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Positron-induced scattering from pentane isomers beyond ionization threshold

  • Regular Article - Atomic and Molecular Collisions
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Abstract

The binary encounter Bethe model (BEB) for positron is invoked to obtain the positron impact direct ionization cross sections for pentane isomers from ionization threshold to 5000 eV. The BEB results are compared with the theoretical results, and the agreement is found to be good. The elastic cross sections (ECS) are obtained using the single-center expansion (SCE) approach. The incoherently summed elastic and direct ionization cross sections are in an excellent agreement with the experimentally measured total cross sections (TCS) from 40 eV onwards. The cross sections for a particular type of a process were similar for all the isomers, thus indicating absence of isomerism in positron impact scattering. The differences in the magnitude of the differential cross sections (DCS) of the three isomers were small. But the isomer effect could be assessed by the contribution of different partial waves in the DCS, where for neo-pentane the oscillatory pattern differs from the n-pentane and iso-pentane. We have also compared the electron and positron BEB ionization cross sections. Beyond 500 eV, cross sections from both the projectiles show merging trends.

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Data availability statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: There is no data associated with the present work. However, the numeric values of the graphs are available on request.]

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Acknowledgements

The authors VS and AB are thankful to College authorities for providing necessary facilities to carry out the present study. The authors are also grateful to the Department of Biotechnology, Government of India, for motivating the students to take up research activities under Star College Scheme. VS is also thankful to Nidhi Sinha for providing the numerical data of her published results.

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Authors and Affiliations

  1. Department of Physics, Keshav Mahavidyalaya, (University of Delhi), Delhi, 110034, India

    Ajay Kumar Arora

  2. Department of Physics, Bhaskaracharya College of Applied Sciences, (University of Delhi), New Delhi, 110007, India

    Vardaan Sahgal & Anand Bharadvaja

  3. Department of Physics, Ramjas College, (University of Delhi), Delhi, 110007, India

    Krishna Kumar Gupta

  4. formerly at Department of Physics and Astrophysics, (University of Delhi), Delhi, 110007, India

    Kasturi Lal Baluja

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  1. Ajay Kumar Arora
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All authors are equally involved in the present work.

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Correspondence to Anand Bharadvaja.

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A. K. Arora: On leave.

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Arora, A.K., Sahgal, V., Gupta, K.K. et al. Positron-induced scattering from pentane isomers beyond ionization threshold. Eur. Phys. J. D 75, 259 (2021). https://doi.org/10.1140/epjd/s10053-021-00273-7

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