Positron total cross sections for collisions with O
 2
 , H
 2
 O and CH
 4
 in energy range from 30 to 3000eV

施德恒,; 刘玉芳,; 孙金锋,; 朱遵略,; 杨向东,

doi:10.1088/1009-1963/14/5/018

Cited by 10 publications

(8 citation statements)

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“…The present cross section curve is almost matching with the cross section curve of Reid and Wadhera 12 . The present result alsogoes very well with the theoretical 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 values of De-Heng et al 26 and 10% respectively lower than the present calculated data. The measured values of Coleman et al 6 are quite low as compared to present data and with previous comparisons.…”

Section: Resultssupporting

confidence: 89%

“…Chiari et al 9 There are several studies reported fore + -N 2 scatteringin the literature [12][13][14][15][16][17][18][19][20][21][22][23] . Similarly for O 2 , there exist previous experimental results from Marler et al 5 , Katayama et al 24 and Dababneh et al 25 and theoretical results from De-Heng et al 26 and Raj 27 . Thus, it is quite evident that N2and…”

Section: Introductionmentioning

confidence: 58%

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Theoretical Formalism To Estimate the Positron Scattering Cross Section

et al. 2016

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A theoretical formalism is introduced in this article to calculate the total cross sections for positron scattering. This method incorporates positron-target interaction in the spherical complex optical potential formalism. The study of positron collision has been quite subtle until now. However, recently, it has emerged as an interesting area due to its role in atomic and molecular structure physics, astrophysics, and medicine. With the present method, the total cross sections for simple atoms C, N, and O and their diatomic molecules C2, N2, and O2 are obtained and compared with existing data. The total cross section obtained in the present work gives a more consistent shape and magnitude than existing theories. The characteristic dip below 10 eV is identified due to the positronium formation. The deviation of the present cross section with measurements at energies below 10 eV is attributed to the neglect of forward angle-discrimination effects in experiments, the inefficiency of additivity rule for molecules, empirical treatment of positronium formation, and the neglect of annihilation reactions. In spite of these deficiencies, the present results show consistent behavior and reasonable agreement with previous data, wherever available. Besides, this is the first computational model to report positron scattering cross sections over the energy range from 1 to 5000 eV.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 58%

Theoretical Formalism To Estimate the Positron Scattering Cross Section

et al. 2016

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“… Total cross section for e + H 2 O interaction. Solid line: present result, dash dotted line: Baluja and Jain, short dashed line: De‐Heng etal ., dotted line: De‐Heng et al . (modified), dash dot dotted line: Chen et al ., dashed line: Aouchiche et al ., short dotted line: Blanco et al …”

Section: Resultsmentioning

confidence: 72%

Positron Scattering: Total Elastic and Grand Total Cross Sections for Molecules of Astrophysical Importance

2019

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Spherical complex optical potential (SCOP) method, appropriately modified by our group for positron scattering, is employed to compute total elastic and grand total cross sections for astrophysical molecules. The cross sections for the present targets, viz. H2O, NH3, HCl, OCS and SO2 are reported for a wide energy range, spanning from 1 eV to 5000 eV. The elastic cross sections for HCl and OCS are reported for the first time. In the intermediate to high energy regime, results of most of the targets studied compare fairly well with the recent measurements, wherever available. Present cross sections would be useful for modelling astrophysical systems.

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“…The first theoretical investigation on positron-O 2 scattering appears to be that of Baluja and Jain [17], who calculated the TCS in the energy range between 10 and 5000 eV with a local spherical complex optical potential. Subsequent computational studies of the TCS for this system include those by Raj [18], Reid and Wadehra [19] and De-Heng et al [20]. Those calculations were all based on the additivity rule (AR), although they employed somewhat different versions of this approach.…”

Section: Introductionmentioning

confidence: 99%

Positron scattering from O₂

Chiari

Zecca

Girardi

et al. 2012

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

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We report on recent cross section results for positron scattering from molecular oxygen (O2). Total cross sections (TCSs) were measured with a positron spectrometer in the energy range from 0.1 to 50 eV and with an energy resolution of the positron beam of ∼0.25 eV. In addition, TCSs as well as elastic and inelastic integral cross sections were computed within the independent atom model and screening corrected additivity rule approach, with both dipole and dipole plus quadrupole polarization potentials, between 1 and 1000 eV impact energy. An overall fair level of accord is found between the experimental TCS and that calculated with the model that includes the quadrupole term. Comparison to earlier measurements shows very good agreement with the present measured TCS and fair agreement with the TCS computed with our most physical model above ∼8 eV. Conversely, we find only a marginal level of accord when comparing our experimental TCS with previous computations, while the present TCS calculated with the dipole plus quadrupole potentials appears to agree reasonably well with most of the existing theoretical results above ∼100 eV.

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Positron total cross sections for collisions with O ₂ , H ₂ O and CH ₄ in energy range from 30 to 3000eV

Cited by 10 publications

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Theoretical Formalism To Estimate the Positron Scattering Cross Section

Theoretical Formalism To Estimate the Positron Scattering Cross Section

Positron Scattering: Total Elastic and Grand Total Cross Sections for Molecules of Astrophysical Importance

Positron scattering from O₂

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Positron total cross sections for collisions with O 2 , H 2 O and CH 4 in energy range from 30 to 3000eV

Cited by 10 publications

References 0 publications

Theoretical Formalism To Estimate the Positron Scattering Cross Section

Theoretical Formalism To Estimate the Positron Scattering Cross Section

Positron Scattering: Total Elastic and Grand Total Cross Sections for Molecules of Astrophysical Importance

Positron scattering from O2

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Positron total cross sections for collisions with O ₂ , H ₂ O and CH ₄ in energy range from 30 to 3000eV

Positron scattering from O₂