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dc.creatorNahar, Sultana N.en_US
dc.creatorPalay, Ethanen_US
dc.creatorPradhan, Anil K.en_US
dc.date.accessioned2013-07-16T21:43:18Z
dc.date.available2013-07-16T21:43:18Z
dc.date.issued2013en_US
dc.identifier2013-WF-07en_US
dc.identifier.urihttp://hdl.handle.net/1811/55473
dc.descriptionAuthor Institution: Department of Astronomy; The Ohio State University, Columbus, OH 43210en_US
dc.description.abstract%TEXT OF YOUR ABSTRACT The inverse processes of photoionization and electron-ion recombination are dominant in photoionized astrophysical plasmas. They determine the ionization fractions in photoionization equilibrium, physical conditions, and chemical abundances. We employ the unified theory of electron-ion recombination to study photoionization of Ne~IV in photoionized nebulae. That leads to the production of Ne~V and spectral emission of forbidden optical and mid-infrared [Ne~V] lines via collisional excitation. These lines are prominent in the observations made by infrared space observatories SPITZER, SOFIA, and HERSCHEL. The unified method for electronic recombination provides self-consistent data for photoionization and recombination that is necessary to eliminate uncertainties in the determination of ionization fractions. To wit: Precise abundance of neon in the Sun is unknown owing to lack of accurate atomic data. A 20-level wave function expansion is used for the calculations of photoionization, recombination, and collisional excitation employing the relativistic Breit-Pauli R-matrix method in the close coupling approximation. We find and delineate extensive resonance structures at low energies that considerably enhance the effective cross sections and rates in astrophysical sources.en_US
dc.language.isoenen_US
dc.publisherOhio State Universityen_US
dc.titlePHOTOIONIZATION AND RECOMBINATION OF Ne IV AND EXCITATION OF NeV IN NEBULAR PLASMASen_US
dc.typeArticleen_US
dc.typeImageen_US
dc.typePresentationen_US


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