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 |