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Analytical Absorption Cross-Section for Photon by a Hydrogen 2s Atom

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dc.contributor.author Boniface Otieno Ndinya, Stephen Onyango Okeyo
dc.date.accessioned 2020-12-07T10:04:49Z
dc.date.available 2020-12-07T10:04:49Z
dc.date.issued 2011-04
dc.identifier.uri https://repository.maseno.ac.ke/handle/123456789/3327
dc.description.abstract We calculate the absorption cross-section for photon by a hydrogen 2s atom using the quantum-classical approximation for the total photo cross-section of many electron atoms. With the application of the first-order term of the Baker—Hausdorf expansion, the absorption cross-section for the hydrogen 2s atom decreases to a minimum, the Cooper pair minimum, at low photon energy. Such a minimum is absent in the exact absorption cross-section for photon by a hydrogen 2s atom. We have extended the calculation for the absorption cross-section of the hydrogen 2s atom using the quantum-classical approximation for the total photo cross-section of many electron to include the second-order term of the Baker—Hausdorf expansion and observed a great reduction in the dip associated with the Cooper pair minimum at the zero crossing. en_US
dc.publisher IOP Publishing en_US
dc.subject absorption cross-section, Cooper pair minimum and Baker–Hausdorf expansion en_US
dc.title Analytical Absorption Cross-Section for Photon by a Hydrogen 2s Atom en_US
dc.type Article en_US


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