for positron and electron impact. Formulae for the binary and recoil intensities plus for the orientation of the binary peak as a function of momentum transfer are extracted from the data. Differences in the relative amount of fragmentation as a function of energy loss are also observed.

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“…for the positron [48] and electron impact [49] ionization of N 2 molecule in the distorted wave Born approximation (DWBA) approach and reasonable degree of agreement has been obtained with the measurements.…”

Section: Introductionmentioning

confidence: 53%

Projectile charge effects on the differential cross sections for the ionization of molecular nitrogen by positrons and electrons

Purohit

Kato

2018

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

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Triply differential cross sections (TDCS) are reported for the positron and electron impact ionization of molecular nitrogen at 250 eV projectile energy. The TDCSs have been calculated in the distorted wave Born approximation formalism using the orientation averaged molecular orbitals. The present attempt is helpful to analyze the recent measurements [Phys. Rev. A 93, 032710 (2016)] and study the effect of projectile charge in the ionization of molecular target.The TDCS trends are compared for the positron and electron impact ionization in terms of binary and recoil intensities, binary lobe positions for different values of energy loss. The binary emission of electron is enhanced for positron impact however the nearly same recoil emission is observed for positron as well as electron impact. Significant discrepancies are observed from the measurements in terms of relative binary intensity for positron and electron impact.

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Positron impact ionization of molecular nitrogen

Cited by 18 publications

References 13 publications

Positronium formation and ionization of atoms and diatomic molecules by positron impact

Positronium formation and ionization of atoms and diatomic molecules by positron impact

Differential studies and projectile charge effects in ionization of molecular nitrogen by positron and electron impact

Projectile charge effects on the differential cross sections for the ionization of molecular nitrogen by positrons and electrons

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