• P-ISSN 0974-6846 E-ISSN 0974-5645

Indian Journal of Science and Technology

Article

Indian Journal of Science and Technology

Year: 2021, Volume: 14, Issue: 2, Pages: 170-180

Original Article

Electron impact ionization cross-sections of Chromium

Received Date:02 November 2020, Accepted Date:26 December 2020, Published Date:21 January 2021

Abstract

Abstract:The theoretical model, developed by S.P. Khare, has been modified to evaluate the total cross sections for ionization of Chromium atom due to electron impact at incident electron energy from ionization threshold to 6000 eV. The various calculated cross sections are in remarkable agreement with available experimental data and other theoretical cross sections. For Chromium atom, good agreement between theory and experiment is achieved. Objective: Our objective is to find the partial and total ionization cross sections for Chromium atom and its fragmentation ion at different energy levels and interpretation of results with other available data. Method:-The theoretical semi-empirical model, developed by S.P. Khare, has been remodeling to evaluate the total cross sections for ionization of Chromium atom due to electron impact at incident electron energy from ionization threshold to 6000eV. Findings: A good agreement is observed when we compared our data for electron impact ionization cross section for Cr6+, Cr7+, Cr8+ and Cr10+ fragment ions. Also some disagreement is found between our data and other available data. Our results are higher for Cr7+, Cr8+ fragment ions. For Chromium atom, good agreement between theory and experiment is achieved. Novelty: Electron impact ionization is engaged to produce positive and negative ions in many areas of physics and chemistry such as plasma studies, fusion modeling, radiation physics and gas discharges to more abstract applications such as astrophysical applications and modeling of planetary atmospheres.

Keywords: cross- section; impact; spectroscopy

References

  1. Bohr N. I. On the constitution of atoms and molecules. The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science. 1913;26:1–25. Available from: https://dx.doi.org/10.1080/14786441308634955
  2. Mott NF, Massey HSW. Theory of Atomic Collisions (3). Oxford University Press. 1965.
  3. Kumar Y, Tiwari N, Kumar M, Tomar S. K-shell ionization cross sections of transition and non metals by electron impacts. J. At. Mol. Sci.. 2012;3(2):122–135. Available from: https://www.global-sci.org/v1/jams/open-access/v3n2/pdf/032-122.pdf
  4. Crandall DH, Phaneuf RA, Falk RA, Belic DS, Dunn GH. Absolute cross-section measurements for electron-impact ionization of Na-like ions—Mg+,Al2+, andSi3+. Physical Review A. 1982;25(1):143–153. Available from: https://dx.doi.org/10.1103/physreva.25.143
  5. Bhardwaj A. On the Solar EUV Deposition in the Inner Comae of Comets with Large Gas Production Rates. Geophysical Research Letters. 2003;30(24):2244–2248. Available from: https://dx.doi.org/10.1029/2003gl018495
  6. Jain DK, Khare SP. Ionizing collisions of electrons with CO2, CO, H2O, CH4and NH3. Journal of Physics B: Atomic and Molecular Physics. 1976;9(8):1429–1438. Available from: https://dx.doi.org/10.1088/0022-3700/9/8/023
  7. Kim YK, Rudd ME. Binary-encounter-dipole model for electron-impact ionization. Physical Review A. 1994;50(5):3954–3967. Available from: https://dx.doi.org/10.1103/physreva.50.3954
  8. Deutsch H, Becker K, Matt S, Märk TD. Theoretical determination of absolute electron-impact ionization cross sections of molecules. International Journal of Mass Spectrometry. 2000;197(1-3):37–69. Available from: https://dx.doi.org/10.1016/s1387-3806(99)00257-2
  9. Zecca A, Karwasz GP, Brusa RS. One century of experiments on electron-atom and molecule scattering: A critical review of integral cross-sections. La Rivista del Nuovo Cimento. 1996;19(3):1–146. Available from: https://dx.doi.org/10.1007/bf02742990
  10. Kim YK, Stone PM. Ionization of silicon, germanium, tin and lead by electron impact. Journal of Physics B: Atomic, Molecular and Optical Physics. 2007;40(8):1597–1611. Available from: https://dx.doi.org/10.1088/0953-4075/40/8/011
  11. NFM. The collision between two electrons. In: Proc. R. Soc. A, 801. (Vol. 126, pp. 259-267) Royal Society. 1930.
  12. Bethe H. Zur Theorie des Durchgangs schneller Korpuskularstrahlen durch Materie. Annalen Phys. . 1930;397(3):325–400.
  13. Man KF, Smith ACH, Harrison MFA. A measurement of the cross section for ionisation of Cr+by electron impact. Journal of Physics B: Atomic and Molecular Physics. 1987;20(11):2571–2578. Available from: https://dx.doi.org/10.1088/0022-3700/20/11/024
  14. Llovet X, Merlet C, Salvat F. Measurements of K-shell ionization cross sections of Cr, Ni and Cu by impact of 6.5-40 keV electrons. Journal of Physics B: Atomic, Molecular and Optical Physics. 2000;33(18):3761–3772. Available from: https://dx.doi.org/10.1088/0953-4075/33/18/323
  15. Sataka M, Ohtani S, Swenson D, Gregory DC. Experimental cross sections for electron-impact ionization of chromium ions:Cr6+,Cr7+,Cr8+, andCr10+. Physical Review A. 1989;39(5):2397–2403. Available from: https://dx.doi.org/10.1103/physreva.39.2397
  16. McGuire EJ. Electron ionization cross sections in the Born approximation. Physical Review A. 1977;16(1):62–72. Available from: https://dx.doi.org/10.1103/physreva.16.62
  17. Kaur J, Gupta D, Naghma R, et al. Electron impact ionization cross sections of atoms. Journal of Physics. 2014;93(6). Available from: https://doi.org/10.1139/cjp-2014-0485

Copyright

© 2021 Bhatt & Kumar.This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Published By Indian Society for Education and Environment (iSee)

DON'T MISS OUT!

Subscribe now for latest articles and news.