Exchange effects in atomic K-shell ionisation have been re-examined. A modified form of the Ochkur approximation (1964) for the exchange amplitude is suggested. This is suitable for application to the calculation of doubly differential cross sections (d sigma /dE1 d Omega 1).

J N DAS

University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

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The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

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It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

Exchange effects in atomic K-shell ionisation

Journal of Physics B: Atomic, Molecular and Optical Physics

Inner-shell ionization cross sections of silver and gold have been calculated from a result which uses the relativistic Sommerfeld-Maue wavefunction for the ejected electron. The results have been compared with the results of Das (see ibid., vol.7, 923 (1974)), which use the non-relativistic Coulomb wavefunction for the ejected electron. The comparison shows that there is only a few percent lowering in total cross section under these improved calculations and the overall trend of the curves for total cross section and the conclusion of Das are maintained.

Journal of Physics B: Atomic and Molecular Physics

Inner-shell ionization cross sections when the Sommerfeld-Maue wavefunction is used

Physical Review A

K- andL-shell ionization of atoms by relativistic electrons

Atomic Inner-Shell Processes

Theory of Charged-Particle Excitation

Physical Review Letters

Differential Cross Section for K-Shell Ionization of Copper and Silver by Electron Bombardment

Solar Physics

Abstracts of forthcoming papers

Journal	Journal of Physics B: Atomic, Molecular and Optical Physics
Publisher	-
ISSN	0953-4075